Preparation and thermophysical properties of AgGaTe 2 crystals
Abstract
The preparation and thermophysical properties of AgGaTe2 crystals are reported. The synthesis from pure elements was performed in a rocking oven and scanning electron microscopy and energy dispersive X-ray elemental analysis show the presence of additional phases. From simultaneous differential calorimetry and thermogravimetric analysis (SDT) measurements we have found that AgGaTe2 melts at 725.7°C, with a heat of fusion of 104.8 J/g-1. High temperature powder X-ray diffraction data confirmed the chalcopyrite structure and yielded the thermal expansion coefficients along the a- and c-axes to 500°C. Heating above that temperature, under inert gas flow, causes the material to sublime incongruently and produce a film of gallium rich surface. Experimental values of thermal diffusivity and estimates of the thermal conductivity values are also presented.
- Publication:
-
Journal of Crystal Growth
- Pub Date:
- May 2001
- DOI:
- 10.1016/S0022-0248(01)00957-5
- Bibcode:
- 2001JCrGr.225..505B