Garnet forming solid state reactions in FeYCaZrO systems with different Y-Fe ratios

Abstract

Solid state reactions in the Fe2O3-Y2O3-CaCO3-ZrO2 mixtures with different Y-Fe ratios (0 < Fe2O3 < 4.75; 3.25 Y2O3; 1.0 CaCO3; 1.0 ZrO2 molar ratio) sintered at 700-1400°C were investigated by x-ray diffraction and DTG(M) methods. The DTG(M) method proved to be very effective in detecting very small amounts of magnetic constituents in the sample. The most interesting features of the reactions are the following:– At iron contents higher than 2.75 molar ratio in the temperature region 1200-1400°C Ca and Zr containing garnets are formed.– In mixtures with a Fe2O3 content less than 2.75 molar ratio the formation of orthoferrite is preferred.– A new Y2O3-type phase (Y2O'3) is the dominant component in systems with a low iron content.