Molybdenum or tungsten containing bismuth vanadate yellow pigments and process for preparing same

摘要

This invention relates to new inorganic yellow pigments consisting or consisting essentially of Bi1-(x/3) Mx V1-x O4 in which M is Mo or W. The value of x varies from 0.075 to 0.317 in the case of Mo and from 0.059 to 0.265 in the case of W. These pigments are composed of only the tetragonal crystalline phase of the scheelite type when M is Mo; when M is W, also the orthorhombic crystalline phase gamma Bi2WO6 is present. These pigments may also contain a crystalline phase consisting of orthorhombic BaSO4; in such case the amount of BaSO4 may reach 80% by weight of the pigment.