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  Anomalous Thermal Behaviour of Mixed Cobaltites-Ferrites and Cobaltites-Chromites

Vasylechko, L., Pekinchak, O., Hreb, V., Prots, Y., Chernyshov, D., & Fitch, A. (2017). Anomalous Thermal Behaviour of Mixed Cobaltites-Ferrites and Cobaltites-Chromites. Solid State Phenomena, 257, 99-102. doi:10.4028/www.scientific.net/SSP.257.99.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-C286-B Version Permalink: http://hdl.handle.net/21.11116/0000-0002-E22A-0
Genre: Journal Article

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 Creators:
Vasylechko, Leonid1, Author
Pekinchak, Olha1, Author
Hreb, Vasyl1, Author
Prots, Yurii2, Author              
Chernyshov, Dmitry1, Author
Fitch, Andrew1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Yuri Prots, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863424              

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Free keywords: Crystal Structure, Mixed Cobaltites-Chromites, Mixed Cobaltites-Ferrites, Perovskites, Solid Solution, Spin State Transitions, Synchrotron Radiation, Thermal Expansion
 Abstract: Series of the mixed cobaltites-ferrites RCo1−xFexO3 (x = 0.1–0.9) and cobaltites-chromites RCo0.5Cr0.5O3 (R = Pr, Nd, Sm, Eu, Gd, Tb, Dy, Er) with the orthorhombic perovskite structure (space group Pbnm) have been prepared from stoichiometric amounts of rare earth oxides, Co3O4, Fe2O3 and Cr2O3 by solid-state reaction in air at 1473–1573 K. In situ high-temperature X-ray synchrotron powder diffraction revealed anomalous lattice expansion of both series, which is reflected in a sigmoidal dependence of the unit cell dimensions and in abnormal anisotropic increase of the thermal expansion coefficients (TEC). Depending on the composition, several broad maxima in the temperature range of 500−1000 K are observed, which are evidently connected with the transitions of Co3+ cations to the higher spin states. The observed anomalies in the mixed cobaltites-ferrites and cobaltites-chromites are less pronounced compared with the corresponding “pure” cobaltites.

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Language(s): eng - English
 Dates: 2017-01-192017-01-19
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Degree: -

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Title: Solid State Phenomena
Source Genre: Journal
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Publ. Info: Vaduz, Liechtenstein : Sci-Tech Publications
Pages: - Volume / Issue: 257 Sequence Number: - Start / End Page: 99 - 102 Identifier: ISSN: 1012-0394
CoNE: https://pure.mpg.de/cone/journals/resource/954928607148