H. H. Chen

Chinese Academy of Sciences, Peping, Beijing, China

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Publications (19)12.71 Total impact

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    ABSTRACT: The thermoelectric performance of EuCd(2)Sb(2) and YbCd(2)Sb(2) was improved by mixed cation occupation. The composition, structure, and thermoelectric properties of Yb(x)Eu(1-x)Cd(2)Sb(2) (x=0, 0.5, 0.75, and 1) have been investigated. Polycrystalline samples are prepared by direct reaction of the elements. Thermoelectric properties were investigated after densification of the materials by spark plasma sintering. Yb(x)Eu(1-x)Cd(2)Sb(2) crystallizes in the P3m1 space group. The lattice parameters increase with the europium content. These materials show low electrical resistivity, high Seebeck coefficient, and low thermal conductivity together with high carrier concentration and high carrier mobility. ZT values of 0.88 and 0.97 are obtained for Yb(0.5)Eu(0.5)Cd(2)Sb(2) and Yb(0.75)Eu(0.25)Cd(2)Sb(2) at 650 K, respectively.
    The Journal of Chemical Physics 11/2010; 133(19):194701. · 3.12 Impact Factor
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    ABSTRACT: ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
    ChemInform 10/2008; 39(42).
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    ABSTRACT: We report on the synthesis, crystal structure and scintillation property of a new compound BaInBO. This compound crystallizes in space group P6/m with unit cell of dimensions a=7.1359(3) A, c=16.6151(8) A and V=732.697 A³ with two BaInBO molecular formula. Its crystal structure is made up of planar BO groups parallel to each other along the direction, regular InO octahedra, irregular BaO hexagons and BaO polyhedra to form an analog structure of BaYBO. DTA and TGA curves for BaInBO show that it is a chemically stable and congruent melting compound. Its X-ray excited luminescence spectra show an intense emission band in the range of 360-500 nm with a maximum at 400 nm. Light yield for BaInBO is about 75% as large as that for BGO under the same measurement conditions. There may exist a correlation between the scintillation properties and the crystal structural features of BaInBO. - Graphical abstract: A new compound BaInBO was synthesized with space group P6/m, lattice parameters a=7.1359(3) A, c=16.6151(8) A, Z=2 and V=723.697 A³. Its crystal structure is made up of planar BO groups, regular InO octahedra, irregular BaO hexagons and BaO polyhedra. Its XEL spectra show an intense emission band in the range of 360-500 nm with light yield about 75% of BGO. The projection of the BaInBO structure along the direction. Display Omitted.
    Journal of Solid State Chemistry - J SOLID STATE CHEM. 01/2008; 181(3):646-651.
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    ABSTRACT: A novel borate compound Ba3ScB9O18 has been synthesized by solid-state reaction and its structure has been determined and refined from powder X-ray diffraction data. This compound crystallizes in a hexagonal cell (space group P63/m) with lattice parameters a=7.1360(4) Å and c=16.5420(9) Å, and each unit cell contains two formulas. Its crystal structure is made up of planar B3O6 groups parallel to each other along the [001] direction, regular ScO6 octahedra, irregular BaO6 hexagons, and BaO9 polyhedra to form an analogue structure of Ba3YB9O18. DTA and TGA curves for Ba3ScB9O18 show that it is a chemically stable and congruent melting compound. Luminescence properties for Ba3ScB9O18 were investigated using fluorescence spectroscopy and X-ray excited luminescence measurements. Its emission spectrum upon UV excitation (330 nm) has exhibited a prominent blue-green emission band at about 490 nm, and its XEL spectra show an intense emission band in the range of 360 to 500 nm with peak center at 400 nm. The light yield of Ba3ScB9O18 powders is about 23% as large as that of BGO powders under the same measurement conditions. There seems to be a certain relationship between the scintillation properties and the structural features of Ba3ScB9O18.
