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The short-range structure of TeO 2 glass was studied by a combined solid-state NMR, Raman, and first-principles calculation approach. Glass samples enriched in oxygen-17 were prepared, and both 125 Te and 17 O spectra were recorded. In addition, spectra of α-TeO 2 and γ-TeO 2 crystal phases were recorded to aid in spectral assignment. The identity of the crystal phases was confirmed by X-ray diffraction and Raman spectroscopy. First-principles computations on the TeO 2 crystal phases as well as on several potassium tellurites were carried out for comparison. It was found that the structure of TeO 2 glass is best described as a highly disordered form of the γ-TeO 2 crystal.
Lithium disilicate glass-ceramics were discovered in the 1950s, and the evolution of the main target phase of these materials is well known. However, the lithium disilicate system is still an area of active research, especially when a secondary phase is introduced since the phase evolution of secondary phases is not currently understood. The present study examines the main target phases, as well as a secondary phase of lithium tantalate, via X-ray diffraction. A large data set is obtained to investigate the evolution of all phases. It is found that the nucleation of the precursor lithium metasilicate phase is coupled to both the nucleation of the primary target phase, lithium disilicate, and the nucleation of lithium tantalate. A reaction equation describing this relationship is proposed.
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