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- W1964823428 abstract "We have investigated extensions and modifications of previous AlPO4 growth techniques, designed to overcome the difficulties posed by the negative temperature coefficient of solubility. On the assumption that solubility could be improved even at higher temperatures provided pressure was kept high, we investigated crystal growth in the range 150–325°C at 1000–10,000 psi. The preparation of nutrient material of large enough particle size that it would not be convected in the hydrothermal fluid and become included in the crystal posed a problem. Successful techniques for the recrystallization of small particle AlPO4 by slowly raising the temperature of a hydrothermal vessel are described. Processes for growth by slowly increasing the temperature of a saturated solution and for growth in a negative temperature gradient where the large particle nutrient is contained in a basket in the upper cooler region of the autoclave are described. The fact that growth in a positive temperature gradient is possible has been established and growth on seeds where nutrient was contained in the hotter bottom region of the autoclave and seeds were held in the upper cooler region was carried out. The processes have been used to prepare crystals grown on seeds at rates up to 0.41 mm/day (16 mil/day)." @default.
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- W1964823428 date "1978-04-01" @default.
- W1964823428 modified "2023-09-25" @default.
- W1964823428 title "Hydrothermal synthesis of aluminum orthophosphate" @default.
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- W1964823428 doi "https://doi.org/10.1016/0022-0248(78)90388-3" @default.
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