Surikov V.I., Surikov V.I., Danilov S.V., Egorova V.A., Eysmont N.G., Semenyuk N.A. Heat Capacity and Defects of Vanadium Trioxide Lattice

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https://doi.org/10.15688/mpcm.jvolsu.2017.6.8

Vadim Ivanovich  Surikov
Candidate of Physical and Mathematical Sciences, Professor, Department of Physics,
Omsk State Technical University
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Prosp. Mira, 11, 644050 Omsk, Russian Federation

Valeriy Ivanovich  Surikov
Doctor of Technical Sciences, Professor, Department of Physics,
Omsk State Technical University
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Prosp. Mira, 11, 644050 Omsk, Russian Federation

Sergey Valentinovich  Danilov
Candidate of Technical Sciences, Associate Professor, Department of Physics,
Omsk State Technical University
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Prosp. Mira, 11, 644050 Omsk, Russian Federation

Viktoriya Aleksandrovna Egorova
Candidate of Technical Sciences, Associate Professor, Department of Physics,
Omsk State Technical University
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Prosp. Mira, 11, 644050 Omsk, Russian Federation

Natalya Gennadyevna Eysmont
Candidate of Pedagogical Sciences, Associate Professor, Department of Physics,
Omsk State Technical University
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Prosp. Mira, 11, 644050 Omsk, Russian Federation

Natalya Andreevna Semenyuk
Senior Lecturer, Department of Physics,
Omsk State Technical University
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Prosp. Mira, 11, 644050 Omsk, Russian Federation

Abstract. We report the results of studying the heat capacity of samples V₂O₃ V₂O_3,04, of the region of homogeneity of vanadium trioxide in the temperature range 5–250 K. The samples obtained by reduction of vanadium pentoxide in an atmosphere of purified hydrogen at different temperatures  are  certified by X-ray  phase analysis  which  showed their singlephase nature. The oxygen content in the samples iss determined by the profits of weight at oxidation to the source vanadium  pentoxide, as well as by means of the scanning electron microscope JEOL JCM-5700. The temperature dependence of the heat capacity is analyzed using an automated vacuum adiabatic calorimeter with an accuracy of ~1 %. Analysis of the results  obtained  in  the  region  of  helium  temperatures  allows  to  represent  the  temperature dependence of the heat capacity as a sum of two terms, one of which corresponds to the heat capacity of the crystal lattice (the Debye T3 law), and the second exponential term is interpreted as the heat capacity of crystal lattice defects. Mathematical processing of the results allows to estimate  some parameters of  these compounds, in  particular of the  Debye temperature, excitation energy and concentration of defects in the crystal lattice of the synthesized samples. The  conclusion is made about the increase of defect concentration with increasing oxygen content in the samples, which leads to changes in the phonon spectrum, which is expressed in particular in a significant change of Debye temperature.

Key words: heat capacity, vanadium trioxide, metal-insulator phase transition, lattice defects,  concentration  of defects,  Debye  temperature.

Heat Capacity and Defects of Vanadium Trioxide Lattice by Surikov V.I., Surikov V.I., Danilov S.V., Egorova V.A., Eysmont N.G., Semenyuk N.A. is licensed under a Creative Commons Attribution 4.0 International License.

Citation in English: Mathematical Physics and Computer Simulation. Vol. 20 No. 6 2017 pp. 83-88

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