# Hyperordered structures in silica polymorphs

https://mdr.nims.go.jp/datasets/fd6f2e58-dc7d-4d87-be32-6b878af277cb

## File

- [133_25038.pdf](https://mdr.nims.go.jp/filesets/114a8501-a070-46d0-8b49-2e18f8b1376d/download) ([Detail](https://mdr.nims.go.jp/filesets/114a8501-a070-46d0-8b49-2e18f8b1376d.md))

## Id

fd6f2e58-dc7d-4d87-be32-6b878af277cb

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-09-02T05:32:55.243993Z

## Updated at

2025-09-02T23:30:21.281749Z

## Published at

2025-09-02T23:19:12.466585Z

## Doi



## First published url

https://doi.org/10.2109/jcersj2.25038

## Date published

2025-09-01

## Recorded date published

2025

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Hyperordered structures in silica polymorphs
  title_type: original
  lang: en

## Description

- description: 'We have been exploring with the quest hyperordered structures in terms
    of “order within disorder” in silica (SiO2) polymorphs. In this article, we review
    and discuss our recent findings on this topic comprehensively in comparison with
    those of previous studies. We chose several SiO4 tetrahedral corner-sharing crystalline
    silica and siliceous zeolites of various density. Furthermore, we attempted to
    control the intermediate-range ordering of glass by tuning of the density of silica
    glass under high pressures and temperatures. We extracted the density-driven modification
    of the topology of tetrahedral silica polymorphs in a wide density range. Our
    state-of-the-art analyses revealed two descriptors for hyperordered structures
    in silica polymorphs. The first descriptor of hyperordered structures in silica
    glass can be expressed by the position and height of diffraction peaks observed
    in X-ray and neutron diffraction data. This descriptor is not new, but we can
    systematically understand the density-driven behaviour of diffraction peaks in
    silica glass. The second descriptor of hyperordered structures in a series of
    silica polymorphs can be expressed in terms of topological characteristics: ring
    size distribution, cavity distribution, ring shape, and tetrahedral order. We
    found an unusually large cavity volume in β-cristobalite which was attributable
    to the formation of highly symmetrical –Si–O– sixfold rings, and highly symmetrical
    eightfold and twelvefold rings in coesite even though most of the small rings
    were significantly buckled, which was due to coesite having the highest density
    of coesite among the series of silica polymorphs. Moreover, we found a topological
    similarity between glass and siliceous zeolite (MFI), in which fivefold and sevenfold
    rings are observed. It is concluded that both diffraction measurement and topological
    analysis provide us crucial information on hyperordered structures in silica polymorphs.'
  description_type: abstract
  lang: und

## Creator

- name: Shinji Kohara
  role: author
  orcid: https://orcid.org/0000-0001-9596-2680

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## Publisher

organization: Ceramic Society of Japan

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## Keyword

- subject: ガラス
  schema: not_defined
- subject: 構造
  schema: not_defined
- subject: トポロジー
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Journal of the Ceramic Society of Japan
  issn: '13486535'
  volume: '133'
  issue: '9'
  article_number: '25038'

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## Fileset

- id: 114a8501-a070-46d0-8b49-2e18f8b1376d
  filename: 133_25038.pdf
  content_type: application/pdf
  size: 5098200
  md5: 0e7f54d805d8e4febc9b53bb181e590f

## Thumbnail

fileset_id: 114a8501-a070-46d0-8b49-2e18f8b1376d
filename: 133_25038.pdf