Direct measurements of fusion and phase transition enthalpies in lanthanum oxide

Sergey V. Ushakov; Alexandra Navrotsky

doi:10.1557/jmr.2010.79

Direct measurements of fusion and phase transition enthalpies in lanthanum oxide

Sergey V. Ushakov, Alexandra Navrotsky

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

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 Al ₂O₃. Transformation enthalpy of La₂O ₃ 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.

Original language	English (US)
Pages (from-to)	845-847
Number of pages	3
Journal	Journal of Materials Research
Volume	26
Issue number	7
DOIs	https://doi.org/10.1557/jmr.2010.79
State	Published - Apr 14 2011
Externally published	Yes

Keywords

Calorimetry
Phase Equilibria
Phase Transformation

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "Direct measurements of fusion and phase transition enthalpies in lanthanum oxide",

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 Al 2O3. Transformation enthalpy of La2O 3 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.",

keywords = "Calorimetry, Phase Equilibria, Phase Transformation",

author = "Ushakov, {Sergey V.} and Alexandra Navrotsky",

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doi = "10.1557/jmr.2010.79",

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T1 - Direct measurements of fusion and phase transition enthalpies in lanthanum oxide

AU - Ushakov, Sergey V.

AU - Navrotsky, Alexandra

PY - 2011/4/14

Y1 - 2011/4/14

N2 - 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 Al 2O3. Transformation enthalpy of La2O 3 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.

AB - 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 Al 2O3. Transformation enthalpy of La2O 3 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.

KW - Calorimetry

KW - Phase Equilibria

KW - Phase Transformation

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Direct measurements of fusion and phase transition enthalpies in lanthanum oxide

Abstract

Keywords

ASJC Scopus subject areas

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