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The elastic properties of lead sulfur selenium are studied using first-principles calculations. The geometry optimized structural parameters for PbS 0.5 Se 0.5 under different pressures are listed. The lattice parameter increase with increasing pressure, but enthalpy is constant. However, parameter B and Y decrease and parameter S increase with increasing pressure. The elastic constants satisfy the traditional mechanical stability conditions for these ternary mixed crystals. The elastic modulus as two functions of pressure from 0 -10 GPa are obtained. The calculated elastic constants C ij decrease but with different rates under increasing pressure.

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