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Enthalpies of formation of LaBO3 perovskites (B = Al, Ga, Sc, and In)

Published online by Cambridge University Press:  03 March 2011

Jihong Cheng  and
Alexandra Navrotsky
Jihong Cheng
Affiliation:
Thermochemistry Facility and NEAT ORU, University of California at Davis, One Shields Avenue, Davis, California 95616
Alexandra Navrotsky*
Affiliation:
Thermochemistry Facility and NEAT ORU, University of California at Davis, One Shields Avenue, Davis, California 95616
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Enthalpies of formation from constituent oxides and elements at 298 K were determined by high-temperature oxide melt solution calorimetry for a group of technologically important perovskites LaBO3 (B = La, Ga, Sc, and In). Enthalpies of formation from oxides of LaAlO3 and LaGaO3 are −69.61 ± 3.23 kJ/mol and −52.39 ± 1.99 kJ/mol, respectively. The data were consistent with literature values obtained using other methods. The enthalpies of formation of LaScO3 and LaInO3 from oxides were reported for the first time as −38.64 ± 2.30 kJ/mol and −23.99 ± 2.31 kJ/mol, respectively. As seen for other perovskites, as the tolerance factor deviates more from unity (in the order Al, Ga, Sc, In), the enthalpy of formation from oxides becomes less exothermic, indicating a less stable structure with respect to the constituent oxides.

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Articles
Information
Journal of Materials Research , Volume 18 , Issue 10 , October 2003 , pp. 2501 - 2508
Copyright
Copyright © Materials Research Society 2003

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