    Powder Diffraction. 12/2007; 22(04).
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    ABSTRACT: Hexagonal K Ca Gd ( P O <sub>4</sub>)<sub>2</sub>: RE <sup>3+</sup> ( RE = Ce , Tb , Eu , Tm , Sm ) were synthesized by coprecipitation method and their vacuum ultraviolet–ultraviolet (VUV-UV) spectroscopic properties were investigated. The bands at about 165 nm in the VUV excitation spectra are attributed to the host lattice absorptions. For Ce <sup>3+</sup> -doped samples, the bands at 207, 256, 275, and 320 nm are assigned to the 4f-5d transitions of Ce <sup>3+</sup> in K Ca Gd ( P O <sub>4</sub>)<sub>2</sub> . For Tb <sup>3+</sup> -doped sample, the bands at 203 and 222 nm are related to the 4f-5d spin-allowed transitions. For Eu <sup>3+</sup> -doped sample, the O <sup>2-</sup>– Eu <sup>3+</sup> charge-transfer band (CTB) at 229 nm is observed, and the fine emission spectrum of Eu <sup>3+</sup> indicates that Eu <sup>3+</sup> ions prefer to occupy Gd <sup>3+</sup> or Ca <sup>2+</sup> sites in the host lattice. For Tm <sup>3+</sup> - and Sm <sup>3+</sup> -doped samples, the O <sup>2-</sup>– Tm <sup>3+</sup> and O <sup>2-</sup>- – Sm <sup>3+</sup> CTBs are observed to be at 176 and 186 nm , respectively. From the standpoints of the absorption band, color purity, and luminescent intensity, Tb <sup>3+</sup> -doped K Ca Gd ( P O <sub>4</sub>)<sub>2</sub> is a potential candidate for 172 nm excited green plasma display phosphors.
    Journal of Applied Physics 12/2007; · 2.21 Impact Factor
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    ABSTRACT: A new borophosphate NH4Cd(H2O)(2)(BP2O8)(.)0.72H(2)O has been synthesized under mild hydrothermal conditions. The crystal structure was characterized by single crystal X-ray diffraction method. Crystal Data: Hexagonal, P6(5) (No. 176), a = 9.6978(16) &ANGS;, c = 16.026(4) &ANGS;, V = 1305.3(4) &ANGS;(3), Z = 6, R1 = 0.0256 and wR2 = 0.0665 for 1409 observed unique reflections and 146 variables. The structure is characterized by corner-sharing PO4 and BO4 tetrahedra, leading to infinite helical {[BP2O8](3-)} ribbons, which are connected by CdO4(H2O)(2) coordination octahedra. Nevertheless, the structure reveals significant difference from its other ammonium containing analogues with respect to the occupations of NH4+ and the metal cation. The abnormal changes of the unit cells comparing with cadmium borophosphates with other counter cations were presumably due to the anisotropic hydrogen bonds along the c-axis or on the ab-plane. Its UV-Vis fluorescence property was investigated for the first time.
    Zeitschrift für anorganische Chemie 01/2005; 631(6-7):1213-1217. · 1.16 Impact Factor
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    ABSTRACT: NaCd (H2O)(2)[BP2O8]center dot 0.8H(2)O and NaZn (H2O)(2) [BP(2)O(8)center dot H2O have been synthesized under room temperature and ambient pressure. The two borophosphates were characterized by powder X-ray diffraction. Their morphology were observed by SEM. The formation procedure of NaZn(H2O)(2)[BP2O8]center dot H2O was studied by in situ powder X-ray diffraction.
    Chinese Journal of Inorganic Chemistry. 01/2005; 21(6):826-829.
