M. I. Arriortua

Universidad del País Vasco / Euskal Herriko Unibertsitatea, Leioa, Basque Country, Spain

Are you M. I. Arriortua?

Claim your profile

Publications (316)581.19 Total impact

  • Source
    Dataset: Revised ESI
  • Source
  • [show abstract] [hide abstract]
    ABSTRACT: The 3D crystal structure of {Ni2(H2O)2(Bpa)2}(V6O17) (NiBpaRT), were Bpa is 1,2-bis(4-pyridil)ethane, was determined by single crystal X-ray diffraction. The crystal structure is constructed from {Ni(H2O)(Bpa)} metal−organic and (V3O8.5) vanadate chains. The connectivity of these one-dimensional units generates a three-dimensional inorganic substructure, and also a threedimensional inorganic−organic framework. The symmetric unit contains two crystallographically pseudoequivalent vanadate and metal−organic chains. The tacking of these crystallographically pseudoequivalent units seems to be nearly related to the twinning law of the crystals, and with the diffuse scattering observed in the diffraction pictures. Several models of local disorders for the packing of these one-dimensional units have been proposed to explain the origin of the diffuse scattering observed in the diffraction images. The obtained single crystals are systematically twinned. The origin of this twining is clearly related to the packing of the crystallographically independent chains along the [100] direction. The topology of the crystal structure is a new self-catenated three nodal net. The simplified structure can be described also as the natural tiling of two different tiles. NiBpaRT shows a reversible solid state transformation due to the loss of coordinated water molecules at 180 °C. The high temperature compound, {Ni2(Bpa)2}(V6O17) (NiBpaHT), maintains the crystallinity, but the solid state transformation involves a single crystal to polycrystalline reaction. So, the determination of the high temperature structure have been carried out by rigid body Rietveld refinement of the room temperature crystal structure, from synchrotron X-ray diffraction radiation. The loss of coordinated water molecules of the nickel cations is compensated by the incorporation of the terminal oxygen atoms, belonging to the adjacent VO4 tetrahedra, into the coordination environment of the nickel cations. We have referred to this mechanism of reorganization of the structural units as padlock solid state transformation. The UV−vis spectra corroborate the presence of octahedrally coordinated nickel cations in the high temperature crystal structure. The IR and Raman spectra show strong changes in the absorption maxima related to the stretching vibration of VO terminal bonds, in good agreement with the proposed padlock mechanism. The dimeric ferromagnetic coupling of the nickel cations through the VO4 tetrahedra is similar for NiBpaRT and NiBpaHT, showing also an antiferromagnetic coupling at low temperatures. However, the distortion of the nickel coordination environment during the transformation implies an important difference in the g values for NiBpaRT and NiBpaHT.
    Crystal Growth & Design 01/2014; 14:658−670. · 4.69 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: The electrochemical performance of [{Mn(Bpy)}(VO3)2]≈(H2O)1.16 and [{Mn(Bpy)0.5}(VO3)2]≈(H2O)0.62 against sodium and lithium counter electrodes give rise to the structural collapse of the initial compounds. The IR and Raman studies show that the Bpy organic ligand is completely decomposed during the during the electrochemical testing. However, after the amorphization stable capacities as high as 850 mAh/g for lithium cells were achieved.
    Journal of Solid State Chemistry. 01/2014; 212:92–98.
  • Source
    Dataset: supmat
  • [show abstract] [hide abstract]
    ABSTRACT: M2(SeO3)F2 (M = Zn (), Mn ()) stoichiometric phases together with the Zn2-xMnx(SeO3)F2 compound doped at various concentrations (x = 0.002-0.2) were synthesized by employing mild hydrothermal conditions. These compounds have been characterized by scanning electron microscopy (SEM), Rietveld refinement of the X-ray powder diffraction patterns, ICP-Q-MS, thermogravimetric and thermodiffractometric analyses, and IR, UV/vis and electron paramagnetic resonance (EPR) spectroscopies. Compounds and crystallize in the orthorhombic Pnma space group with lattice parameters: a = 7.27903(4), b = 10.05232(6) and c = 5.26954(3) Å for the zinc species and a = 7.50848(9), b = 10.3501(12) and c = 5.47697(6) Å for the manganese phase, with Z = 4. The crystal structures of these compounds are isotypic and are built up from a 3D framework constructed by (010) sheets of [MO3F3] octahedra linked up by [SeO3] building units. Luminescence measurements of Mn2(SeO3)F2 were performed at different temperatures between 10 and 150 K. At 10 K, the emission spectrum consists of a broad band peaked at around 660 nm related to the (4)T1g → (6)A1g transition in octahedrically coordinated Mn(2+). Moreover, the influence of temperatures up to 295 K and the Mn concentration on the luminescent properties of the Zn2-xMnx(SeO3)F2 system were systematically studied. Magnetic measurements of show antiferromagnetic coupling as the major interactions exhibiting a spin canting at low temperature.
