Effect of microstructure on microwave dielectric properties of Al 2O3-added Ba(Zn1/3Ta2/3)O 3 ceramics

Min Han Kim; Sahn Nahm; Woo Sung Lee; Myong Jae Yoo; Jong Cheol Park; Hwack Joo Lee

doi:10.1143/JJAP.43.1438

Effect of microstructure on microwave dielectric properties of Al ₂O₃-added Ba(Zn_1/3Ta_2/3)O ₃ ceramics

Min Han Kim, Sahn Nahm, Woo Sung Lee, Myong Jae Yoo, Jong Cheol Park, Hwack Joo Lee

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

The effects of Al₂O₃ additive on the microstructure and microwave dielectric properties of Ba(Zn_1/3Ta_2/3) 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.

Original language	English
Pages (from-to)	1438-1441
Number of pages	4
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	43
Issue number	4 A
DOIs	https://doi.org/10.1143/JJAP.43.1438
Publication status	Published - 2004 Apr

Keywords

1:2 ordering
AlO
Ba(ZnTa)O
Grain size
Q value

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

Access to Document

10.1143/JJAP.43.1438

Cite this

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title = "Effect of microstructure on microwave dielectric properties of Al 2O3-added Ba(Zn1/3Ta2/3)O 3 ceramics",

abstract = "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.",

keywords = "1:2 ordering, AlO, Ba(ZnTa)O, Grain size, Q value",

author = "Kim, {Min Han} and Sahn Nahm and Lee, {Woo Sung} and Yoo, {Myong Jae} and Park, {Jong Cheol} and Lee, {Hwack Joo}",

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AU - Kim, Min Han

AU - Nahm, Sahn

AU - Lee, Woo Sung

AU - Yoo, Myong Jae

AU - Park, Jong Cheol

AU - Lee, Hwack Joo

PY - 2004/4

Y1 - 2004/4

N2 - 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.

AB - 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.

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