Depolymerization of GeO2 and B2O3‐GeO2 Network Glasses by Sb2O3

Journal of the American Ceramic Society - Tập 56 Số 6 - Trang 303-309 - 1973
E. F. Riebling1
1Institute of Polymer Science The University of Akron Akron, Ohio 44325

Tóm tắt

Binary Sb2O3‐GeO2 glasses containing 45 mol% Sb2O3 and ternary Sb2O3‐B2O3‐GeO2 glasses containing 50 mol% GeO2 were prepared. Their densities (volumes), refractive indices, and infrared spectra were determined, and their colors and high‐temperature viscosities were estimated visually. Small amounts of Sb2O3 (∼10 mol%) appear to perturb neither the Ge‐O‐Ge network nor those B‐O‐Ge networks with small B/Ge ratios (∼0.2). The B‐O‐Ge networks with larger B/Ge ratios (∼1.0) depolymerize in the presence of even less Sb2O3. Amounts of Sb2O3 >10 mol% appear to depolymerize the Ge‐O‐Ge and Ge‐O‐B networks progressively, possibly with the formation of chains. A structurally sensitive ir isofrequency contour technique developed for ternary glass systems was applied successfully to these Sb2O3‐B2O3‐GeO2 glasses. These contours can thus readily detect significant network depolymerization in the absence of the usual network modifiers.

Từ khóa


Tài liệu tham khảo

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Thông tin xuất bản

Journal of the American Ceramic Society

Tập 56 Số 6

303-309

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