Order-Disorder Phase Formation in the Complex Perovskite Compounds Ba(Ni1/3Nb2/3)O3 and Ba(Zn1/3Nb2/3)O3 |
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| Authors: | Kug Sun Hong In-Tae Kim Chong-Don Kim |
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| Affiliation: | Department of Inorganic Materials Engineering, Seoul National University, Seoul 151-742, Korea;Ceramics Division, Korea Institute of Science and Technology, Cheongryang, Seoul, Korea |
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| Abstract: | The order-disorder phase formation of the complex perovskite compounds Ba(Ni1/3Nb2/3)O3 (BNN) and Ba(Zn1/3-Nb2/3)O3 (BZN) was investigated using X-ray diffraction, transmission electron microscopy, scanning electron microscopy, and energy-dispersive spectroscopy. The BNN and BZN samples were sintered over a temperature range of 1200° to 1500°C in air for 2 h. X-ray diffraction and transmission electron microscopy showed that these compounds exhibited a 1:2 ordering on the B-site within a narrow temperature range. When BNN and BZN were sintered above 1400° and 1350°C, respectively, a liquid phase formed in the grain boundary which was accompanied by disordering. The composition of the liquid phase resembled that of pyrochlore, with a small amount of nickel for BNN or zinc for BZN. The disordering with the formation of the liquid phase was attributed to the increase in defect concentration. |
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