Abstract
This research was carried out as a part of the study on the synthesis and the stability region of cobalt garnet (Co3Al2(SiO4)3). Mixtures of SiO2, Al2O3, Y2O3 and CoO corresponding to the compositions m[Co3Al2 (SiO4)3](1-m)[Y3Al2(AlO4)3](m: mole ratio) were treated at 1200° and 1400°C for 48 and 18 hr, respectively, at the ambient pressure. The heat-treated samples were examined by a X-ray diffractometer and under a polarizing microscope.Only garnet appeared in the mixtures of m=0.0-0.32, indicating that the crystalline solution phase of Co3Al2(SiO4)3-Y3Al2(AlO4)3 series was stable in this range of m. In the mixtures of m=0.40-0.475 treated at 1200°C granet coexisted with spinel, Y2O3-SiO2 minerals and very minute amount of silica (?), and garnet coexisted with spinel and minute amount of Y2O3-SiO2 minerals in the mixtures treated at 1400°C. No garnet was found in the heat-treated products of the mixtures of m=0.55-0.675. Spinel, cristobalite, Y2O3-SiO2 minerals and minute amounts of unidentified minerals were found in the mixtures treated at 1200°C and only spinels seemed to be stable at 1400°C. Spinel, olivine and cristobalite were found in the mixtures of m=0.75-1.0 treated at 1200°C. At 1400°C spinel was the only crystalline phase.
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