Desheng Fu

Desheng Fu
Shizuoka University · Department of Electronics and Materials Science

Professor

About

146
Publications
16,760
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2,511
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Introduction
Dr. D. FU is a full professor at Department of Electronics and materials Science in Shizuoka University. His group focuses on exploring novel functional oxides such as dielectrics, piezoelectrics, pyroelectric, ferroelectrics, multiferroics, electro-optical materials and ionic conductor and understanding the underlying physics for material design.
Additional affiliations
April 2013 - present
Shizuoka University
Position
  • Professor (Full)
April 2012 - present
Chinese Academy of Sciences
Position
  • Guest Professor
January 2009 - March 2013
Shizuoka University
Position
  • Professor (Associate)

Publications

Publications (146)
Chapter
Full-text available
Combining our comprehensive investigations of polarization evolution, soft-mode by Raman scattering and microstructure by TEM, and the results reported in the literatures, we show that prototypical relaxor Pb(Mg1/3Nb2/3)O3 (PMN) is essentially ferroelectric for T<Tc~225 K. Its anomalous dielectric behavior over a broad temperature range results fro...
Chapter
Full-text available
There are two silver perovskite oxides: AgNbO3 and AgTaO3. AgNbO3 has a noncentrosymmetric group of Pmc21 at room temperature with a ferri-electric ordering of polarization. Such a ferri-electric state with small polarization can be changed into a ferroelectric state with very large polarization by a high electric field or by a chemical modificatio...
Chapter
Full-text available
We here report the substitution effects of the smaller Ca for the bulky Ba in the (Ba1-xCax)(Ti-1-yZry)O3 perovskite oxides for two systems (Ba1-xCax)TiO3 with y=0 and (Ba1-xCax)(Ti0.9Zr0.1)O3 with y=0.1. Ca off-centering was found to play a critical role in stabilizing the ferroelectric phase and tuning the polarization states in both systems. It...
Article
Full-text available
We report the phase diagram of (Ba1-xCax)(Zr0.1Ti0.9)O3 solid solution. It is found that substitution of smaller Ca ions for Ba ions can slightly increase the cubic-tetragonal (T) para-ferroelectric phase transition temperature and strongly decrease the T-orthorhombic (O) and O-rhombohedral (R) transition. This unique ferroelectric phase evolution...
Article
Full-text available
Despite intensive studies on Pb(Mg(1/3)Nb(2/3))O(3) (PMN) relaxor, understanding the exact nature of its giant dielectric response and of its physical ground state is a fundamental issue that has remained unresolved for decades. Here, we report a comprehensive study of PMN relaxor crystal, and show that (i) its anomalous dielectric behavior in a br...
Article
Full-text available
Exploring lead-free candidates and improving efficiency and stability remain the obstacle of hybrid organic-inorganic perovskite-based devices commercialization. Traditional trial-and-error methods seriously restrict the discovery especially for large search space, complex crystal structure and multi-objective properties. Here, the authors propose...
Preprint
Full-text available
CaxBa1-xNb2O6 (CBN) ferroelectric is isostructural with SrxBa1-xNb2O6 (SBN) that is a prototypical ferroelectric of tetragonal tungsten bronze (TTB) structure, but shows a much higher Curie temperature Tc than SBN, providing a wider operation temperature for electro-optical devices. Here, we report the phase diagram and phase transition of CBN soli...
Preprint
Full-text available
In this paper the structural, magnetic, and dielectric properties of langasite compound Pb$_3$TeMn$_3$P$_2$O$_{14}$ have been investigated as a candidate of short-range magnetic correlations driven development of dielectric anomaly above N$\acute{e}$el temperature of ($T_N$=) 7 K. Presence of dielectric anomaly, structural phase transition and a sh...
Article
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A capacitive displacement system was constructed to measure the electric-field-induced piezoelectric strain in the simple form of either a bulk or thin film. The system can determine an AC displacement of 2 pm precisely by using a lock-in detection and can measure the large displacement within the range of ± 25 μ m with a sub-nanometer resolution....
Preprint
Full-text available
A capacitive displacement system was constructed to measure the electric-field-induced piezoelectric strain in the simple form of either a bulk or thin film. The system can determine an AC displacement of 2 pm precisely by using a lock-in detection, and can measure the large displacement within a range of $\pm$ 25 $\mu$m with a sub-nanometer resolu...
Article
In this paper, a comparative structural, dielectric, and magnetic study of two langasite compounds Ba3TeCo3P2O14 (absence of lone pair) and Pb3TeCo3P2O14 (Pb2+ 6s2 lone pair) have been carried out to precisely explore the development of room temperature spontaneous polarization in the presence of a stereochemically active lone pair. In the case of...
