Abstract
Electrical conductivity and thermoelectric power measurements as a function of temperature have been carried out on Ag2Te thin films of different thicknesses prepared on glass substrates at room temperature in a vacuum of 5×10−5 Torr. It is found that the phase transition temperatures (located by a steep change in resistance and thermoelectric power with temperature) during heating and cooling are different, thereby showing a thermal hysteresis during the phase transition. It is also found that the magnitude of the hysteresis is a function of thickness, increasing with decreasing thickness. This can be due to the large surface-to-volume ratio, small grain size, and a large density of dislocations in thin films.
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