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

Leonid Vasylechko; Olha Pekinchak; Vasyl Hreb; Yurii Prots; Dmitry Chernyshov; Andy Fitch

doi:10.4028/www.scientific.net/SSP.257.99

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

Abstract:

Series of the mixed cobaltites-ferrites RCo₁₋_xFe_xO₃ (x = 0.1–0.9) and cobaltites-chromites RCo_0.5Cr_0.5O₃ (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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Solid State Phenomena (Volume 257)

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99-102

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.257.99

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Online since:

October 2016

Authors:

Leonid Vasylechko, Olha Pekinchak, Vasyl Hreb, Yurii Prots*, Dmitry Chernyshov, Andy Fitch

Keywords:

Crystal Structure, Mixed Cobaltites-Chromites, Mixed Cobaltites-Ferrites, Perovskites, Solid Solution, Spin State Transitions, Synchrotron Radiation, Thermal Expansion

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