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Coexistence of two states in optically homogeneous silica glass during the transformation in short-range order
- Source :
- Physical Review B. 98
- Publication Year :
- 2018
- Publisher :
- American Physical Society (APS), 2018.
-
Abstract
- Silica glass is an optically homogeneous material with many practical applications. Unlike crystalline materials, it remains optically homogeneous during transformations. However, high-pressure in situ small-angle x-ray-scattering measurements indicate an increase in the scattering intensity during the transformation in short-range order between fourfold-coordinated and sixfold-coordinated amorphous polymorphs, providing strong evidence for heterogeneity. Detailed analyses suggest that silica glass consists of optically invisible subnanometer-scale domains for the two amorphous polymorphs and boundary region between them. The boundary region, which likely has an intermediate structure, is comparable in size to the domains, and works as a buffer to prevent the glass from cracking during the transformation. The transformation is more drastic and the domains are more distinct upon decompression than compression.
- Subjects :
- Materials science
Silica glass
Scattering
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Amorphous solid
Cracking
Transformation (function)
Homogeneous
Chemical physics
0103 physical sciences
Short range order
010306 general physics
0210 nano-technology
Intensity (heat transfer)
Subjects
Details
- ISSN :
- 24699969 and 24699950
- Volume :
- 98
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi...........21cf21a84acde0db38bea229c6ce16fb