Abstract
ABSTRACT The optical property and the structural states of vanadium ions were studied by multiple spectra (UV-visible, IR, Raman, and electron paramagnetic resonance (EPR)) in LAS glass and glass-ceramics. The color of glasses changed drastically from light yellow-green to claret during crystallization, the optical absorption in visible range is the characteristic absorption of V4+, and the variation of absorption region is mainly attributed to the change of vanadium ions' coordination polyhedron during crystallization process. The V4+ ions, formed by reduction of V5+ ions, existed as the VO2+ complex in octahedral coordination with a tetragonal compression with C4v symmetry. Additionally, the V4+ ions partially replaced Li+ and occupied tetrahedral sites in beta-quartz solid solution.
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