Preprint
Full-text available
We have investigated the structural, magnetic and dielectric properties of Pb-based langasite compound Pb$_3$TeMn$_3$P$_2$O$_{14}$ both experimentally and theoretically in the light of metal-oxygen covalency, and the consequent generation of multiferroicity. It is known that large covalency between Pb 6$p$ and O 2$p$ plays instrumental role behind...
Preprint
Full-text available
In this paper a comparative structural, dielectric and magnetic study of two langasite compounds Ba$_3$TeCo$_3$P$_2$O$_{14}$ (absence of lone pair) and Pb$_3$TeCo$_3$P$_2$O$_{14}$ (Pb$^{2+}$ 6$s^2$ lone pair) have been carried out to precisely explore the development of room temperature spontaneous polarization in presence of stereochemically activ...
Preprint
Full-text available
For the first time, the dielectric response of a BaTiO3 thin film under an AC electric field is investigated using time-resolved X-ray absorption spectroscopy at the Ti K-edge to clarify correlated contributions of each constituent atom on the electronic states. Intensities of the pre-edge eg peak and shoulder structure just below the main edge inc...
Article
Full-text available
For the first time, the dielectric response of a BaTiO3 thin film under an AC electric field is investigated using microsecond time-resolved X-ray absorption spectroscopy at the Ti K-edge in order to clarify correlated contributions of each constituent atom on the electronic states. Intensities of the pre-edge eg peak and shoulder structure just be...
Article
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Photo-induced phase transitions (PIPTs) provide an ultrafast, energy-efficient way for precisely manipulating the topological properties of transition-metal ditellurides and can be used to stabilize a topological phase in an otherwise semiconducting material. Using first-principles calculations, we demonstrate that the PIPT in monolayer MoTe2 from...
Article
We have investigated the structural, magnetic, and dielectric properties of the Pb-based langasite compound Pb3TeMn3P2O14 both experimentally and theoretically in light of metal-oxygen covalency, and the consequent generation of multiferroicity. It is known that the large covalency between Pb 6p and O 2p plays an instrumental role behind the stereo...
Article
Earlier comprehensive study of SrFeO 3−δ series of compounds showed interplay between the oxygen vacancy and the magnetic and transport properties of the system. We have synthesized a powder sample of SrFeO 3−δ series with oxygen vacancy in the range 0.15⩽δ⩽0.19. X-ray powder diffraction confirms the tetragonal crystal structure of the compound whi...
Preprint
Full-text available
Photo-induced phase transition (PIPT) provides an ultrafast, energy-efficient way for precisely manipulating the topological properties in transition-metal ditellurides, and can be used to stabilize a topological phase in an otherwise semiconducting phase. Using two-dimensional (2D) monolayer MoTe$_2$ as an example, we demonstrate that the PIPT fro...
Article
The structural, magnetic and dielectric properties of the hexagonal four-layered form of SrMnO3 along with its fluorinated counterpart have been investigated. Among these, the fluorinated hexagonal four-layered compound is being reported for the rst time. Although the bulk crystal structure does not change with fluorination, there are clear spectro...
Article
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Perovskite-structured AgNbO3 is a promising lead-free ferroelectric material that at room temperature exhibits weak ferroelectric behavior with a large polarization under an applied electric field. Here we report first-principles molecular dynamics (FPMD) simulations of monocrystalline AgNbO3 over a range of temperatures to examine the microscopic...
Article
Full-text available
We performed local structure analyses of relaxor ferroelectric of lead magnesium niobate (PMN) by combining an extended X-ray absorption fine structure (EXAFS) and atomic pair-distribution function (PDF) methods. EXAFS study revealed that Pb atoms of PMN are disordered largely compared with those of PbTiO3, though the local environment of the Nb at...
Article
We analyzed the local structures of NaNbO3 and AgNbO3 by combining the X-ray absorption fine structure (XAFS) and atomic pair-distribution function (PDF) techniques. NaNbO3 is known to be an antiferroelectric material at room temperature. It also undergoes a diffuse phase transition, in which orthorhombic and rhombohedral phases coexist over a wide...
Article
Full-text available
Coexistence of two phases of AgNbO3 is shown to explain the experimentally observed polarization–electric field hysteresis loop better than either phase in isolation, based on detailed first-principles calculations of the structural changes and stabilities of different phases of this compound. Calculations confirm a ferroelectric phase transition,...
