Formation enthalpies of LaLn׳O3 (Ln׳=Ho, Er, Tm and Yb) interlanthanide perovskites

Jianqi Qi; Xiaofeng Guo; Aleksandra Dorota Mielewczyk-Gryń; Alexandra Navrotsky

doi:10.1016/j.jssc.2015.03.026

Formation enthalpies of LaLn׳O3 (Ln׳=Ho, Er, Tm and Yb) interlanthanide perovskites

Abstract

High-temperature oxide melt solution calorimetry using 3Na2O·MoO3 at 802 °C was performed for interlanthanide perovskites LaLn׳O3 (Ln׳=Ho, Er, Tm and Yb) and lanthanide oxides (La2O3, Ho2O3, Er2O3, Tm2O3 and Yb2O3). The enthalpies of formation of these interlanthanide perovskites from binary lanthanide oxides at room temperature (25 °C) were determined to be −8.3±3.4 kJ/mol for LaHoO3, −9.9±3.0 kJ/mol for LaErO3, −10.8±2.7 kJ/mol for LaTmO3 and −12.3±2.9 kJ/mol for LaYbO3. There is a roughly linear relationships between these enthalpy values and the tolerance factor for these and for other LaM3+O3 (M=In, Sc, Ga, Al, Fe and Cr) perovskites, confirming that the distortion of the perovskites as results from ionic radius difference of A-site and B-site cations, is the main factor determining the stability of these compounds.

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Authors (4)

Jianqi Qi
- Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California, Davis, CA 95616 USA College of Physical Science and Technology, Sichuan University, Chengdu 610064, PR China
Xiaofeng Guo
- Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California, Davis, CA 95616 USA Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California, Davis, CA 95616 USA
Aleksandra Dorota Mielewczyk-Gryń dr hab. inż.
Alexandra Navrotsky
- Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California, Davis, CA 95616 USA Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California, Davis, CA 95616 USA

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Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: JOURNAL OF SOLID STATE CHEMISTRY no. 227, pages 150 - 154,
ISSN: 0022-4596
Language:: English
Publication year:: 2015
Bibliographic description:: Qi J., Guo X., Mielewczyk-Gryń A., Navrotsky A.: Formation enthalpies of LaLn׳O3 (Ln׳=Ho, Er, Tm and Yb) interlanthanide perovskites// JOURNAL OF SOLID STATE CHEMISTRY. -Vol. 227, (2015), s.150-154
DOI:: Digital Object Identifier (open in new tab) 10.1016/j.jssc.2015.03.026
Verified by:: Gdańsk University of Technology