The structures of the salt-bearing aluminosilicates, Species P and Q

Abstract

Determinations have been made of the structures of the salt-bearing aluminosilicates, Species P and Q, having unit-cell compositions Ba15[Al30Si66O192]1.7 Ba (OH)2, 12.5 BaCl2, 35H2O and Ba15[Al30Si66O192]1.6 Ba(OH)2, 11.9 BaBr2, 30H2O respectively. The structure of the zeolite (Na,Ba0,5)30[Al30Si66O192]1.7(Na2,Ba)Cl2, 72H2O obtained from Species P by extraction of BaCl2 with NaNO3 · aq has also been determined. The structures confirmed that the alumosilicate frameworks of all three phases were based upon that of zeolite ZK-5. Much of the non-framework scattering material was also located in the three structures. Within characteristic 18-hedral cavities the non-framework ions and molecules were almost identically arranged in Species P and Q and had a very similar configuration in the extracted Species P, so that this configuration appears to be determined largely by the form of the 18-hedron. The arrangement within 26-hedra also showed similarities between the three structures but here the greater volume permitted greater variations in configuration.