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Synthesizing densified glasses with structure ordering is an important issue for the development of new optical fibers with high refractive index and low dispersion. Herein, we report on our attempt to synthesize densified silica (SiO2) glasses by hot compression at a pressure of 7.7 GPa and temperatures above 1200 °C. We succeeded for the first time in recovering densified SiO2 glasses compressed at 7.7 GPa and 1300 °C. Samples compressed above 1300 °C were crystallized into coesite by heterogeneous nucleation. The height of the first sharp diffraction peak in high-energy X-ray and neutron diffraction data of densified SiO2 glasses increased with increasing temperature, indicating the evolution of intermediate-range ordering. Furthermore, the density increase of hot-compressed SiO2 glasses was estimated by analyzing reduced pair distribution functions. We found that the SiO2 glass compressed at 7.7 GPa and 1300 °C is by far the most densified and structurally ordered (hyperorderd) glass in the world.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Densified glass, Hot compression, Structure, X-ray diffraction, Neutron diffraction

Date published: 2024-07-01

Publisher: The Ceramic Society of Japan

Journal:

• Journal of the Ceramic Society of Japan (ISSN: 13486535) vol. 132 issue. 7 p. 427-433 24013

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.2109/jcersj2.24013

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Updated at: 2024-08-26 16:30:29 +0900

Published on MDR: 2024-08-26 16:30:29 +0900