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Direct measurements of fusion and phase transition enthalpies in lanthanum oxide

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Abstract

Enthalpies of high-temperature phase transitions and fusion in lanthanum oxide (La2O3) 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 Al2O3. Transformation enthalpy of La2O3 from A to H phase is 23 ± 5 kJ/mol at 2046 ± 5 °C and from H to X phase is 17 ± 5 kJ/mol at 2114 ± 5 °C. Lanthanum oxide melts at 2301 ± 10 °C, with enthalpy of fusion of 78 ± 10 kJ/mol.

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Acknowledgment

This work was supported by the U.S. Department of Energy, Grant DE-FG02-03ER46053.

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Authors and Affiliations

  1. Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California at Davis, Davis, California, 95616, USA

    Sergey V. Ushakov & Alexandra Navrotsky

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  1. Sergey V. Ushakov
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  2. Alexandra Navrotsky
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Correspondence to Sergey V. Ushakov.

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Ushakov, S.V., Navrotsky, A. Direct measurements of fusion and phase transition enthalpies in lanthanum oxide. Journal of Materials Research 26, 845–847 (2011). https://doi.org/10.1557/jmr.2010.79

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  • DOI: https://doi.org/10.1557/jmr.2010.79

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