Article
Full-text available
Recent developments in piezoelectric films have heightened the need for the reliable methods to correctly characterize their piezoelectric coefficients. Here, we demonstrate that capacitive displacement method can be used to determine longitudinal piezoelectric coefficients in both bulk and thin film of piezoelectric materials reliably and simply....
Research
Full-text available
Polycrystals of CaxBa1-xNb2O6(CBN) tungsten bronze type oxides have been prepared and their structural, dielectric, and thermal properties have been investigated. It was found that CBN alloys with ferroelectric tetragonal tungsten bronze structure were only available in a composition range of 0.19 <= x <= 0.32. It was also showed that CBN can be cl...
Article
Full-text available
We here report the substitution effects of the smaller Ca for the bulky Ba in (Ba1-xCax)(Ti1-yZry)O3 perovskite oxides for two systems (Ba1-xCax)TiO3 with y=0 and (Ba1-xCax)(Ti0.9Zr0.1)O3 with y=0.1. Ca off-centering was found to play a critical role in stabilizing the ferroelectric phase and tuning the polarization states in both systems. It was d...
Article
Full-text available
NaNbO3 has an antiferroelectric structure at room temperature and finds important technological applications. It exhibits an unusual complex sequence of temperature-and pressure-driven structural phase transitions. NaNbO3 shows unambiguous evidence for the presence of the ferroelectric R3c phase coexisting with an antiferroelectric phase (Pbcm) ove...
Article
Full-text available
Nb-related perovskite oxides, such as NaNbO3, KNbO3, and AgNbO3, are the end members of novel ferroelectric materials. Although they have NbO6 octahedron, the phase transition mechanism changes depending on A-site ion. NaNbO3 and KNbO3 have rhombohedral structure at low temperature, and after the structural phase transition, orthorhombic structure...
Article
Full-text available
(Bi0.5Na0.5)TiO3 and NaNbO3 are ABO3 perovskite ferroelectric materials and they are considered to be promising lead-free ferroelectric materials because of their relatively high piezoelectric properties in lead-free piezoelectric ceramics. Furthermore, disordered rhombohedral phases are included in their phase transition sequences. In these disord...
Article
Full-text available
AgNbO3 exhibits an antiferroelectric phase transition to the orthorhombic Pbcm phase at �626 K. At room temperature it exhibits ferroelectric behavior with a large spontaneous polarization. However, the ferroelectric structure is still not well understood, with different groups reporting it to have Pbcm symmetry, with its ferroelectricity attribute...
Article
Full-text available
The temperature dependence of piezoelectric resonance frequency, dielectric, and piezoelectric properties of (65-x)[Pb(Mg1/3Nb2/3)O3]–xBaTiO3-35PbTiO3(x¼ 0, 1, 2, 3) ceramics has been investigated. Sample compositions withx¼2 and 3 were found to exhibit a large piezoelectricresponse. Particularly,d31value was nearly a constant over a temperature ra...
Article
Full-text available
Combining our comprehensive investigations of polarization evolution, soft-mode by Raman scattering and microstructure by TEM, and the results reported in the literatures, we show that prototypical relaxor Pb(Mg1/3Nb2/3)O3 (PMN) is essentially ferroelectric for T<Tc~225 K. Its anomalous dielectric behavior over a broad temperature range results fro...
Article
Full-text available
The temperature dependence of elastic, dielectric, and piezoelectric properties of (65-x)Pb(Mg1/3Nb2/3)O3-xBaTiO335-PbTiO3 ceramics with x=0, 1, 2, 3, and 4 was investigated. Compound with x=2 was found to exhibit a large piezoelectric response (d31=-170 pC/N, d33=530 pC/N at 300 K). Particularly, its d31 value was nearly a constant over a temperat...
Article
Full-text available
AgNbO3 has been reported to undergo an antiferroelectric–ferroelectric phase transition between two orthorhombic phases (labeled M2 and M1) on cooling below �340 K. However, the phase transition mechanism is still not well understood, with different space groups proposed for the structure on the basis of different experimental techniques. Here, we...
Chapter
Introduction Expreimental Procedure Results and Discussion Conclusion Acknowledgement
Article
Full-text available
We perform a Raman scattering study to elucidate the mechanism of temperature independent dielectric response of Ba0.767Ca0.233TiO3 (BCTO-0.233) from a viewpoint of phonon dynamics. BCTO-0.233 remains tetragonal below Tc down to 3.5 K. Over-damped soft phonon observed in a pure BaTiO3 is found to become underdamped in BCTO-0.233, suggesting that lo...
