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Synthesis and conductivity properties of Gd0.8Ca0.2BaCo2O5+δ double perovskite by sol–gel combustion

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Abstract

Double perovskite oxides Gd0.8Ca0.2BaCo2O5+δ have been successfully prepared by EDTA-citrate complexation process. The prepared samples were characterized by means of thermogravimetry–differential analysis, X-ray diffraction, Fourier transform infrared spectroscopy techniques. These analyses suggested that pure Gd0.8Ca0.2BaCo2O5+δ phase could be formed when the pH value was maintained above three and calcination temperature was higher than 850 °C. The conductivity properties analyzed by means of four probes method, scanning electron microscopy and X-ray photoelectron spectroscopy indicated an improvement in conductivity with a high value of nearly 1200 S/cm, which was due to an increase in the number of small polaron hopping conduction units, Co3+–O–Co4+. Interestingly, the Gd0.8Ca0.2BaCo2O5+δ samples exhibited a semiconducting behavior through a wide range of temperature below 100 °C and a metallic behavior at 100–500 °C, thereby demonstrating that Gd0.8Ca0.2BaCo2O5+δ could meet the requirements of a smart material.

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Acknowledgments

This work was supported by the funding from the Priority Academic Program Development of the Jiangsu Higher Education Institutions (PAPD), the Innovation Foundation for Graduate Students of Jiangsu Province (KYLX_0745), the Innovation Foundation for Graduate Students of Jiangsu Province (CXZZ13_0425), the independent research topic of State Key Laboratory of Materials-Oriented Chemical Engineering (ZK201211), as well as the Key Laboratory of Inorganic Coating Materials, Chinese Academy of Sciences (KLICM-2014-10).

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Authors and Affiliations

  1. State Key Laboratory of Materials-Orient Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 210009, People’s Republic of China

    Rong Zhang, Yi Lu, Ling Wei, Zhenggang Fang, Chunhua Lu, Yaru Ni & Zhongzi Xu

  2. Key Laboratory of Inorganic Coating Materials, Chinese Academy of Sciences, Shanghai, 200050, People’s Republic of China

    Shunyan Tao

  3. Department of Aerospace and Mechanical Engineering, The University of Arizona, Tucson, AZ, 85721, USA

    Peiwen Li

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  1. Rong Zhang
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  2. Yi Lu
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  3. Ling Wei
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  4. Zhenggang Fang
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  5. Chunhua Lu
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Correspondence to Chunhua Lu or Zhongzi Xu.

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Zhang, R., Lu, Y., Wei, L. et al. Synthesis and conductivity properties of Gd0.8Ca0.2BaCo2O5+δ double perovskite by sol–gel combustion. J Mater Sci: Mater Electron 26, 9941–9948 (2015). https://doi.org/10.1007/s10854-015-3670-3

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  • DOI: https://doi.org/10.1007/s10854-015-3670-3

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