skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Electrical and thermal transport properties of layered Bi{sub 2}YO{sub 4}Cu{sub 2}Se{sub 2}

Abstract

Bi{sub 2}YO{sub 4}Cu{sub 2}Se{sub 2} possesses a low thermal conductivity and high electrical conductivity at room temperature, which was considered as a potential thermoelectric material. In this work, we have investigated the electrical and thermal transport properties of Bi{sub 2}YO{sub 4}Cu{sub 2}Se{sub 2} system in the temperature range from 300 K to 873 K. We found that the total thermal conductivity decreases from ~1.8 W m{sup −1} K{sup −1} to ~0.9 W m{sup −1} K{sup −1}, and the electrical conductivity decreases from ~850 S/cm to ~163 S/cm in the measured temperature range. To investigate how potential of Bi{sub 2}YO{sub 4}Cu{sub 2}Se{sub 2} system, we prepared the heavily Iodine doped samples to counter-dope intrinsically high carrier concentration and improve the electrical transport properties. Interestingly, the Seebeck coefficient could be enhanced to ~+80 μV/K at 873 K, meanwhile, we found that a low thermal conductivity of ~0.7 W m{sup −1} K{sup −1} could be achieved. The intrinsically low thermal conductivity in this system is related to the low elastic properties, such as Young's modulus of 70–72 GPa, and Grüneisen parameters of 1.55–1.71. The low thermal conductivity makes Bi{sub 2}YO{sub 4}Cu{sub 2}Se{sub 2} system to be a potential thermoelectric material, the ZT valuemore » ~0.06 at 873 K was obtained, a higher performance is expected by optimizing electrical transport properties through selecting suitable dopants, modifying band structures or by further reducing thermal conductivity through nanostructuring etc. - Highlights: • The total thermal conductivity decreases from 1.8 to 0.9 Wm{sup –1}K{sup –1} at 300–873K. • The electrical conductivity decreased from 850 to 163 S/cm at 300–873K. • The Seebeck coefficients were enhanced through heavily Iodine doping. • The ZT ~0.06 at 873K suggests that Bi{sub 2}YO{sub 4}Cu{sub 2}Se{sub 2} systems are potential thermoelectrical materials.« less

Authors:
; ; ;  [1];  [2];  [3];  [1];  [2];  [3];  [1]
  1. School of Materials Science and Engineering, Beihang University, Beijing 100191 (China)
  2. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084 (China)
  3. Department of Physics, South University of Science and Technology of China, Shenzhen 518055 (China)
Publication Date:
OSTI Identifier:
22584159
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 239; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BISMUTH COMPLEXES; COPPER COMPLEXES; DOPED MATERIALS; ELASTICITY; ELECTRIC CONDUCTIVITY; IODINE; NANOSTRUCTURES; PERFORMANCE; PRESSURE RANGE GIGA PA; SELENIUM COMPLEXES; TEMPERATURE RANGE 0273-0400 K; THERMAL CONDUCTIVITY; THERMOELECTRIC MATERIALS