    Dalton Transactions 07/2013; · 3.81 Impact Factor
  • Source
    [show abstract] [hide abstract]
    ABSTRACT: Compound ([FeTPPbipy](•))n (TPP = meso-tetraphenylporphyrin and bipy = 4,4'-bipyridine) is the first example of a Fe-TPP-bipy coordination network, and it consists of 1D polymers packed through face-to-face and edge-to-face π-π interactions. The compound has been investigated by means of X-ray diffraction, IR, Mössbauer, UV-visible, and EPR spectroscopies, thermogravimetry, magnetic susceptibility measurements, and quantum-mechanical density functional theory (DFT) and time-dependent DFT calculations. The chemical formula for this compound can be confusing because it is compatible with Fe(II) and TPP(2-) anions. However, the spectroscopic and magnetic properties of this compound are consistent with the presence of low-spin Fe(III) ions and [FeTPPbipy](•) neutral radicals. These radicals are proposed to be formed by the reduction of metalloporphyrin, and the quantum-mechanical calculations are consistent with the fact that the acquired electrons are located on the phenyl groups of TPP.
    Inorganic Chemistry 06/2013; · 4.59 Impact Factor
  • Source
    [show abstract] [hide abstract]
    ABSTRACT: Two new CoP–bipy compounds have been synthesised and characterised, where P is TPP for compound 1 (TPP = meso-tetraphenylporphyrin) and TPPS for compound 2 (TPPS = meso-tetraphenylporphine-tetrasulfonic acid tetrasodium salt), and bipy is 4,4′-bipyridine. Compound 1 consists of 1D polymers packed in a network where isolated porphyrin units are immobilized by an extended π-bond system. On the other hand, as we are aware, compound 2 is the first Co–TPPS compound in literature. It also consists of 1D polymers that are formed by the alternation of two distinct metal centres. These unprecedented polymers are packed forming cavities where crystallization molecules of water are located. The robustness of the hydrogen bond system and a topology based on interpenetrated nets are responsible for the high thermal stability of compound 2. Additionally, a crystallochemical study confirmed the existence of a correlation between the degree of ruffled distortion of the porphyrin macrocycle and some selected dihedral angles and distances for CoII porphyrins in literature.
    CrystEngComm 04/2013; 15(20):4181-4188. · 3.88 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: Four isomorphic compounds with formula [{Co(HO)(Bpe)}(VO)]·4HO·Bpe, CoBpe 1; [{CoNi(HO)(Bpe)}(VO)]·4HO·Bpe, CoNiBpe 2; [{CoNi(HO)(Bpe)}(VO)]·4HO·Bpe, NiCoBpe 3; and [{Ni(HO)(Bpe)}(VO)]·4HO·Bpe, NiBpe 4, have been obtained by hydrothermal synthesis. The crystal structures of CoBpe 1 and NiBpe 4 were determined by single-crystal X-ray diffraction (XRD). The Rietveld refinement of CoNiBpe 2 and NiCoBpe 3 XRD patterns confirms that those are isomorphic. The compounds crystallize in the P1̅ space group, exhibiting a crystal structure constructed from inorganic layers pillared by Bpe ligands. The crystal structure contains intralayer and interlayer channels, in which the crystallization water molecules and Bpe guest molecules, respectively, are located. The solvent molecules establish a hydrogen bonding network with the coordinated water molecules. Thermodiffractometric and thermogravimetric studies showed that the loss of crystallization and coordinated water molecules takes place at different temperatures, giving rise to crystal structure transformations that involve important reduction of the interlayer distance, and strong reduction of crystallinity. The IR, Raman, and UV-vis spectra of the as-synthesized and heated compounds confirm that the structural building blocks and octahedral coordination environment of the metal centers are maintained after the structural transformations. The color change and reversibility of the water molecules uptake/removal were tested showing that the initial color is not completely recovered when the compounds are heated at temperatures higher than 200 °C. The thermal evolution of the magnetic susceptibility indicates one-dimensional antiferromagnetic coupling of the metal centers at high temperatures. For NiCoBpe 3 and NiBpe 4 compounds magnetic ordering is established at low temperatures, as can be judged by the maxima observed in the magnetic susceptibilities. CoNiBpe 2 was proved as catalyst being active for cyanosilylation reactions of aldehydes.
