Enthalpies of formation of rare earth niobates, RE3NbO7

Aleksandra Dorota Mielewczyk-Gryń; Alexandra Navrotsky

doi:10.2138/am-2015-5210

Enthalpies of formation of rare earth niobates, RE3NbO7

Abstract

High-temperature oxide melt solution calorimetry was used to investigate energetics of a series of rare earth niobates RE3NbO7. All of investigated compounds were found to be stable in enthalpy in respect to their oxides. The enthalpy of formation from oxides becomes more exothermic as the size of the RE cation increases, a trend seen previously in other RE compounds including pyrochlores, perovskites, and phosphates. For smaller RE cations the enthalpy of exchange of RE between niobates and titanates is close to zero, whereas larger RE are energetically favored in the titanate pyrochlores. Implications of the results from the geochemical and material engineering points of view are discussed.

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Authors (2)

Aleksandra Dorota Mielewczyk-Gryń dr hab. inż.
Alexandra Navrotsky

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Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: AMERICAN MINERALOGIST no. 100, pages 1578 - 1583,
ISSN: 0003-004X
Language:: English
Publication year:: 2015
Bibliographic description:: Mielewczyk-Gryń A. D., Navrotsky A.: Enthalpies of formation of rare earth niobates, RE3NbO7// AMERICAN MINERALOGIST. -Vol. 100, iss. 7 (2015), s.1578-1583
DOI:: Digital Object Identifier (open in new tab) 10.2138/am-2015-5210
Verified by:: Gdańsk University of Technology