“…Indeed, studies on tungsten-doped copper molybdate CuMo 1-x W x O 4 have shown that the tungsten content can control the temperature or pressure of the α γ phase transition in this molybdate. As these two polymorphic varieties are of different colors (green and ocher, respectively), considering the use of this material as an indicator of temperature or pressure is thus possible [6][7][8][9]. Recently, the work carried out in our laboratory by H. Lakhlifi et al [10][11][12] showed that the partial substitution of cation A in the matrix of A 1-x Co x MoO 4 (A=Zn and Mg) by the chromophoric element cobalt allows the synthesis of new colored materials.…”