Phase relations in the pseudobinary system TiO2Ga2O3 |
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Authors: | S Kamiya RJD Tilley |
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Institution: | School of Materials Science, University of Bradford, Bradford BD7 1DP, Yorkshire, United Kingdom |
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Abstract: | Phase relations and microstructures in the TiO2-rich part of the TiO2Ga2O3 pseudobinary system have been determined at temperatures between 1373 and 1623°K using X-ray diffraction and electron and optical microscopy. The phases occurring in the system are TiO2 (rutile), β-Ga2O3, a series of oxides Ga4Tim?4O2m?2 (m odd) which exist above 1463°K, and Ga2TiO5, which exists above 1598°K. The width of the phase region occupied by the Ga4Tim?4O2m?2 phases varies with temperature. At 1473°K it is narrow, and has limits of Ga4Ti25O56 to Ga4Ti21O48 while at higher temperatures it broadens to limits of from Ga4Ti27O60 to Ga4Ti11O28 at 1623°K. These phases are often disordered and crystals frequently contain partially ordered intergrowths of oxides with various values of m. On the TiO2-rich side of the phase region there is a continuous change in texture from rutile to the end members of the Ga4Tim?4O2m?2 structures. The findings are summarized on a phase diagram. |
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