    Inorganic Chemistry 03/2013; 52(5):2615-26. · 4.59 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: Four novel amine templated open-framework vanadium(iii) phosphites with the formula (C(5)N(2)H(14))(0.5)[V(H(2)O)(HPO(3))(2)], (C(5)N(2)H(14) = 2-methylpiperazinium), and (L)(4-x)(H(3)O)(x)[V(9)(H(2)O)(6)(HPO(3))(14-y)(HPO(4))(y)(H(2)PO(3))(3-z)(H(2)PO(4))(z)]·nH(2)O (, L = cyclopentylammonium, x = 0, y = 3.5, z = 3, n = 0; , L = cyclohexylammonium, x = 1, y = 0, z = 0.6, n = 2.33; , L = cycloheptylammonium, x = 1, y = 0, z = 0, n = 2.33) were synthesized employing solvothermal reactions and characterized by single-crystal X-ray diffraction, ICP-AES and elemental analyses, thermogravimetric and thermodiffractometric analyses, and IR and UV/vis spectroscopy. Single-crystal data indicate that crystallizes in the triclinic system, space group P1[combining macron], whereas , and crystallize in the hexagonal space group P6(3)/m. Compound has a two-dimensional motif with anionic sheets of [V(H(2)O)(HPO(3))(2)](-) formula, whose charge is compensated by the 2-methylpiperazinium cations embedded between the layers. In contrast, , and present a pillar-layer network giving rise to a three-dimensional framework containing intersecting 16-ring channels with the primary amine templates and the crystallization water molecules enclosed in them. , , and behave as heterogeneous catalysts for the selective oxidation of alkyl aryl sulfides, with tert-butylhydroperoxide (TBHP) as the oxidizing agent, being active, selective and recyclable for several successive cycles of reaction.
    Dalton Transactions 01/2013; · 3.81 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: The three-dimensional Co(pym)(VO(3))(2), , hybrid compound, where pym is pyrimidine, has been synthesized under mild hydrothermal conditions at 120 °C. The compound has been characterized by FT-IR spectroscopy, elemental analysis, thermogravimetric measurements, thermodiffractometry, UV-Vis spectroscopy, temperature-dependent magnetic susceptibility and magnetization, and finally a study of specific heat has been performed. The crystal structure of was solved using single-crystal X-ray diffraction data, taking into account that the crystals of this compound are twins of two components. It crystallizes in the monoclinic system, space group C2/c, a = 12.899(5) Å, b = 9.859(2) Å, c = 7.051(1) Å, β = 111.41(3)°, Z = 4. The crystal structure is built up from edge sharing VO(5) trigonal bipyramid double chains and [CoO(4)pym](n) chains. This resembles the structure of the [Co(H(2)O)(2)(VO(3))(2)]·2H(2)O compound, . For this reason a comparative study of their properties was carried out. Magnetic measurements of , performed in the 2.0 to 300 K range, reveal the existence of a weak ferromagnetic order near 3 K. This fact was confirmed with magnetization measurements, which show irreversibility characteristic of soft ferromagnets. Magnetic measurements of show a 3D antiferromagnetic ordering at 2.5 K. The magnetization shows a small change of curvature indicating the occurrence of a metamagnetic transition. Specific heat measurements of both compounds confirm the 3D nature of the magnetic order. The comparative study of the magneto-structural correlations reveals that the pyrimidine molecules are responsible for the different magnetic behaviour between and .
