Synthesis and conductivity properties of Gd0.8Ca0.2BaCo2O5+δ double perovskite by sol–gel combustion
作者： Rong Zhang , Yi Lu , Ling Wei , Zhenggang Fang , Chunhua Lu
DOI: 10.1007/S10854-015-3670-3
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摘要: Double perovskite oxides Gd0.8Ca0.2BaCo2O5+δ have been successfully prepared by EDTA-citrate complexation process. The samples were characterized means of thermogravimetry–differential analysis, X-ray diffraction, Fourier transform infrared spectroscopy techniques. These analyses suggested that pure phase could be formed when the pH value was maintained above three and calcination temperature higher than 850 °C. conductivity properties analyzed four probes method, scanning electron microscopy photoelectron indicated an improvement in with a high nearly 1200 S/cm, which due to increase number small polaron hopping conduction units, Co3+–O–Co4+. Interestingly, exhibited semiconducting behavior through wide range below 100 °C metallic at 100–500 °C, thereby demonstrating meet requirements smart material.
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