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The influence of different ions in the formation of AI(OH)3 polymorphs has been studied experimentally by promoting stoichiometric reactions between the aluminum salts (A1C13, Al(NO3)3, A12(504)3) and bases (NaOH, KOH, NH4OH). In all cases the polymorphs obtained were a mixture of gibbsite, bayerite and nordstrandite or pseudoboehmite with the exception of the reaction between KOH, or NH4OH and A12(504) 3 which produced amorphous gels. Ageing of these gels at ambient temperature and pressuredoi:10.1346/ccmn.1995.0430113 fatcat:nmxyxqwdfjhnthv4bi6b4plrxq