抄録
Crystalline aluminium orthophosphate AlPO4 has various polymorphic forms. However, it is difficult to prepare a pure single phase AlPO4. In order to synthesize a single phase of AlPO4, we have undertaken the dehydration of aluminium orthophosphate dihydrate AlPO4·2H2O (metavariscite) in organic solvent. The crystalline phases of obtained products were identified by X-ray diffraction method and measurement of MAS-NMR 31P and 27Al. A crystalline AlPO4 (berlinite, tridymite-form, cristobalite-form, or A-form) was selectively synthesized by controlling the amount of H3PO4 and sort of organic solvent (1-butanol and isobutyl methyl ketone).
