中国物理B ›› 2013, Vol. 22 ›› Issue (5): 57201-057201.doi: 10.1088/1674-1056/22/5/057201

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Electrical transport and thermoelectric properties of Ni-doped perovskite-type YCo1-xNixO3 (0≤ x ≤0.07) prepared by sol-gel process

刘义, 李海金, 张清, 李勇, 刘厚通   

  1. School of Mathematics and Physics, Anhui University of Technology, Ma'anshan 243032, China
  • 收稿日期:2012-10-13 修回日期:2012-11-05 出版日期:2013-04-01 发布日期:2013-04-01
  • 基金资助:
    Project supported by the Key Laboratory of Novel Thin Film Solar Cells, Chinese Academy of Sciences (Grant No. KF201101), the Key Science Foundation of Higher Education Institutions of Anhui Province, China (Grant Nos. KJ2011A053 and KJ2012Z034), and the National Natural Science Foundation of China (Grant Nos. 51202005, 11204005, and 41075027).

Electrical transport and thermoelectric properties of Ni-doped perovskite-type YCo1-xNixO3 (0≤ x ≤0.07) prepared by sol-gel process

Liu Yi (刘义), Li Hai-Jin (李海金), Zhang Qing (张清), Li Yong (李勇), Liu Hou-Tong (刘厚通)   

  1. School of Mathematics and Physics, Anhui University of Technology, Ma'anshan 243032, China
  • Received:2012-10-13 Revised:2012-11-05 Online:2013-04-01 Published:2013-04-01
  • Contact: Liu Yi E-mail:yliu6@ahut.edu.cn
  • Supported by:
    Project supported by the Key Laboratory of Novel Thin Film Solar Cells, Chinese Academy of Sciences (Grant No. KF201101), the Key Science Foundation of Higher Education Institutions of Anhui Province, China (Grant Nos. KJ2011A053 and KJ2012Z034), and the National Natural Science Foundation of China (Grant Nos. 51202005, 11204005, and 41075027).

摘要: Electrical transport and thermoelectric properties of Ni-doped YCo1-xNixO3 (0≤ x ≤0.07), prepared by using sol-gel process, are investigated in a temperature range from 100 to 780 K. The results show that with the increase of Ni doping content, the values of DC resistivity of YCo1-xNixO3 decrease, but carrier concentration increases. The temperature dependences of the resistivity for YCo1-xNixO3 are found to follow a relation of lnρ ∝ 1/T in a low-temperature rang (LTR) (T<~304 K for x=0; ~ 230 K < T <~500 K for x=0.02, 0.05, and 0.07) and high-temperature range (HTR) (T > ~ 655 K for all compounds), respectively. The estimated apparent activation energies for conduction Ea1 in LRT and Ea2 in HTR are both found to decrease monotonically with doping content increasing. At very low temperatures (T < ~ 230 K), Mott's law is observed for YCo1-xNixO3 (x ≥ 0.02), indicating that considerable localized states form in the heavy doping compounds. Although the Seebeck coefficient of the compound decreases after Ni doping, the power factor of YCo1-xNixO3 is enhanced remarkably in a temperature range from 300 to 740 K, i.e., a 6-fold increase is achieved at 500 K for YCo0.98Ni0.02O3, indicating that the high-temperature thermoelectric property of YCoO3 can be improved by partial substitution of Ni for Co.

关键词: perovskite cobalt oxides, sol-gel process, electrical transport, thermoelectric property

Abstract: Electrical transport and thermoelectric properties of Ni-doped YCo1-xNixO3 (0≤ x ≤0.07), prepared by using sol-gel process, are investigated in a temperature range from 100 to 780 K. The results show that with the increase of Ni doping content, the values of DC resistivity of YCo1-xNixO3 decrease, but carrier concentration increases. The temperature dependences of the resistivity for YCo1-xNixO3 are found to follow a relation of lnρ ∝ 1/T in a low-temperature rang (LTR) (T<~304 K for x=0; ~ 230 K < T <~500 K for x=0.02, 0.05, and 0.07) and high-temperature range (HTR) (T > ~ 655 K for all compounds), respectively. The estimated apparent activation energies for conduction Ea1 in LRT and Ea2 in HTR are both found to decrease monotonically with doping content increasing. At very low temperatures (T < ~ 230 K), Mott's law is observed for YCo1-xNixO3 (x ≥ 0.02), indicating that considerable localized states form in the heavy doping compounds. Although the Seebeck coefficient of the compound decreases after Ni doping, the power factor of YCo1-xNixO3 is enhanced remarkably in a temperature range from 300 to 740 K, i.e., a 6-fold increase is achieved at 500 K for YCo0.98Ni0.02O3, indicating that the high-temperature thermoelectric property of YCoO3 can be improved by partial substitution of Ni for Co.

Key words: perovskite cobalt oxides, sol-gel process, electrical transport, thermoelectric property

中图分类号:  (Thermoelectric and thermomagnetic effects)

  • 72.15.Jf
72.20.Ee (Mobility edges; hopping transport) 72.80.Ga (Transition-metal compounds)