A simple predictive model for the thermal expansion of AlSi3 feldspars

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A simple predictive model for the thermal expansion of AlSi3 feldspars

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Title: A simple predictive model for the thermal expansion of AlSi3 feldspars
Author: Hovis, Guy L.; Roux, J.; Harlov, D.; Henderson, C. M. B.; Mott, A.; Person, E. L.; Morabito, J. R.; Spooner, A.
Abstract: We have investigated the thermal expansion of several synthetic feldspars, including Li-feldspar, rubicline (Rb-microcline), Rb-sanidine, and buddingtonite (NH4-feldspar). When analyzed in conjunction with earlier data on both ordered and disordered Na- and K-feldspars, it is clear that the coefficient of thermal expansion (α) decreases dramatically, and linearly, with increasing room-temperature volume. For “AlSi3” feldspars, then, chemical expansion limits thermal expansion. The relationship between α and room-temperature volume provides a useful predictive tool based simply on the volume of a feldspar at room temperature. This relationship also reveals that volumes of K-Na mixing in naturally occurring alkali feldspars decrease with increasing temperature.
URI: http://hdl.handle.net/10385/544
Date: 2008

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