The structure and thermal properties of tmfe2o4 at different values of temperature and oxygen pressure

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Abstract

The stability range of TmFe2O4 has been studied under conditions of low oxygen pressure in the gas phase at the temperature of 1090 °C. The thermodynamic characteristics of thulium ferrite are calculated from experimental data obtained during dissociation of the compound in the temperature range of 750–900 °C. Structural transformations are determined in the temperature range from –140 to 140 °C. They are associated with charge ordering in this compound.

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About the authors

L. B. Vedmid

Institute of Metallurgy, Ural Branch of the Russian Academy of Sciences; Ural Federal University

Author for correspondence.
Email: elarisa100@mail.ru
Russian Federation, Ekaterinburg

O. M. Fedorova

Institute of Metallurgy, Ural Branch of the Russian Academy of Sciences

Email: elarisa100@mail.ru
Russian Federation, Ekaterinburg

V. M. Dimitrov

Institute of Metallurgy, Ural Branch of the Russian Academy of Sciences

Email: elarisa100@mail.ru
Russian Federation, Ekaterinburg

V. F. Balakirev

Institute of Metallurgy, Ural Branch of the Russian Academy of Sciences

Email: elarisa100@mail.ru
Russian Federation, Ekaterinburg

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2. Fig. 1. Temperature dependence of the parameters of the unit cell TmFe2O4.

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3. Fig. 2. Temperature dependence of the Tm – O2, Fe – O1 (apical), Fe – O2 (apical) bond lengths of TmFe2O4. The error in determining the lengths of the links is equal to the size of the symbol.

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4. Fig. 3. DSC measurement curve of the TmFe2O4 compound.

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5. Fig. 4. Temperature dependence of the equilibrium oxygen partial pressure during dissociation of the TmFe2O4 compound, 1 — our data, 2 — data [4].

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