Direct measurements of fusion and phase transition enthalpies in lanthanum oxide

作者：Ushakov Sergey V^*; Navrotsky Alexandra

来源：Journal of Materials Research, 2011, 26(7): 845-847.

DOI：10.1557/jmr.2010.79

Enthalpies of high-temperature phase transitions and fusion in lanthanum oxide (La(2)O(3)) were directly measured for the first time. Three samples were prepared by laser melting, sealed in tungsten crucibles, and heated in a differential thermal analyzer calibrated by melting Al(2)O(3). Transformation enthalpy of La(2)O(3) from A to H phase is 23 +/- 5 kJ/mol at 2046 +/- 5 degrees C and from H to X phase is 17 +/- 5 kJ/mol at 2114 +/- 5 degrees C. Lanthanum oxide melts at 2301 +/- 10 degrees C, with enthalpy of fusion of 78 +/- 10 kJ/mol.

• 出版日期2011-4