Abstract
Structural changes of the feldspar framework result in significant changes of the phonon frequencies. Optically active lattice vibrations show systematic changes of their absorption or scattering profiles due to displacive structural shear (e.g. during displacive phase transitions), Al,Si ordering and exsolution phenomena. Systematic studies of alkali feldspars and anorthite lead to an empirical calibration of these structural and microstructural parameters using hard-mode spectroscopy. An important advantage of this technique is its short characteristic length scale. In contrast to diffraction experiments, structural changes on a scale of some 10 Å are detected without interference from the coherent lattice. This allows the analysis of heterogeneous and modulated structures. A typical example is orthoclase with strain modulation on a 100 Å scale. This material has no equivalent modulation of its Al,Si degree of order. Kinetically Al,Si (dis-)ordered Na-feldspar and anorthite are used as further examples for the discussion of the experimental technique and the theoretical analysis of spectrocopic data.
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Salje, E.K.H. (1994). Phase Transitions and Vibrational Spectroscopy in Feldspars. In: Parsons, I. (eds) Feldspars and their Reactions. NATO ASI Series, vol 421. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1106-5_3
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