Physico-chemical Properties of Selenium-Tellurium-Sulfur Crystals

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The temperature dependence of electric conductivity and Vickers hardness of Selenium–Tellurium–Sulfur (Se–Te–S) crystals were studied. The conductivity decreased with an increase in sulfur content, remaining almost constant when the sulfur content was 40–80 atomic % at 20 and 30 atomic % of tellurium content. When tellurium content was 10%, both conductivity and hardness decreased abruptly when sulfur content exceeded 10%. It was found by means of X-ray diffraction that a hexagonal crystal structure with size twice the lattice constant of Se–Te crystals is formed when the sulfur content is 20% at 10% of tellurium content. When sulfur content exceeds 80%, the crystal structure becomes similar to that of pure sulfur (orthorhombic) at 20 and 30% of tellurium.
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