Geodesic
Heat capacity and defects of vanadium trioxide lattice
Matematičeskaâ fizika i kompʹûternoe modelirovanie, Tome 20 (2017) no. 6, pp. 83-88.

Voir la notice de l'article provenant de la source Math-Net.Ru

We report the results of studying the heat capacity of samples V$_{2}$O$_{3}$, V$_{2}$O$_{3,04}$, 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 $\sim 1 \%$. 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.
Keywords: heat capacity, vanadium trioxide, metal-insulator phase transition, lattice defects, concentration of defects, Debye temperature. 
@article{VVGUM_2017_20_6_a7,
     author = {Vad. I. Surikov and Val. I. Surikov and S. V. Danilov and V. A. Egorova and N. G. Eysmont and N. A. Semenyuk},
     title = {Heat capacity and defects of vanadium trioxide lattice},
     journal = {Matemati\v{c}eska\^a fizika i kompʹ\^uternoe modelirovanie},
     pages = {83--88},
     publisher = {mathdoc},
     volume = {20},
     number = {6},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VVGUM_2017_20_6_a7/}
}
TY  - JOUR
AU  - Vad. I. Surikov
AU  - Val. I. Surikov
AU  - S. V. Danilov
AU  - V. A. Egorova
AU  - N. G. Eysmont
AU  - N. A. Semenyuk
TI  - Heat capacity and defects of vanadium trioxide lattice
JO  - Matematičeskaâ fizika i kompʹûternoe modelirovanie
PY  - 2017
SP  - 83
EP  - 88
VL  - 20
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/VVGUM_2017_20_6_a7/
LA  - ru
ID  - VVGUM_2017_20_6_a7
ER  - 
%0 Journal Article
%A Vad. I. Surikov
%A Val. I. Surikov
%A S. V. Danilov
%A V. A. Egorova
%A N. G. Eysmont
%A N. A. Semenyuk
%T Heat capacity and defects of vanadium trioxide lattice
%J Matematičeskaâ fizika i kompʹûternoe modelirovanie
%D 2017
%P 83-88
%V 20
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/VVGUM_2017_20_6_a7/
%G ru
%F VVGUM_2017_20_6_a7
Vad. I. Surikov; Val. I. Surikov; S. V. Danilov; V. A. Egorova; N. G. Eysmont; N. A. Semenyuk. Heat capacity and defects of vanadium trioxide lattice. Matematičeskaâ fizika i kompʹûternoe modelirovanie, Tome 20 (2017) no. 6, pp. 83-88. http://geodesic.mathdoc.fr/item/VVGUM_2017_20_6_a7/

[1] Vad. I. Surikov, Val. I. Surikov, O. V. Lyakh, S. V. Daniov, “Defects of the Crystal Structure of Vanadium Dioxide”, News of Higher Educational Institutions. Physics, 57:8 (2014), 96–99

[2] I. M. Lifshits, “On the Thermal Properties of Chain and Layered Structures at Low Temperatures”, Journal of Experimental and Theoretical Physics, 22:4 (1952), 475–486

[3] N. F. Mott, Metal-Insulator Transitions, Nauka Publ., Moscow, 1979, 342 pp.

[4] P. V. Geld, G. I. Kalishevich, V. I. Surikov, A. K. Shtolts, V. L. Zagryazhskiy, “The Heat Capacity of the Silicides and Germanides of Vanadium and Chromium with A-15 Structure”, Reports of the USSR Academy of Sciences, 215:4 (1974), 833–835

[5] S. V. Danilov, Vad. I. Surikov, Val. I. Surikov, N. I. Kourov, “The Heat Capacity of Vanadium Trioxide at Liquid Helium Temperature”, Solid State Physics, 25:9 (1983), 2772–2773