Abstract
The optical property of LAS glass and the structural states of V 4+ ions were studied by use of kinds of spectra (UV–visible, IR, Raman and EPR) in LAS glass and glass–ceramics containing V 2O 5. It was found that the V 4+ ions formed by reduction of V 5+ ions, and existed as the VO 2+ complex in octahedral coordination with a tetragonal compression with C 4v symmetry in LAS glass. Additionally, the V 4+ ions partially replaced Li + and occupied tetrahedral sites in beta-quartz solid solution crystal phase. The color of the glasses drastically changed from light yellow-green to claret during crystallization, and the optical absorption in visible range attribute to the transitions of 2B 2g → 2B 1g and 2B 2g → 2E g of V 4+ ions in high crystal field, which was affected by the above structural variation of V 4+. Moreover, the addition of V 2O 5 in LAS glass decreased crystallization temperature of main beta-quartz solid solution crystal phase.
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