Crystal data for AgGa_xIn_1−xSe₂ and CuGa_xIn_1−xSe₂

Series of chalcopyrite-type solid solutions AgGa_xIn_1−xSe₂ and CuGa_xIn_1−xSe₂, 0≤x≤1, have been prepared by direct synthesis from the melt. The space group is I2d (No. 122), Z = 4. The unit-cell parameters a and c and the ratio c/a change linearly with x. Powder data at 298 K are given for AgGaSe₂, AgGa_0.80In_0.20Se₂, AgGa_0.70In_0.30Se₂, AgGa_0.40In_0.60Se₂, AgGa_0.20In_0.80Se₂ and AgInSe₂, and for CuGaSe₂, CuGa_0.60In_0.40Se₂, CuGa_0.30In_0.70Se₂ and CuInSe₂.