Article
Full-text available
Polarization hysteresis loop of CaBi4Ti4O14 thin film has been studied in the frequency range from 200 Hz to 600 KHz for different applied voltages. It shows that the hysteresis loop is frequency- and voltage-dependent. The maximum polarization decreases logarithmically with the increase of frequency. In contrast, the remanent polarization exhibits...
Article
(001)-/(100)-and (111)-preferred Pb(Zr, Ti)O3 (PZT) films with different compositions were successfully deposited on Pt/Ti/SiO2/Si substrates through chemical solution deposition (CSD). The dielectric constants, polarization and piezoelectric properties (d33) for (001)-/(100)-and (111)-preferred PZT films depended on the compositions of the films a...
Article
Nano porous LaNiO3 (LNO) thin-film oxide electrodes were deposited on Si substrates by a chemical solution deposition (CSD) to control the residual stress in sputtered BaTiO3 (BTO) thin film. The BTO thin film was deposited on the LNO/Si substrate by RF magnetron sputtering to elucidate the effect of the LNO thin-film electrode on the ferroelectric...
Article
Nano porous LaNiO3 (LNO) thin-film oxide electrodes were deposited on Si substrates by a chemical solution deposition (CSD) to control the residual stress in sputtered BaTiO3 (BTO) thin film. The BTO thin film was deposited on the LNO/Si substrate by RF magnetron sputtering to elucidate the effect of the LNO thin-film electrode on the ferroelectric...
Article
Full-text available
There are two silver perovskite oxides: AgNbO3 and AgTaO3. AgNbO3 has a noncentrosymmetric group of Pmc21 at room temperature with a ferri-electric ordering of polarization. Such a ferri-electric state with small polarization can be changed into a ferroelectric state with very large polarization by a high electric field or by a chemical modificatio...
Article
Full-text available
We observed the evolution of polarization states and electromechanical coupling in (1 − x) AgNbO3-xNaNbO3 solid solutions using dielectric and strain hysteresis loop techniques and show that the polarization evolves from the ferrielectric ordering in AgNbO3 to the ferroelectric ordering in NaNbO3. The crossover between these two states occurs in th...
Article
LiNbO(3)-type MnMO(3) (M = Ti, Sn) were synthesized under high pressure and temperature; their structures and magnetic, dielectric, and thermal properties were investigated; and their relationships were discussed. Optical second harmonic generation and synchrotron powder X-ray diffraction measurements revealed that both of the compounds possess a p...
Article
The structure of AgNbO3 is determined by synchrotron and powder neutron diffraction, convergent-beam electron diffraction, SAED, and DFT calculations.
Article
Full-text available
TT hh ii ss dd oo cc uu mm ee nn tt ii ss dd oo ww nn ll oo aa dd ee dd aa tt ::, 3–5–1 Johoku, Naka-ku, Hamamatsu 432–8561 0.3 M BaTiO 3 (BT) precursor solution was prepared by the modified CSD, in which partially hydrolyzed Ti-alkoxide and Ba precursor solution was reacted in iced water bath to prepare the highly polymerized BT precursor solution...
Article
Systematic Raman scattering experiments were performed on Pb(Mg1/3Nb2/3)O3 (PMN) single crystals to resolve the low-wavenumber dynamics in the crystal. Careful checking of the angular dependence of the Raman spectra indicated that the intense peak around 45 cm−1, which always smears the low-wavenumber spectra, stems from the F2g mode due to Mg:Nb =...
Article
Crystal structure of ferroelectric silver niobate AgNbO3 was determined (Pmc21) by convergent beam electron, electron, neutron, and synchrotron diffraction techniques and first-principles calculations. The atomic displacements along the c axis in Pmc21 AgNbO3 are responsible for the spontaneous polarization, ferroelectricity, and the paraelectric-f...
Article
Full-text available
We report that an energetic plasma process is extremely effective in enlarging the unit cell volume and ferroelectric distortion of the ferroelectric oxides, resulting in a significant increase in its Tc. We demonstrate experimentally that c-axis oriented BaTiO3 films can be deposited directly on quartz glass and Si substrates using such a process...
Article
Full-text available
Phase evolution in (Ag(1-x)Li(x))NbO(3) (ALN) solid solution was investigated by the x-ray diffraction technique, dielectric and polarization measurements. It is shown that a small substitution of Ag with Li gives rise to an orthorhombic-rhombohedral structural transformation in ABO(3)-perovskite silver niobate at room temperature. Structural refin...
Article
A “0-0 type” multiferroic BaTiO3-NiFe2O4 (BT-NF) composite thin film was prepared on SrRuO3/(La,Sr)MnO3/CeO2/YSZ/Si(001) substrate using pulsed laser deposition (PLD). Epitaxial growth of the film was confirmed using x-ray pole figure measurements. Cross-sectional TEM observations revealed that the crystal structure and morphology of the BT-NF comp...
