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- In this work Cd4GeSe6 and Cd4GeSe6:Co2+ single crystals were grown by the chemical transport reaction method and the structure of Cd4GeSe6 and Cd4GeSe6:Co2+ single crystals were monoclinic structure. The temperature dependence of optical energy gap was fitted well to Varshni equation. Also, the entropy, enthalpy and heat capacity were deduced from the temperature dependence of optical energy gap.