Influence of alumina addition on crystallization and texturing behavior of LaBGeO5 glassстатья Исследовательская статья

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[1] Influence of alumina addition on crystallization and texturing behavior of labgeo5 glass / V. N. Sigaev, P. Pernice, A. Aronne et al. // Journal of Non-Crystalline Solids. — 2006. — Vol. 352, no. 21-22. — P. 2123–2128. The structure and crystallization behavior of glasses with 25La2O3 · 25B2O3 · 50GeO2 composition, melted in platinum (P glass) and corundum (A glass) crucibles, were studied by DTA, X-ray diffraction and FTIR spectroscopy. The Al2O3 dissolved from corundum crucible in the A glass was estimated to be in the range 5-7 wt%. This alumina content had almost no influence on glass transition temperature but strongly affected the structure and crystallization behavior of the A glass. In fact, the P glass showed good texture-forming ability: high quality textured glass-ceramic plates based on stillwellite-like LaBGeO5 crystals were easily obtained. On the contrary, the presence of alumina stabilized the A glass from which binary phases crystallize first, and only afterwards they are transformed in stillwellite by secondary crystallization: so in this glass texturing is hindered. Crystallization and texturing behavior of P and A glasses were well related to FTIR data. P glass contained both threefold and fourfold coordinated boron while in the A glass the presence of aluminum forced boron to assume almost exclusively threefold co-ordination. Hence the easier crystallization of stillwellite phase and the good textures obtained from the P glass contrary to the A glass, can be well understood since all boron atoms have tetrahedral co-ordination in stillwellite LaBGeO5 crystal. © 2006 Elsevier B.V. All rights reserved. [ DOI ]

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