ABO 4 type scheelite phases in (Ca/Sr)MoO 4 - BiVO 4 - Bi 2 Mo 3 O 12 systems: synthesis, structure and optical properties

The cation deficient complex oxides of (Ca/Sr)MoO 4 - BiVO 4 - Bi 2 Mo 3 O 12 triple system are promising photocatalysts and pigments. Compounds with general formula of Ca 1−1.5 x-y Bi x+y Ф x Mo 1-y V y O 4  and Sr 1−1.5 x-y Bi x+y Ф x Mo 1-y V y O 4 were synthesized byconvention solid state technique in the range of 550–720 °C. Two wide regions of the solid solutions (ordinary and superstructured scheelite-type phases respectively) were found for each system. The diffuse scatering of homogeneous samples was investigated in the range of 190–1100 nm. Energy gaps calculated with linear approximation of Kubelka-Munk function decreases with bismuth and vanadium content.