NDLI: Thermal expansion of bismuth telluride

Content Provider	Springer Nature Link
Author	Pavlova, L. M. Shtern, Yu. I. Mirov, R. E.
Copyright Year	2011
Abstract	The results of X-ray and dilatometric measurements of the thermal expansion of bismuth telluride in the temperature range of 4.2–850 K have been critically analyzed. The joint statistical processing of the experimental data has been performed by the least squares method and the most reliable temperature dependences of the linear thermal expansion coefficients along the principal crystallographic axes αa and αc and the average linear coefficient $\bar \alpha _L $ , as well as the density of Bi2Te3, have been recommended. The results indicate that the linear thermal expansion coefficients along the directions parallel and perpendicular to the cleavage planes decrease with an increase in the temperature in a narrow temperature range. At temperatures below 298 K, the character of the temperature dependences of the linear thermal expansion coefficients of Bi2Te3 has been analyzed in terms of the anharmonicity of the chemical bonding forces in the layer structure and anisotropy of the elastic constants. In terms of the deviations of the composition of the Bi2Te3 compound from the stoichiometric one and the real (defect) structure of the compound, a model has been proposed to explain the minimum in the (αa T) dependence of Bi2Te3 near the melting temperature of bismuth. A method for calculating the temperature dependence of the linear thermal expansion coefficients of the anisotropic layer crystals using the data on the specific heat has been discussed, which provides good agreement of the calculated linear thermal expansion coefficients with the experimental data within the accuracy of the measurements of the linear thermal expansion coefficients.
Starting Page	369
Ending Page	379
Page Count	11
File Format	PDF
ISSN	0018151X
Journal	High Temperature
Volume Number	49
Issue Number	3
e-ISSN	16083156
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-06-11
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Industrial Chemistry/Chemical Engineering Materials Science Atoms and Molecules in Strong Fields, Laser Matter Interaction Classical Continuum Physics
Content Type	Text
Resource Type	Article
Subject	Engineering Condensed Matter Physics

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