| 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 |
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| ABSTRACT |
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_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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