Direct Measurement of Fusion Enthalpy of LaAlO3 and Comparison of Energetics of Melt, Glass, and Amorphous Thin Films
Direct Measurement of Fusion Enthalpy of LaAlO3 and Comparison of Energetics of Melt, Glass, and Amorphous Thin Films
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直接测量 LaAlO3 的熔化焓以及熔体、玻璃和非晶薄膜的能量学比较
DOI：
10.1111/jace.12785
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发表时间：
2014
影响因子：
3.9
通讯作者：
A. Navrotsky
中科院分区：
文献类型：
--
作者：
S. Ushakov;A. Navrotsky
热分析法测得钙钛矿LaAlO3在2134±10℃时的熔合焓和熔合温度为124±10 kJ/mol，得到熔合熵为52±4 J·（mol·K）−1。非晶LaAlO3薄膜的结晶焓从−24 ~−17 kJ/mol变化，薄膜厚度从100 ~ 20 nm减小。非晶LaAlO3薄膜和玻璃的能量学差异不能完全用表面能贡献来解释，而必须反映在该体系中薄膜和玻璃之间的结构差异。
Enthalpy of fusion and melting temperature of perovskite LaAlO3 were measured using thermal analysis method as 124 ± 10 kJ/mol at 2134 ± 10°C, providing a value of 52 ± 4 J·(mol·K)−1 for entropy of fusion. Crystallization enthalpy of amorphous LaAlO3 thin films was found to change from −24 to −17 kJ/mol with decrease in film thickness from 100 to 20 nm. Differences in energetics of amorphous LaAlO3 films and glass cannot be explained exclusively by surface energy contribution but must reflect differences in structure between films and glasses in this system.