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Direct Measurement of Fusion Enthalpy of LaAlO 3 and Comparison of Energetics of Melt, Glass, and Amorphous Thin Films
Author(s) -
Ushakov Sergey V.,
Navrotsky Alexandra
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12785
Subject(s) - enthalpy , fusion , amorphous solid , enthalpy of fusion , crystallization , thin film , materials science , thermodynamics , analytical chemistry (journal) , crystallography , chemistry , melting point , nanotechnology , composite material , physics , linguistics , philosophy , chromatography
Enthalpy of fusion and melting temperature of perovskite LaAlO 3 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 LaAlO 3 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 LaAlO 3 films and glass cannot be explained exclusively by surface energy contribution but must reflect differences in structure between films and glasses in this system.