Structure, synthesis and high dielectric property of (NaBi)(NbCr)O6 pyrochlores |
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| Authors: | Yu-Jen Hsiao Yen-Hwei Chang Te-Hua Fang Yee-Shin Chang Yin-Lai Chai |
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| Affiliation: | aDepartment of Materials Science and Engineering, National Cheng Kung University, Tainan 701, Taiwan;bInstitute of Mechanical and Electromechanical Engineering, National Formosa University, Yunlin 632, Taiwan;cInstitute of Electro-Optical and Materials Science, National Formosa University, Yunlin 632, Taiwan;dDepartment of Resources Engineering, Dahan Institute of Technology, Hualien 971, Taiwan |
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| Abstract: | Pyrochlores with composition (NaBi)(NbCr)O6 were sintered in the temperature range of 1100–1250 °C. Dielectric properties of the ceramics were investigated in a wide range of temperatures of − 15 to 200 °C and frequencies of 1–800 kHz. The suitable sintering temperatures for (NaBi)(NbCr)O6 ceramics are suggested from 1150 to 1200 °C. The dielectric constant behavior reflects, in our opinion, the formation of the space charge and the orientational polarization. The pyrochlores have convex resistivity-temperature characteristics around the transition point, and exhibit the negative temperature coefficient of resistance characteristics. The activation energies of conductivity of samples were obtained at various sintering temperatures. |
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| Keywords: | Dielectric Relaxation Solid-state reaction Pyrochlore Resistivity |
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