Analysis of composition and temperature dependence of some thermal transport properties in glassy Ge30−xSe70Snx alloys using transient plane source technique

Measurements of thermal transport properties such as effective thermal conductivity (λ e) and effective thermal diffusivity (k e) of Ge30−xSe70Snx (x = 8, 11, 14, 17, and 20) chalcogenide glasses have been made using transient plane source technique in temperature range from room temperature to 300 °C. Both effective thermal conductivity (λ e) and effective thermal diffusivity (k e) are almost constant in the temperature range from room temperature to 240 °C. Beyond 240 °C, both λ e and k e increase with the increase in temperature and show maxima at a particular temperature which is a characteristic temperature for a given material. For further increase in temperature, both λ e and k e decrease slowly. Addition of Sn concentration in the glass increases the value of λ e and k e over the entire range of temperature under investigation for all five samples. Here, an effort has also been made to predict the values of both λ e and k e by using empirical relationships.