Absorption edge and phase р,Т-diagram of ferrielectrics CuInP<sub>2</sub>(Se<sub>0.1</sub>S<sub>0.9</sub>)<sub>6</sub>
В. Ю. БіганичІ. Ю. КурицяВ. С. ШустаО. І. Герзанич
Abstract
Influence of temperature and hydrostatic pressure upon the edge of optical absorption of ferrielectric crystals CuInP 2 (Se 0.1 S 0.9 ) 6 have been under investigation in the present research. It is registered that absorption edge is formed in high-energetic part according to the rule of Urbakh, and in low-energetic – indirect optical transitions. The energy of phonons are determined that participate in formation of absorption edge. In accordance with detected anomalies absorption edge near the phase transition at different pressures and temperatures p,T -diagram of crystal CuInP 2 (Se 0.1 S 0.9 ) 6 is built. It testifies about appliance of phase transition to transition of order-disorder-type.
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