Abstract

BETANCOURT, L; SAGREDO, V; RINCON, C  and  DELGADO, G.E. Absorción óptica y dependencia de la brecha de energía con la temperatura en monocristales del sistema Cd_1-xMn_xIn₂S₄. Rev. mex. fis. [online]. 2006, vol.52, suppl.3, pp.164-166. ISSN 0035-001X.

The optical properties of spinel single crystals of Cd_1-xMn_xIn₂S₄ (x=1.0; 0.8) have been studied by optical absorption technique. From the analysis of the experimental data, it was found that the band gap energy E_g of MnIn₂S₄ (x = 1.0), varies from 2.012 to 1.898 eV between 9 and 300 K. The temperature dependence of E_g, was analyzed by considering two theoretical models reported in the literature. The best fit was obtained by using an expression proposed by Passler. The Debye temperature of MnIn₂S₄ was estimated to be around 153 K, that correspond to an effective phonon energy _ef f = K_Bθ 10 meV for this compound.

Keywords : Spinel; ternary semiconductor; optical absorption; Debye temperature.