Experimental Investigation of Cation Exchange Equilibria of the Gallium Feldspar Solid Solution (K, Rb)GaSi₃O₈ with KCl–RbCl–H₂O Fluids at 550°C and 1.5 kbar with Applications to the Description of the Properties of Solid Solutions with the Feldspar Structure

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2025年10月2日

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A. R. Kotelnikov,
N. I. Suk,
Z. A. Kotelnikova,
G. M. Akhmedzhanova,
N. A. Drozhzhina

摘要

Abstract

Feldspars of the KGaSi₃O₈–RbGaSi₃O₈ series were synthesized at 550°C and 1.5 kbar, and their exchange reactions with 1 M KCl + 1 M RbCl solution were investigated. Using the experimental data, Margules parameters were calculated for the description of the excess mixing energies of the (K,Rb)GaSi₃O₈ solid solution: W^G1 = W^G2 = 4.46 ± 0.11 kJ/mol. We refined the unit-cell parameters of the solid solutions; the excess mixing volume is described by the Margules model: W^V1 = 2.647 ± 0.05 and W^V2 = –0.883 ± 0.04 cm³/mol. The results were compared with feldspars studied previously. Empirical relations were proposed for the calculation of the energy Margules model and unit-cell volumes for various minerals with the feldspar structure.

Experimental Investigation of Cation Exchange Equilibria of the Gallium Feldspar Solid Solution (K, Rb)GaSi3O8 with KCl–RbCl–H2O Fluids at 550°C and 1.5 kbar with Applications to the Description of the Properties of Solid Solutions with the Feldspar Structure

摘要

Experimental Investigation of Cation Exchange Equilibria of the Gallium Feldspar Solid Solution (K, Rb)GaSi₃O₈ with KCl–RbCl–H₂O Fluids at 550°C and 1.5 kbar with Applications to the Description of the Properties of Solid Solutions with the Feldspar Structure