Article
Full-text available
The Raman scattering study was performed on BiFeO3 (BFO) both for polycrystal and single crystal forms. BFO was found to be easily damaged even by the weak power of the incident laser. The decomposition of BFO under the laser irradiation was investigated by examining the position dependence of the Raman spectrum over the irradiation area. Finally,...
Article
Full-text available
P-E hysteresis loop was measured for stoichiometric and non-stoichiometric NaNbO3. The untypical applied-field dependence of the hysteresis can be interpreted by the strong pinning effect on the domain reversal. The non-stoichiometry of the sample was found to enhance the pinning effect. It is finally concluded that NaNbO3 is intrinsically ferroele...
Article
Full-text available
Bio-compatible composite particles composed of hydroxyapatite (Ca10(PO4)6(OH)2, HAp) and ferrite (maghemite (γ-Fe2O3) or magnetite (Fe3O4)) were synthesized by two-step synthesis. In this work, co-precipitation method using aqueous solution of FeSO4 and FeCl3 was employed to synthesize γ-Fe2O3 and Fe3O4 particles. It was found that the resultant ph...
Article
CSD-derived ferroelectric thin films were successfully crystallized at low temperature by laser assisted annealing in this paper. Pb(ZrxTi1−x)O3(PZT) thin films with a MPB composition (Zr/Ti=53/47) and LaNiO3 (LNO) thin film electrodes were deposited by the chemical solution deposition (CSD) method on a Si wafer. The thickness of the PZT film was a...
Article
Lead-free barium zirconate titanate Ba(Zr1-xTix)O-3; BZT100x 0 <= x <= 0.1) thin films were deposited on lanthanum nickel oxide (LNO)/Pt/SiO2/Si substrate by chemical solution deposition (CSD). The Zr content was changed up to x = 0.1 to determine the effect of composition on the electrical properties. An LNO buffer layer was selected to control th...
Article
(Y,Yb)MnO3/Y2O3/Si structure was constructed using alkoxy-derived precursor solutions. The electrical properties of the Y2O3 films were sensitive to deposition condition. The (Y,Yb)MnO3 thin film were synthesized on Y2O3/Si(111) substrates at 750°C in Ar. The quality of Y2O3 films crystallized on Si substrates strongly affect the properties of the...
Article
Lead- and bismuth-free Ba(Ti1 − x Zr x )O3 (BTZ) thin films were fabricated on Pt(111)/Ti/SiO2/Si(100) substrates by the chemical solution deposition (CSD) process. The single phase BTZ thin films were obtained at 650°C by conventional process and the control of lattice parameter a was possible by Zr substitution. As the D-E hysteresis loops and J-...
Article
Two typical precursors for Bi4Ti3O12 thin films were analyzed spectroscopic methods and the local structure of those were chemically distinguished. Bi═Ti double alkoxide precursor containing Bi═O═Ti bonds promoted the homogeneous crystallization and was applicable to a series of Ca═Bi═Ti layer-structured ferroelectric thin films by addition of Ca i...
Article
BaxSr1-xTiO3 (BST) thin films were deposited by modified CSD, in which partially hydrolyzed Ti-alkoxide was reacted with Ba-Sr precursor solution to form highly polymerized BST precursor solutions, leading to the better electrical properties of the resultant thin films. BST precursor solutions of 0.1 M were prepared to deposit BST thin layers of 17...
Article
Thermal stability of bottom electrode thin films (La0.5Sr0.5)CoO3 (LSCO) and (La0.6Sr0.4)MnO3 (LSMO) were investigated. The crystallization and surface morphology of the heterostructure were characterized using x-ray diffraction and atomic force microscopy. Resistivity of the LSCO thin film was 25 Omega cm. However, the resistivity of LSCO thin fil...
Article
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TT hh ii ss dd oo cc uu mm ee nn tt ii ss dd oo ww nn ll oo aa dd ee dd aa tt :: Abstract. InN belongs to the III-group nitride materials and is known to have a low decomposition temperature which causes intractable grain growth compared to the other nitrides, GaN, AlN, etc. We prepared InNs with a flower-like shape as well as film structure by Atm...
Article
Full-text available
We report the lattice strain and polarization of the BaTiO(3)-CaTiO(3) solid solution. We found that the lattice strain evaluated by the tetragonality of the tetragonal phase at room temperature is nearly independent of the composition within the limit of the solid solution. In association with this variation, the saturation polarization remains ne...