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Enthalpies of Formation of LaMO3 Perovskites (M = Cr, Fe, Co, and Ni)

Published online by Cambridge University Press:  03 March 2011

Jihong Cheng ,
Alexandra Navrotsky ,
Xiao-Dong Zhou  and
Harlan U. Anderson
Jihong Cheng
Affiliation:
Thermochemistry Facility and NEAT ORU, University of California at Davis, Davis, California 95616
Alexandra Navrotsky*
Affiliation:
Thermochemistry Facility and NEAT ORU, University of California at Davis, Davis, California 95616
Xiao-Dong Zhou
Affiliation:
Electronic Materials Applied Research Center, University of Missouri–Rolla, Rolla, Missouri 65401
Harlan U. Anderson
Affiliation:
Electronic Materials Applied Research Center, University of Missouri–Rolla, Rolla, Missouri 65401
*
a)Address all correspondence to this author. e-mail: anavrotsky@ucdavis.edu
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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 LaMO3 (M = Cr, Fe, Co, and Ni). The enthalpies of formation of LaCrO3 and LaFeO3 from oxides (La2O3 and Cr2O3 or Fe2O3) are –70.06 ± 2.79 kJ/mol and –64.58 ± 2.32 kJ/mol, respectively. The enthalpies of formation of LaCoO3 and LaNiO3 from oxides (La2O3 and CoO or NiO) and O2 are −107.64 ± 1.77 kJ/mol and –57.31 ± 2.55 kJ/mol, respectively. All these data are evaluated and found to be consistent with literature values obtained using other methods. The relative stability among these four perovskites decreases in the order of Cr, Fe, Co, Ni.

Keywords

CalorimetryThermodynamic propertiesStability
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 1 , January 2005 , pp. 191 - 200
Copyright
Copyright © Materials Research Society 2004

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