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    ABSTRACT: The first lutetium diphosphate NH4LUP2O7 has been prepared by a two-step, low-temperature self-flux synthesis in the presence of the F-anion, functioning as a mineralizer, which played a significant role in the synthetic process. The crystal structure has been characterized by single-crystal Xray diffraction. The title compound crystallizes in a monoclinic system of the space group P2(1)/c (No. 14), a = 7.651(2) angstrom, b = 10.789(2) angstrom, c = 8.577(2) angstrom, beta = 105.75(3)degrees, V = 681.4(2) angstrom(3), Z = 4, The three-dimensional framework of NH4LUP2O7, composed of LU2P4O14 building units formed by vertex-linking LUO6 and P2O7 goups, is isostructural with compounds of the type KAIP(2)O(7) in the ternary diphosphate(A(I)M(III)P(2)O(7)) system. X-ray-excited luminescence measurements of Ce-activated samples show insteresting scintillation properties with a short decay time of 16 ns at room temperature. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005).
    Berichte der deutschen chemischen Gesellschaft 01/2005; · 2.94 Impact Factor
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    ABSTRACT: A new organically templated cadmium chlorophosphate, (C3H6N2)[Cd2Cl2(HPO4)(2)] (C3H6N2 = diprotonated imidazole) with a novel layered structure, was synthesized hydrothermally in the presence of imidazole as a structure-directing agent. This is the first example of a cadmium chlorophosphate with polymeric chains that consist of Cd-O/Cl-Cd units.
    Chemistry Letters. 01/2004; 33(10):1282-1283.
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    ABSTRACT: A cesium indium hydrated phosphate, CsIn[PO3(OH)](2), was synthesized under mild hydrothermal conditions, and the crystal structures were characterized by single crystal X-ray diffraction method. CsIn[PO3(OH)](2) has a new type of crystal structure. Crystallographic data are as following: M-r=439.69, monoclinic, mP56, P1 2(1)/c 1 (No.14), a=0.532 86(6) nm, b=0.916 53(7) nm, c=1.478 39(14) nm, beta=93.849(9)degrees, V=0.720 4(1) nm(3), Z=4, D-x=4.054 g.cm(-3), mu=8.713 mm(-1), F(000)=800, R-1=0.0325, wR(2)=0.087 4 for 116 variables and 1502 contributing unique reflections. The structure is characterized by 6-membered column with cross-section formed by two InO6 octahedra and four PO4 tetrahedra. The condensation of the column forms an almost hexagonal close-packing array along a axis, resulting in close packing of 12-membered-ring channels occupied by Cs+ cations. The connections of the columns and channels result in a three-dimensional network structure. The formation of the 12-membered ring in these structures seems clearly governed by the cation size by comparing to Na2In2[PO3(OH)](4).H2O with the similar stoichiometry. The topological construction of the title structure can be considered as an augmented 6,3-net. Rbln [PO3(OH)](2) is isotypic to the Cs compound.
    Chinese Journal of Inorganic Chemistry. 01/2004; 20(10):1191-1196.
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    ABSTRACT: NaO12P3Sn4, trigonal, R3c (no. 161), a = 9.594(1) Angstrom c = 24.186(5) Angstrom, V = 1927.8 Angstrom(3), Z = 6, R-gt(F) = 0.023, wR(ref)(F-2) = 0.056, T = 293 K.
    Zeitschrift Fur Kristallographie-New Crystal Structures. 01/2004; 219(3):205-206.
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    ABSTRACT: A new sodium indium phosphate Na6In4[P7O24(OH)(5)] (.) 4H(2)O was synthesized under a mild hydrothermal condition and its structure was determined by means of single-crystal X-ray diffraction methods. The title compound crystallizes in a hexagonal system, space group P6(3), with a = 0.950 23(5) nm, b = 0.950 23(5) nm, c = 1.694 2(2) nm, alpha = 90degrees, beta = 90degrees, gamma = 120degrees, V = 1.324 8(2) nm(3), Z = 8, structure refined to R = 0.052 8 and wR = 0.116 5 for 2 134 independent observed reflections. The three-dimensional network structure consists of helical chains formed by apex-sharing polyhedra. The connection of the chains results in 4- and 8-polyhedral rings and cages centered by three indium metal connecting oxygen atoms formed by three 4-rings. The three-connected oxygen atom is firstly observed in indium phosphate systems.
    Chemical Journal of Chinese Universities-Chinese. 01/2004; 25(10):1813-1815.
  • Zeitschrift Fur Kristallographie-New Crystal Structures. 01/2002; 217(3):309-310.
