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

Rong Zhang, Yi Lu, Ling Wei, Zhenggang Fang, Chunhua Lu, Yaru Ni, Zhongzi Xu, Shunyan Tao, Peiwen Li

Research output: Contribution to journalArticlepeer-review

48 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)9941-9948
Number of pages8
JournalJournal of Materials Science: Materials in Electronics
Issue number12
StatePublished - Dec 1 2015

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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