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

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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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  1. Thermochemistry Facility and NEAT ORU, University of California at Davis, One Shields Avenue, 95616, Davis, California, USA

    Jihong Cheng & Alexandra Navrotsky

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  1. Jihong Cheng
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  2. Alexandra Navrotsky
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Correspondence to Alexandra Navrotsky.

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Cheng, J., Navrotsky, A. Enthalpies of formation of LaBO3 perovskites (B = Al, Ga, Sc, and In). Journal of Materials Research 18, 2501–2508 (2003). https://doi.org/10.1557/JMR.2003.0348

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  • DOI: https://doi.org/10.1557/JMR.2003.0348

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