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Hydrothermal Synthesis of Ti:Al_2O_3 Crystal

Dou Jun-hong

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Abstract

The pure α-Al_2O_3 crystal was synthesized by hydrothermal method at 430℃ and 40 MPa. The Ti doped α-Al_2 O_3 was synthesized by doping Ti(OH)_4 in the precursors at the same condition. The shape of Ti doped α-Al_2O_3 crystals is complex, only a few are hexagonal prism. The surface of crystal is smooth, without coarse growing stripe as pure α-Al_2O_3 crystals. The titanium content of crystal was obtained by electron-probe microanalysis (EPMA). The measure results show that the TiO_2 concentration in various crystals synthesized at the same condition is different. The maximal TiO_2 concentration in α-Al_2O_3 crystals is 0.27 wt%.

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What this paper is about

The pure α-Al_2O_3 crystal was synthesized by hydrothermal method at 430℃ and 40 MPa. The Ti doped α-Al_2 O_3 was synthesized by doping Ti(OH)_4 in the precursors at the same condition. The shape of Ti doped α-Al_2O_3 crystals is complex, only a few are hexagonal prism. The surface of crystal is smooth, without coarse growing stripe as pure α-Al_2O_3 crystals. The titanium content of crystal was obtained by electron-probe microanalysis (EPMA). The measure results show that the TiO_2 concentration in various crystals synthesized at the same condition is different. The maximal TiO_2 concentration in α-Al_2O_3 crystals is 0.27 wt%.

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Available abstract

The pure α-Al_2O_3 crystal was synthesized by hydrothermal method at 430℃ and 40 MPa. The Ti doped α-Al_2 O_3 was synthesized by doping Ti(OH)_4 in the precursors at the same condition. The shape of Ti doped α-Al_2O_3 crystals is complex, only a few are hexagonal prism. The surface of crystal is smooth, without coarse growing stripe as pure α-Al_2O_3 crystals. The titanium content of crystal was obtained by electron-probe microanalysis (EPMA). The measure results show that the TiO_2 concentration in various crystals synthesized at the same condition is different. The maximal TiO_2 concentration in α-Al_2O_3 crystals is 0.27 wt%.

Key concepts: Hexagonal prism, Electron microprobe, Materials science, Hydrothermal circulation, Crystal (programming language), Doping, Titanium, Crystallography

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