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http://dx.doi.org/10.4191/KCERS.2002.39.1.068

Sintering and Dielectric Characteristics of LaAlO3 Ceramics by Mechanochemical Treatment from La2O3-A12O3 and La2O3-Al(OH)3  

최상수 (부경대학교 전자공학과)
조정호 (부경대학교 전자공학과)
김강언 (부경대학교 전자공학과)
정수태 (부경대학교 전자공학과)
조상희 (경북대학교 무기재료공학과)
Publication Information
Journal of the Korean Ceramic Society / v.39, no.1, 2002 , pp. 68-73 More about this Journal
Abstract
The dielectric properties and synthesis of $LaAlO_3$ ceramics from mixtures of $La_2O_3-Al_2O_3$ (LAO) and $La_2O_3-Al(OH)_3$(LAH) via grinding process were investigated. The single phase $LaA1O_3$of LAO and LAH powders were formed at $1300^{\circ}C$ and $1000^{\circ}C$, respectively. A non-reacted $La_2O_3$ 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 $1400^{\circ}C$ 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.
Keywords
$LaA1O_3$; Mechanochemical; Dielectric constant; Dielectric loss;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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