  • Zeitschrift Fur Kristallographie-New Crystal Structures. 01/2002; 217(3):311-312.
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    ABSTRACT: An ammonium indium hydrogen phosphate, NH4In(OH)PO4, was synthesized under mild hydrothermal conditions, and the crystal structure was characterized by single-crystal X-ray diffraction method. The compound crystallizes with the RbIn(OH)PO4 type with the following data: Mr=244.84, tetragonal, tP104, P43212 (No.96), a=9.416(2) Å, c=11.159(3) Å, V=989.9(3) Å3, Z=8, Dx=3.288 g cm−3, λ=0.71073 Å, μ=50.34 cm−1, F(000)=928, T=293 K, R1=0.0606, wR2=0.1472 for 91 variables and 1813 contributing unique reflections. The structure is characterized by chiral InO4(OH)2 chains along the c axis formed by sharing OH corners. The chains are isolated by PO4 tetrahedra leading to a three-dimensional framework structure with channels occupied by NH4+ ions. The framework structure is similar to that of KIn(OH)PO4 and γ-NaTiOPO4. The hydrogen bonds formed by NH4+ with the polyhedral oxygen atoms play an important role in the anisotropic changes of the lattice with respect to its alkali metal analogues. The topological construction of the title structure can be considered as an augmented 4,6-net with larger porosity.
    Journal of Solid State Chemistry 01/2002; 165(2):209-213. · 2.04 Impact Factor
  • W. Qin, Z. J. Zhang, H. H. Chen
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    ABSTRACT: A novel chemiluminescence(CL) sensor has been developed for determining hydrogen peroxide in rainwater. The analytical reagents involved in the CL reaction, including luminol and copper ion were immobilized on anion exchange resin and cation exchange resin, respectively. While a volume of sodium sulphate was passed through a column with immobilized reagents, these two reagents were eluted from the resins and then reacted with hydrogen peroxide in alkaline aqueous solution to produce CL. The CL emission intensity was correlated with the hydrogen peroxide concentration in the range 8 × 10 to 1 × 10 M, and the detection limit was 3.5 × 10 M hydrogen peroxide. Interfering ions present in rainwater were effectively separated on-line by an upstream ion exchanger. A complete analysis, including sampling and washing, could be performed in l min with a relative standard deviation of less than 5%. The system was stable for over 200 analyses and has been applied successfully to the determination of hydrogen peroxide in rainwater samples.
    International Journal of Environmental Analytical Chemistry 03/1997; 66(3):191-200. · 1.24 Impact Factor
  • W. Qin, Z. J. Zhang, H. H. Chen
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    ABSTRACT: A highly sensitive chemiluminescence(CL) flow sensor is proposed for the determination of ascorbic acid. The analytical reagents luminol and iron(II) are immobilized on anion-exchange and cation-exchange resins, respectively, and can be eluted by sodium sulphate. The calibration graphs are linear in the range 1 × 10–9 to 1 × 10–6 g mL–1 and the detection limit is 4.0 × 10–10 g mL–1. The sensor has been applied successfully to the determination of ascorbic acid in vegetables.
    Fresenius Journal of Analytical Chemistry 358(7):861-863.
  • Dalton Transactions, v.39, 1101-1104 (2010).
  • Journal of Electronic Materials, v.39, 1772-1776 (2010).

Publication Stats

17 Citations
12.71 Total Impact Points

Institutions

  • 2005–2010
    • Chinese Academy of Sciences
      • • Institute of Physics
      • • State Key Laboratory of High Performance Ceramics and Superfine Microstructures
      Peping, Beijing, China
    • Xiamen University
      • College of Chemistry and Chemical Engineering
      Xiamen, Fujian, China
    • Northeast Institute of Geography and Agroecology
      • Graduate School
      Beijing, Beijing Shi, China
  • 1997
    • Shaanxi Normal University
      Xi’an, Guangdong, China