    Dalton Transactions 10/2012; · 3.81 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: The 3D hybrid compounds {Co(Bpa)}(VO3)2 (1) and [{Ni(H2O)(Bpa)}(VO3)2]·2H2O (2), where Bpa is 1,2-di(4-pyridil)ethane, have been synthesized using mild hydrothermal conditions. The compositional diagrams for the Co(II)/Bpa/VxOy and Ni(II)/Bpa/VxOy systems have been constructed and qualitative crystallization sequences have been proposed. The 3D crystal structures of both compounds are closely related, and are constructed of inorganic layers pillared by the organic ligand. The UV-vis spectra for (1) shows the characteristic bands of the Co(II) d7high-spin cation in a slightly distorted trigonal bipyramid geometry. The thermal behaviour of (1) allows the determination of the expansion coefficients for the cell and angle parameters, which were closely related to the different types of bonds that exist in the crystal structure. The cobalt compound exhibits antiferromagnetic coupling of the cobalt centres within the inorganic layers, probably coupled in dimeric units, as is expected for the different magnetic exchange pathways. For (2), the diffuse scattering is probably related to the motion of the crystallization water molecules, which is observed in the (h0l), (h2l), (hk0) and (hk2) planes.
    CrystEngComm 09/2012; 14(20):6921-6933. · 3.88 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: The hydrothermal treatment of Ni(NO(3))(2)·6H(2)O, NaVO(3), and Bpa (1,2-Di(pyridyl)ethane) (C(12)H(12)N(2)) at 120 °C during 3 days leads to green single crystals of the title compound. The single crystal X-ray diffraction reveals that [{Ni(3)(H(2)O)(3)(Bpa)(4)}(V(6)O(18))]·8H(2)O crystallizes in the monoclinic system, P2(1)/c space group, with a = 13.5536 (2), b = 19.0463 (2), c = 27.7435 (3) Å, β = 112.3880 (10)°, V = 6622(3) Å(3), with R1(obs) = 0.0558, wR2(obs) = 0.1359, for 10278 observed reflections. The complexity of the crystal structure is based on different points, as the existence of: both "gauche" and "trans" conformations of the organic ligand, the [V(12)O(36)](-12) cycles, formed by 12 corner-sharing VO(4) tetrahedra, and, finally, the combination of both three-dimensional metal-organic and inorganic substructures, giving rise to a self-catenated highly connected net. The crystallization water molecules are semi-encapsulated in the channels along the [100] direction, and their loss gives rise to a dynamical and reversible structural contraction. Moreover, after the removal of the crystallization water molecules, the compound exhibits a negative thermal behavior in the 85-155 °C temperature range, and irreversible structural transformation due to the loss of coordinated water molecules up to 200 °C. The IR and UV-vis spectra were determined for the as-synthesized sample, after the removal of crystallization water molecules and after the irreversible transformation due to the loss of coordinated water molecules. The thermal evolution of χ(m) was adjusted to a magnetic model considering an isotropic dimer plus two Ni(II) d(8) isolated octahedra.
    Inorganic Chemistry 02/2012; 51(4):2130-9. · 4.59 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: Three new hybrid vanadates have been synthesized under hydrothermal conditions with the formula M(C(6)H(16)N(3))(2)(VO(3))(4), where M = Co(II), Ni(II) and Cu(II). The structural analyses show that the phases are isostructural and crystallize in the monoclinic space group P2(1)/c. These compounds show a two-dimensional crystal structure, with sheets composed of [VO(3)](n)(n-) chains and metal centres octahedrally coordinated, chelated by two 1-(2-aminoethyl)piperazonium ligands. The thermal study reveals that the copper containing phase is less stable than the cobalt and nickel containing ones. The IR spectra of the three phases are very similar, with little differences in the inorganic bond region of the copper containing phase. The UV-visible spectra show that the cobalt(II) and the nickel(II) are in slightly distorted octahedral environments. The catalytic tests show that the phases act as heterogeneous catalysts for the selective oxidation of alkyl aryl sulfides, with both H(2)O(2) and tert-butylhydroperoxide as oxidizing agents. The influence of the steric hindrance in the kinetic profile has been studied. The catalytic reactions induce the partial amorphization of the phases.
