Inorganic blue pigments from cobalt doped magnesium having transition element oxides and a process for preparing the same

Padala Prabhakar Rao, Saraswathy Divya

The present invention relates to a new Inorganic Blue pigments from Cobalt doped Magnesium having Transition Element Oxides and a process for the preparing the same. The present invention more particularly relates to the devel opment of blue pigments, comprising oxides of alkaline earth, and transition metals of the general formula Mg. aCo., WO (x=0.1 to 0.5), MgCoN-bO (x=0.1 to 0.5), and MgCo TiO (x=0.1 to 0.5) and well suited for colouring applications of a wide variety of Substrates for example paints, varnishes, plastics, ceramics etc. Raw materials such as MgO, CoO and one of WO, TiO, NbOs and are weighted in the stoichiometric ratio and calcined in the range 1100-1300° C. for 6-12 hrs duration in air atmosphere. The well ground calcined powders were used for character ization of the pigments. The phase purity and optical prop erties of the prepared pigments were investigated.