有機媒体中での反応による層状構造をもったリン酸アルミニウムの合成とその特性(<特集>セラミック材料)

概要

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We have synthesized the pure single phase of aluminium tri-hydrogen bis(orthophoshate)monohydrate[AlH_3(PO_4)_2・H_2O]by using hydrophilic organic solvent, with high efficiency. It is a material with layered structure. The optimum condition to prepare it was as follows;the mixtures of 75wt% H_3PO_4 and Al(OH)_3(0.1mol)(molal ratio of H_3PO_4 to Al(OH)_3=4.0)was refluxed at 94℃ for 6 hours under stirring in 1-propanol(200cm^3).Shape of products obtained was needle, and its length increased from 5μm to 80μm with increasing the reaction times. The maximal acid strength and amount of acid of solid surface pKa=+1.5 and 1.81〜2.13(x10^<-2> mmolg^<-1>), respectively. AlH_3(PO_4)_2・H_2O changed to AlPO_4(berlinite, cristobalite-form)and Al(H_2PO_4)_3(B-form, C-form)by dehydration of monohydrate at 160℃.
社団法人日本材料学会の論文
2000-06-15