Microhardness of single crystals of paratellurite

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Abstract

The values of microhardness of samples of single crystals of paratellurite differing from each other in growth conditions and structural quality were measured. For the plane (110), these values lie in the range — 300—470 kG/mm2. It has been determined that mechanical stresses in paratellurite can lead to significant deviations of values of microhardness from average values.

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About the authors

S. V. Molchanov

Tver State University

Email: Tretyakov.SA@tversu.ru
Russian Federation, Tver

S. A. Tretiakov

Tver State University

Author for correspondence.
Email: Tretyakov.SA@tversu.ru
Russian Federation, Tver

I. A. Kaplunov

Tver State University

Email: Tretyakov.SA@tversu.ru
Russian Federation, Tver

A. I. Ivanova

Tver State University

Email: Tretyakov.SA@tversu.ru
Russian Federation, Tver

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2. Fig. 1. Growth parameters of paratellurite single crystals No. 1 and No. 2: time dependences of crystal diameter (a); changes in growth rate (b); changes in temperature gradient in the melt (c); changes in the ratio of similarity criteria (d).

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3. Fig. 2. Samples of single-crystal paratellurite for measurements (a). Pits from the indenter on sample No. 1 (b) and No. 2 (c). Microhardness measured along the radii in the corresponding directions on sample No. 1 (d) and No. 2 (d).

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4. Fig. 3. Conoscopic images of paratellurite single crystals in the region of maximum mechanical stress: a — sample No. 1; b — sample No. 2.

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5. Fig. 4. Transmission coefficients obtained on paratellurite samples along the radii in the corresponding directions.

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