    Dalton Transactions 12/2011; 40(47):12690-8. · 3.81 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: The Mn(2)(HPO(3))F(2) phase has been synthesized as single crystals by using mild hydrothermal conditions. The compound crystallizes in the orthorhombic Pnma space group, with unit cell parameters of a = 7.5607(8), b = 10.2342(7), and c = 5.5156(4) Å, with Z = 4. The crystal structure consists of a three-dimensional framework formed by alternating (010) layers of [MnO(3)F(3)] octahedra linked up by three connected [HPO(3)] tetrahedra. Luminescence measurements were performed at different temperatures between 10 and 150 K. The 10 K emission spectrum of the octahedrally coordinated Mn(II) cation exhibits a broad band centered at around 615 nm corresponding to the (4)T(1) → (6)A(1) transition. In order to explore the effect of the Mn(II) concentration and the possibility of enhancing the luminescence properties of the Mn(II) cation in Mn(2)(HPO(3))F(2), different intermediate composition members of the finite solid solution with the general formula (Mn(x)Zn(1-x))(2)(HPO(3))F(2) were prepared and their luminescent properties studied. The magnetic and specific heat behavior of M(2)(HPO(3))F(2) (M = Mn, Fe) have also been investigated. The compounds exhibit a global antiferromagnetic ordering with a spin canting phenomenon detected at approximately 30 K. The specific heat measurements show sharp λ-type peaks at 29.7 and 33.5 K for manganese and iron compounds, respectively. The total magnetic entropy is consistent with spin S = 5/2 and S = 2 of Mn(II) and Fe(II) cations.
    Inorganic Chemistry 11/2011; 50(24):12463-76. · 4.59 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: The one dimensional {Co(HBpe)2}(V4O12) inorganic–organic compound, where Bpe is 1,2-di(4-pyridyl)ethene (C12H10N2), has been synthesized using mild hydrothermal conditions under autogenous pressure at 120 °C for three days, obtaining single-crystals suitable for X-ray structure determination. The compound crystallizes in the triclinic system, space groupP, with a = 15.4705(3) Å, b = 11.8919(3) Å, c = 7.8490(2) Å, α = 88.252(2)°, β = 95.429(2)° and γ = 92.534(2)° at 100 K. The crystal structure possesses two crystallographically independent units, strong pseudo-symmetry elements, and a unit cell with a possible monoclinic metric at higher temperatures. At low temperature (100–293 K) the crystallographically independent units present perfectly ordered conformers of the HBpe ligand. The thermal evolution of the cell parameters was studied by single X-ray and powder X-ray diffraction, showing a clear anomaly in the 90–165 °C temperature range. The crystal structures determined at different temperatures (100, 293, 438, 503 and 533 K) show that a complete disorder of the HBpe ligand through pedal motion occurs between 90 °C and 165 °C. This dynamical process is completely reversible and gives rise to the P to C order–disorder structural transition. At higher temperatures the crystal structure tends to the monoclinic C2/m symmetric crystal structure, however, the thermal instability disrupts this hypothetical displacive structural transition. To the best of our knowledge this is the second polymeric compound in which the pedal motion has been reported. The spectroscopic and magnetic properties were also determined. The IR-spectrum shows the characteristic bands related to the organic ligand and V4O12 cycles. The thermal evolution of the magnetic susceptibility is related to magnetically isolated Co(II) centers exhibiting the spin–orbit coupling.
    CrystEngComm 10/2011; 13(21):6488-6498. · 3.88 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: Li1.43[FeII4.43FeIII0.57(HPO3)6]·1.5H2O has been synthesized by mild hydrothermal techniques. This phase exhibits a crystal structure formed by the [FeII4.43FeIII0.57(HPO3)6]1.43– inorganic framework with the Li+ cations as counterions. The anionic inorganic skeleton is based on layers of FeO6 octahedra linked along the c-axis through (HPO3)2– oxoanions. The sheets are constructed using 12-membered rings of FeO6 octahedra that repeat in the ab plane, giving rise to channels ca. 3 Å in diameter along the [100] direction in which the water molecules and Li+ cations are located showing positional disorder. The limit of the thermal stability is 285 °C. The IR spectrum shows the vibrational bands belonging to the phosphite groups. From the fit of the Mössbauer spectrum, in the paramagnetic state, characteristic values of the isomer shift and quadrupolar splitting for the simultaneous presence of Fe(II) and (III) cations have been obtained. From the ac-magnetic measurements, spin glass behavior was inferred, which can be attributed to the presence of both Fe(II) (S = 2) and Fe(III) (S = 5/2) cations. The spin-glass-like state was confirmed by specific-heat experiments, with this phase being the first ordered transition-metal phosphite exhibiting this magnetic behavior. The existence of mobile lithium cations in the channels of Li1.43[FeII4.43FeIII0.57(HPO3)6]·1.5H2O was studied by impedance spectroscopy at different temperatures. The obtained Nyquist diagrams reveal two conduction processes. Electrochemical characterization was completed by cyclic voltammetry experiments and galvanostatic measurements. A reversible exchange of lithium is also observed for this compound for more than 100 galvanostatic cycles, equivalent to 12 mAh g–1 of sample.Keywords: hydrothermal synthesis; crystal structure; magnetic measurements; specific heat; electrochemical properties
