January 9, 2021
Journal Article

Influence of ion site occupancies on the unit cell parameters, specific volumes, and densities of M8(AlSiO4)6X2 sodalites where M=Li, Na, K, Rb, and Ag and X=Cl, Br, and I

Abstract

This paper discusses the effects of chemistry on the unit cell parameter (a), unit cell volume (V), specific volume (v), and density (?) of various sodalite compositions including (M+)8(AlSiO4)6Cl2 (M+ = Li+, Na+, K+, Rb+, and/or Ag+) and Na8(AlSiO4)6(X–)2 (X– = Cl–, Br–, and/or I–). Compositional models were developed, and the results show that, within the compositional range available in the literature, the models are successful at predicting a, V, and v (and thus ?). Discussion is included on the correlation between the ionic radii of the alkalis and halides in the sodalite ß-cages and the measured values of a, V, v, and ?. The data show linear increases in a, V, and ? with increases in the average ionic radii of the M+ and X– constituents (data for v show a linear decrease).

Revised: February 4, 2021 | Published: January 9, 2021

Citation

Riley B.J., J.A. Peterson, S. Chong, and J.D. Vienna. 2021. Influence of ion site occupancies on the unit cell parameters, specific volumes, and densities of M8(AlSiO4)6X2 sodalites where M=Li, Na, K, Rb, and Ag and X=Cl, Br, and I. Physics and Chemistry of Minerals 48, no. 1:Article No. 3. PNNL-SA-153625. doi:10.1007/s00269-020-01124-4