a b s t r a c tThe AgGaSe 2 as well as AgGaS 2 has been showed to be efficient frequency doubling crystals for infrared radiation such as the 10.6 m CO 2 laser. The production of these crystals needs good knowledge of the phase relationship. The thermodynamic description of the binary Ag-Ga system has been chosen as a first step for the description of the Ag-Ga-Se and Ag-Ga-S systems. The Calphad approach has been used for this modeling. Good agreement between experimental data and calculated values has been found.

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