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The energetics of La4LiAuO8

Published online by Cambridge University Press:  24 May 2011

Tori Z. Forbes ,
Joshua A. Kurzman ,
Ram Seshadri  and
Alexandra Navrotsky
Tori Z. Forbes
Affiliation:
Peter A. Rock Thermochemistry Laboratory and NEAT ORU (Nanomaterials in the Environment, Agriculture, and Technology Organized Research Unit), University of California, Davis, California 95616
Joshua A. Kurzman
Affiliation:
Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106
Ram Seshadri
Affiliation:
Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106; and Materials Department and Materials Research Laboratory, University of California, Santa Barbara, California 93106
Alexandra Navrotsky*
Affiliation:
Peter A. Rock Thermochemistry Laboratory and NEAT ORU (Nanomaterials in the Environment, Agriculture, and Technology Organized Research Unit), University of California, Davis, California 95616
*
b)Address all correspondence to this author. e-mail: anavrotsky@ucdavis.edu
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Abstract

La4LiAuO8 is a stable Au3+ oxide that was recently examined as a possible model compound for the role of Au3+ in heterogeneous catalysis. Due to the paucity of thermodynamic data, the energetics of La4LiAuO8 and its likely decomposition product, LiLaO2, were investigated. The ΔHf−ox, of La4LiAuO8 and LaLiO2 are both exothermic at −187.7 ± 5.8 and −41.4 ± 9.6 kJ/mol, respectively. From the thermodynamic data, the decomposition temperature of La4LiAuO8 was calculated as either 979 ± 95 or 1331 ± 43 °C for the formation of LiLaO2 or Li2O, respectively. Thus, LiLaO2 is the expected decomposition product.

Keywords

CalorimetryAuOxide
Type
Materials Communications
Information
Journal of Materials Research , Volume 26 , Issue 10 , 28 May 2011 , pp. 1188 - 1192
Copyright
Copyright © Materials Research Society 2011

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