Effect of Microstructure on Microwave Dielectric Properties of Al2O3-Added Ba(Zn1/3Ta2/3)O3 Ceramics
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概要
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The effects of Al2O3 additive on the microstructure and microwave dielectric properties of Ba(Zn1/3Ta2/3)O3 (BZT) ceramics were investigated. The BZT ceramics has a $1:2$ ordered hexagonal structure. The degree of the $1:2$ ordering did not decrease with the addition of Al2O3. Grain growth occurred and the liquid phase formed for the Al2O3-added BZT ceramics sintered above 1580°C. The liquid phase contains high concentrations of Ba and Al ions, which could be responsible for the grain growth. When a small amount of Al2O3 was added, the relative density slightly decreased but the $Q$ value was markedly enhanced. The increase in the $Q$ value was not related to the relative density or the $1:2$ ordering. In contrast, the improvement in the $Q$ value occurred in specimens in which grain growth occurred. Therefore, the increase in the grain size is considered to be responsible for the improvement in the $Q$ value of Al2O3-added BZT.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2004-04-15
著者
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Lee Hwack-joo
New Materials Evaluation Center Korea Research Institute Of Standards And Science
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Yoo Myong-jae
Korea Electronics Technology Institute
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LEE Woo-Sung
Korea Electronics Technology Institute
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PARK Jong-Cheol
Korea Electronics Technology Institute
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Kim Min-han
Department Of Materials Science And Engineering Korea University
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Nahm Sahn
Department Of Materials Science And Engineering Korea University
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Nahm Sahn
Department of Materials Science and Engineering, Korea University, 1-5 Ka, Anam-Dong, Sungbuk-Ku, Seoul 136-701, Korea
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Park Jong-Cheol
Korea Electronics Technology Institute, 455-6, Masan-ri, Jinwi-Myon, Pyungtaek-si, Kyeonggi-do 451-865, Korea
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