Abstract
Ag In 5 Te 8 was prepared by direct fusion of the stoichiometric mixture of the elements in an evacuated quartz ampoule. The analysis of x-ray powder diffraction data showed the presence of one single phase with tetragonal structure. The lattice parameters a=6.212Å and c=12.456Å were refined by means of the program WINPLOTR. Congruent fusion at 698°C was observed by differential thermal analysis measurements performed on samples sealed in evacuated quartz ampoules. Transmittance measurements were used to determine the absorption coefficient α. Two absorption edges were observed, one indirect at 1.1eV and one direct at 1.28eV, obtained from a plot of (α×hν)1∕2 vs hν and (α×hν)2 vs hν, respectively. A six-probe configuration was used to measure the electrical resistivity and the Hall coefficient from 10to400K. The activation energies values, estimated at 1.1 and 1.27eV from Arrhenius plots of the resistivity and the Hall coefficient, respectively, agree with those obtained for the energy gaps by optical measurements.
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