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J. Korean Ceram. Soc. > Volume 39(1); 2002 > Article
Journal of the Korean Ceramic Society 2002;39(1): 68.
doi: https://doi.org/10.4191/kcers.2002.39.1.068
La2O3-Al2O3와 La2O3-Al(OH)3를 메카노케미칼로 처리한 LaAlO3세라믹스의 소결 및 유전특성
최상수, 조정호, 김강언, 정수태, 조상희1
부경대학교 전자공학과
1경북대학교 무기재료공학과
Sintering and Dielectric Characteristics of LaAlO3 Ceramics by Mechanochemical Treatment from La2O3-A12O3 and La2O3-Al(OH)3
_3$of LAO and LAH powders were formed at 130$0^{circ}C$ and 100$0^{circ}C$, respectively. A non-reacted La$_2$O$_3$ existing in calcined powder was changed to La(OH)$_3$by moisture in the air, and their samples were worse than those of the samples made from a LaA1O$_3$single phase powder. The densities of LAO samples sintered at 150$0^{circ}C$ for 4 h and LAH samples sintered at 140$0^{circ}C$ for 4 h were 97.3% and 98.3% of theory density, respectively. Grains of LAH sample showed uniformity and their sizes were 0.75 ${mu}{textrm}{m}$, and LAO samples showed non-uniformity and their sizes were 4-5 ${mu}{textrm}{m}$. Dielectric constant of LAO and LAH samples were the same value (≒22), however dielectric loss of LAH sample (0.0003) were lower than that of LAO sample(0.001)due to grain size.
Key words: $LaA1O_3$, Mechanochemical, Dielectric constant, Dielectric loss
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