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Structural insights of hierarchically engineered feldspars by confocal Raman microscopy
Author(s) -
Fuertes de la Llave V.,
Campo A.,
Fernández J.F.,
Enríquez E.
Publication year - 2019
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.5556
Subject(s) - raman spectroscopy , materials science , albite , plagioclase , raman scattering , anorthite , feldspar , lamellar structure , mineralogy , crystallography , analytical chemistry (journal) , chemical physics , chemistry , optics , composite material , quartz , physics , chromatography
A structural and compositional characterization of fast‐sintered Na‐rich feldspar is carried out by means of the confocal Raman microscopy. The analysis of the main Raman modes ( ν a = 512 cm −1 and ν b = 480 cm −1 ) determines that feldspar crystallizations correspond to a sodic‐plagioclase group, with an anorthite proportion estimated of 25–45%. The presence of alkali and alkaline earth in the formulated composition leads to albite type feldspar with slightly Al–Si disordered distribution in tetrahedral sites. Raman shift of the main Raman mode ν a reveals differences in crystal stresses between nanograins and micrograins. The Rayleigh light‐scattering microscopy shows up lamellar domains of ~2–3 μm resulting from unmixing by spinodal decomposition. Combining Raman spectroscopy and X‐ray diffraction versus temperature significant structural changes are confirmed. This structural change correlates with a stress release and thermally activated conduction. This research gives fundamental understanding of structure, chemical composition, and micro‐nanostructure of engineered glass–ceramics, which may allow tailoring them: for example, to modulate spinodal decomposition regions and interphases.