  • [show abstract] [hide abstract]
    ABSTRACT: Sample of nominal composition La0.6Ca0.4Fe0.8Ni0.2O3 (LCFN) was prepared by liquid mix method. The structure of the polycrystalline powder was analyzed with X-ray powder diffraction data. This compound shows orthorhombic perovskite structure with a space group Pnma. In order to improve the electrochemical performance, Sm-doped ceria (SDC) powder was added to prepare the LCFN–SDC composite cathodes. Electrochemical characteristics of the composites have been investigated for possible application as cathode material for an intermediate-temperature-operating solid oxide fuel cell (IT-SOFC). The polarization resistance was studied using Sm-doped ceria (SDC). Electrochemical impedance spectroscopy measurements of LCFN–SDC/SDC/LCFN–SDC test cell were carried out. These electrochemical experiments were performed at equilibrium from 850 °C to room temperature, under both zero dc current intensity and air. The best value of area-specific resistance (ASR) was for LCFN cathode doped with 10% of SDC (LCFN–SDC9010), 0.13 Ω cm2 at 850 °C. The dc four-probe measurement exhibits a total electrical conductivity over 100 S cm−1 at T ≥ 600 °C for LCFN–SDC9010 composite cathode.
    Journal of Power Sources 05/2011; 196(9):4332–4336. · 4.68 Impact Factor
  • Edurne S. Larrea, José L. Mesa, María I. Arriortua
    [show abstract] [hide abstract]
    ABSTRACT: The three-dimensional hybrid compound Ni3(C4H4N2)3(V8O23) has been synthesized by mild hydrothermal methods under autogenous pressure at 170°C. The structure of the phase is stable until 380°C. The removal of the pyrazine molecules from the structure induces its collapse. The IR spectrum shows the vibration modes of the pyrazine molecule and those of the [VO4]3− groups. A UV–visible spectrum shows the characteristic bands of the Ni(II) d8-high-spin cation in a slightly distorted octahedral coordination. Magnetic measurements indicate the existence of antiferromagnetic interactions that can be fitted with a chain model to give g=2.31, J/k=−5.3, and zJ′/k=−5.5.
    Materials Research Bulletin - MATER RES BULL. 01/2011; 46(6):845-849.
  • [show abstract] [hide abstract]
    ABSTRACT: The creation of porous materials with three-dimensional periodicity has been identified as being of potential interest for increasing the overall performance of solid oxide fuel cells (SOFC). In this work, we have investigated the formation of pore systems in the nanometer scale by replicating colloidal templates. Templating methods have been used to prepare iron–nickel-based perovskite Pr0.7Sr0.3Fe0.8Ni0.2O3 material with nanoporous microstructure. Polymethyl methacrylate (PMMA), polystyrene (PS) and polycarboxylate (PC) microspheres with different diameters were used as pore formers. These samples were synthesized and characterized by thermogravimetric analysis, inductively coupled plasma atomic emission spectroscopy (ICP-AES), X-ray diffraction, transmission electron microscopy and field emission scanning electron microscopy. The polarization resistance of the materials was studied by Electrochemical Impedance Spectroscopy. The study demonstrated that templated porosity is maintained and highly influences on the impedance spectroscopic behaviour, being the material synthesized with policarboxylate microspheres the most interesting of the three used templates for SOFC applications.
    Solid State Ionics 01/2011; 192(1):235-240. · 2.05 Impact Factor

Publication Stats

533 Citations
581.19 Total Impact Points


  • 1986–2014
    • Universidad del País Vasco / Euskal Herriko Unibertsitatea
      • • Mineralogy and Petrology
      • • Facultad de Ciencia y Tecnología
      • • Departamento de Química Inorgánica
      Leioa, Basque Country, Spain
  • 1999–2008
    • Universidad de Burgos
      • Department of Chemistry
      Burgos, Castile and Leon, Spain
  • 2001
    • Universidad Nacional del Litoral
      Ciudad de Santa Fe, Santa Fe, Argentina
  • 1993
    • University of Bordeaux
      Burdeos, Aquitaine, France
  • 1987
    • University of Valencia
      • Inorganic Chemistry
      Valencia, Valencia, Spain