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Title: Anneal-induced enhancement of refractive index and hardness of silicophosphate glasses containing six-fold coordinated silicon

A considerable number of optical devices have significantly benefited from the development of phosphate glasses as substrate materials. Introducing silica into sodium phosphate is an effective method to enhance its mechanical and optical properties. Through annealing treatment, the tetrahedral silicon oxide network structure (Si{sup (4)}) can be transformed into an octahedral structure (Si{sup (6)}) with more constraints. Here, we use high-temperature Raman and Nuclear Magnetic Resonance to reveal the mechanism of transformation between the Si{sup (4)} and Si{sup (6)} silicon oxide structures. The increase of the Si{sup (6)} content results in the phosphate glasses having higher refractive index and hardness. Based on this, the refractive index contribution of SiO{sub 6} is obtained.
Authors:
; ; ; ; ; ;  [1]
  1. Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237 (China)
Publication Date:
OSTI Identifier:
22399094
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTRA; ANNEALING; HARDNESS; LIMITING VALUES; NMR SPECTRA; NUCLEAR MAGNETIC RESONANCE; PHASE TRANSFORMATIONS; PHOSPHATE GLASS; RAMAN SPECTROSCOPY; REFRACTIVE INDEX; SILICON; SILICON OXIDES; SODIUM PHOSPHATES