Abstract
A change of temperature and composition of a triclinic alkali feldspar is accompanied by displacive and diffusive movements of atoms. Displacive atomic shifts that occur on quenching increase the lattice angles α, γ and [201]∧b (≈ 180° — γ*) via a shear mechanism. Ordering of Al,Si causes changes in length of A-O and T-O bond distances, which,like the displacive shifts, increase α but decrease y and [201]∧b. From the response of the unit cell dimensions to structural changes it is possible to understand the variation in shape and orientation of the strain ellipsoid upon heating and Na,K-substitution. The strain ellipsoid is investigated for several alkali feldspar series of different structural states to cover the range of structural and metrical changes, in particular those leading to a phase transition.
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Kroll, H. (1984). Thermal Expansion of Alkali Feldspars. In: Brown, W.L. (eds) Feldspars and Feldspathoids. NATO ASI Series, vol 137. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-6929-3_5
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