| 摘要 |
A novel crystalline aluminum ammonium phosphate, characterized by predominantly equiaxed crystals, is provided of the formula: Al2(NH4)OH(PO4)2.2H2O. The phosphate is useful as a dentifrice polishing agent and filler for plastics. The novel product can be prepared by reacting aluminum trihydroxide with diammonium orthophosphate or monobasic ammonium phosphate. By heating at elevated temperature, the product can be converted to the tridymite form of aluminum phosphate.
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