ilica incorporation into sodium aluminum phosphate glasses: Structural characterization by Raman spectroscopy and multinuclear solid-state NM

Author(s)

Logrado, Millena ^[1] ; Eckert, Hellmut ^{[1, 2]} ; Ikeda, Hikaru ^[3] ; Nakane, Shingo ^[3] ; Yamazaki, Hiroki ^[3]

Affiliation

^[1] Univ Sao Paulo, Inst Fis Sao Carlos, CP 369, BR-13566590 Sao Carlos, SP - Brazil

^[2] Westfalische Wilhelms Univ Munster, Inst Phys Chem, Corrensstr 30, D-48149 Munster - Germany

^[3] Nippon Elect Glass Co Ltd, 7-1 Seiran 2 Chome, Otsu, Shiga 5208639 - Japan

• Document type: Journal article
• Source: Journal of Non-Crystalline Solids; v. 579, MAR 1 2022.
• Web of Science Citations: 0

Abstract

Optical fiber glasses in the system (59-xP(2)O(5))-xSiO(2)-13Al(2)O(3)-28Na(2)O show non-linear trends in the glasstransition temperatures, thermal expansion coefficients, and weathering stabilities. The structural origins have been studied using solid-state NMR and Raman spectmscopies on a series of bulk glasses with 0 <= x <= 13. Two types of P-2 units - those dominantly interacting with Na+ and those interacting more strongly with Al can be differentiated by P-31[Na-23] and P-31[Al-27] double resonance experiments. Silicon is four-coordinated, fully polymerized, and engaged in Si-O-P linkages. Trends in the Si-29 chemical shifts and the P-31-P-31 dipolar interaction strengths are related to the Si-O-P, Si-O-Al, and P-O-P connectivity distributions, providing a rationale for changes in macroscopic properties. (AU)

• FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
• Grantee: Edgar Dutra Zanotto
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC