Synthesis and study of a new class of red pigments based on perovskite YAlO3 structure

A red pigment has been prepared by substituting chromium ions in aluminum ion sites in YAlO₃ perovskite structure. In a first step, effect of various mineralizers on YAlO₃ formation has been investigated, which resulted in decrease of formation temperature down to 1400 °C. In the next step, a red pigment corresponding to YAl_1−yCr_yO₃ (y = 0.05), has been prepared by heating a mixture containing Y₂O₃, Al₂O₃ and Cr₂O₃ at 1500 °C for 6 h. Later, effect of the doped chromium amount on the pigment redness (a^*) has been studied. The highest redness has been obtained when y was 0.04(YAl_1−yCr_yO₃). Application of the prepared red pigment in low and high temperature glazes, demonstrated its high chemical and thermal stability.