Exsolution of β-Ga2O3 Crystalline Solutions in the System MgAl2O3-Ga2O3 |
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| Authors: | GERALD KATZ RUSTUM ROY |
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| Affiliation: | Matcrials Resrarch Laboratory, The Pennsylvania State University, University Park, Pennsylvania |
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| Abstract: | The subsolidus phase equilibrium diagram for the pseudobinary join MgAl2O4-Ga2O3 was determined. The shape of the exsolution boundary was obtained by heat-treating samples pre- equilibrated at 1600°C. Crystalline solubility of Ga2O3 in MgAl2O4 decreased from 73 mole % at 1600°C to 55 mole % at 1200°C. The crystalline solution was formed by the replacement of Mg2+ions by Ga3+ ions to produce a cation defect spinel. The phase precipitated was the mono-clinic δ-Ga2O3 (=δ-Al2O3 structure). Changes in the ratios of relative X-ray diffraction intensities indicated that the crystalline solutions also disorder with temperature. |
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