Citation Formats

Xiao, Yu, Pei, Yanling, Chang, Cheng, Zhang, Xiao, Tan, Xing, Ye, Xinxin, Gong, Shengkai, Lin, Yuanhua, He, Jiaqing, and Zhao, Li-Dong, E-mail: zhaolidong@buaa.edu.cn. Electrical and thermal transport properties of layered Bi{sub 2}YO{sub 4}Cu{sub 2}Se{sub 2}. United States: N. p., 2016. Web. doi:10.1016/J.JSSC.2016.03.032.
Xiao, Yu, Pei, Yanling, Chang, Cheng, Zhang, Xiao, Tan, Xing, Ye, Xinxin, Gong, Shengkai, Lin, Yuanhua, He, Jiaqing, & Zhao, Li-Dong, E-mail: zhaolidong@buaa.edu.cn. Electrical and thermal transport properties of layered Bi{sub 2}YO{sub 4}Cu{sub 2}Se{sub 2}. United States. doi:10.1016/J.JSSC.2016.03.032.
Xiao, Yu, Pei, Yanling, Chang, Cheng, Zhang, Xiao, Tan, Xing, Ye, Xinxin, Gong, Shengkai, Lin, Yuanhua, He, Jiaqing, and Zhao, Li-Dong, E-mail: zhaolidong@buaa.edu.cn. 2016. "Electrical and thermal transport properties of layered Bi{sub 2}YO{sub 4}Cu{sub 2}Se{sub 2}". United States. doi:10.1016/J.JSSC.2016.03.032.
@article{osti_22584159,
title = {Electrical and thermal transport properties of layered Bi{sub 2}YO{sub 4}Cu{sub 2}Se{sub 2}},
author = {Xiao, Yu and Pei, Yanling and Chang, Cheng and Zhang, Xiao and Tan, Xing and Ye, Xinxin and Gong, Shengkai and Lin, Yuanhua and He, Jiaqing and Zhao, Li-Dong, E-mail: zhaolidong@buaa.edu.cn},
abstractNote = {Bi{sub 2}YO{sub 4}Cu{sub 2}Se{sub 2} possesses a low thermal conductivity and high electrical conductivity at room temperature, which was considered as a potential thermoelectric material. In this work, we have investigated the electrical and thermal transport properties of Bi{sub 2}YO{sub 4}Cu{sub 2}Se{sub 2} system in the temperature range from 300 K to 873 K. We found that the total thermal conductivity decreases from ~1.8 W m{sup −1} K{sup −1} to ~0.9 W m{sup −1} K{sup −1}, and the electrical conductivity decreases from ~850 S/cm to ~163 S/cm in the measured temperature range. To investigate how potential of Bi{sub 2}YO{sub 4}Cu{sub 2}Se{sub 2} system, we prepared the heavily Iodine doped samples to counter-dope intrinsically high carrier concentration and improve the electrical transport properties. Interestingly, the Seebeck coefficient could be enhanced to ~+80 μV/K at 873 K, meanwhile, we found that a low thermal conductivity of ~0.7 W m{sup −1} K{sup −1} could be achieved. The intrinsically low thermal conductivity in this system is related to the low elastic properties, such as Young's modulus of 70–72 GPa, and Grüneisen parameters of 1.55–1.71. The low thermal conductivity makes Bi{sub 2}YO{sub 4}Cu{sub 2}Se{sub 2} system to be a potential thermoelectric material, the ZT value ~0.06 at 873 K was obtained, a higher performance is expected by optimizing electrical transport properties through selecting suitable dopants, modifying band structures or by further reducing thermal conductivity through nanostructuring etc. - Highlights: • The total thermal conductivity decreases from 1.8 to 0.9 Wm{sup –1}K{sup –1} at 300–873K. • The electrical conductivity decreased from 850 to 163 S/cm at 300–873K. • The Seebeck coefficients were enhanced through heavily Iodine doping. • The ZT ~0.06 at 873K suggests that Bi{sub 2}YO{sub 4}Cu{sub 2}Se{sub 2} systems are potential thermoelectrical materials.},
doi = {10.1016/J.JSSC.2016.03.032},
journal = {Journal of Solid State Chemistry},
number = ,
volume = 239,
place = {United States},
year = 2016,
month = 7
}
  • Thermal degradation of TiSi[sub 2]/TiW/AlSi layered structures is studied by the resistivity measurements on samples annealed in the temperature range of 400--550[degrees]C. The effect of using pure TiW and stuffed TiW(N) as a diffusion barrier on the reaction kinetics of the layered structure is studied. The change in the resistivity is correlated to the rate of formation of intermetallic compound. It is shown that the reaction rate of the compound formation is reduced by about 25% for TiW(N) barrier layer compared to pure TiW annealed at 500[degrees]C. 10 refs., 4 figs.
  • Layered LnBaCo{sub 2}O{sub 5+{delta}} (Ln = Nd, Sm) with the cation-ordered double perovskite structure were synthesized by the solid-state reaction route and characterized by X-ray diffraction, thermogravimetric analysis and dilatometry. For NdBaCo{sub 2}O{sub 5.73} and SmBaCo{sub 2}O{sub 5.61} equilibrated with atmospheric oxygen at low temperatures, tetragonal and orthorhombic polymorphs were found to form, respectively. The oxygen content at 300-1300 K decreases with decreasing rare-earth cation size, whilst {delta} variations and chemical contribution to the apparent thermal expansion in air are substantially lower compared to the disordered (Ln, A)CoO{sub 3-{delta}} (A = Ca, Sr) analogues. The average thermal expansion coefficients aremore » 23.1 x 10{sup -6} K{sup -1} for NdBaCo{sub 2}O{sub 5+{delta}} and 20.8 x 10{sup -6} K{sup -1} for SmBaCo{sub 2}O{sub 5+{delta}} at 300-1370 K and atmospheric oxygen pressure. These values are comparable to those of Bi{sub 2}O{sub 3}-based ionic conductors, but are incompatible with common electrolytes such as stabilized zirconia or doped ceria. The oxygen partial pressure dependencies of the total conductivity and Seebeck coefficient, studied in the P(O{sub 2}) range from 10{sup -10} to 1 atm, confirm predominant p-type electronic conductivity.« less
  • The effects of substituting divalent metal ions (Mg, Ca, Sr, Ba) for Y in YCrO/sub 3/ were investigated by electrical conductivity, Seebeck coefficient, and thermal conductivity measurements. The electrical conductivity results were consistent with the hopping-type conduction of a temperature-independent concentration of small polarons, with measured activation energies of 0.18--0.26 eV. The Seebeck coefficient increased nearly linearly with temperature and indicated p-type conductivity. Both electrical conductivity and Seebeck coefficient results show a strong dependence on dopant size (ionic radius) and indicate that the highest carrier concentrations were associated with Ca as the dopant, which is attributed to the similar ionicmore » radii of Ca/sup 2 +/ and Y/sup 3 +/. The thermal conductivity decreased slightly with temperature and dopant concentration.« less
  • Thermal, dielectric, and electron transport properties of dihydrated and anhydrous perrhenates of strontium, barium, cadmium, and lead have been investigated. The DTA of anhydrous M(ReO/sub 4/)/sub 2/ (M = Sr, Ba, Cd) compounds exhibit three reversible phase transitions with considerable thermal hysterisis for the first phase transformation. A single reversible phase transition occurs for Pb(ReO/sub 4/)/sub 2/. The parent phases of Ba(ReO/sub 4/)/sub 2/, Pb(ReO/sub 4/)/sub 2/ behave as semiconductors at elevated temperatures. The dielectric constants measured for Sr(ReO/sub 4/)/sub 2/ in the temperature range 30 to -160/sup 0/C give a broad inflection between -40 and -70/sup 0/C, which probablymore » indicates a phase transition« less