# Effect of cristobalite on the response to indentation in potassium-fluorrichterite glass-ceramics

https://mdr.nims.go.jp/datasets/b1587c8b-49b6-40f9-ba10-dacfe3244833

## File

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## Id

b1587c8b-49b6-40f9-ba10-dacfe3244833

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-11-07T04:50:01.767489Z

## Updated at

2025-11-10T07:30:29.237085Z

## Published at

2025-11-10T07:25:07.606754Z

## Doi

https://doi.org/10.48505/nims.5881

## First published url

https://doi.org/10.2109/jcersj2.25077

## Date published

2025-11-01

## Recorded date published

2025

## Resource type

journal_article

## Manuscript type

authors_original

## Collection



## Title

- title: Effect of cristobalite on the response to indentation in potassium-fluorrichterite
    glass-ceramics
  title_type: original
  lang: en

## Description

- description: Glass-ceramics containing potassium-fluorrichterite (KNaCaMg5Si8O22F2)
    as the primary crystalline phase are known for their high bending strength and
    fracture toughness. It is also recognized that cristobalite precipitates in the
    commercial product as a secondary phase. This study investigated the response
    to indentation to identify the effect of cristobalite in potassium-fluorrichterite
    glass-ceramics with a chemical composition similar to that of the commercial product.
    The results revealed that the addition of 0.79 wt% Li2O promoted the precipitation
    of cristobalite during heat treatment at temperatures up to 1000 °C. A distinct
    volume change associated with the α–β phase transition of cristobalite was observed
    at approximately 200 °C. Vickers indentation tests indicated that hardness decreased
    with the growth of potassium-fluorrichterite crystals and further declined with
    the precipitation of cristobalite. The glass-ceramics containing both potassium-fluorrichterite
    and cristobalite exhibited permanent, hemispherical surface deformation in ball
    indentation tests. Synchrotron radiation X-ray computed tomography revealed the
    formation of microcracks in the cristobalite-containing glass-ceramics. It was
    suggested that the microcracks generated by stresses arising from the cristobalite
    phase transition led to the deformation and consequently contributed to the ductile
    behavior of the material. The findings of this study are expected to provide valuable
    insights into the microstructural design of cristobalite-containing glass-ceramics
    with enhanced mechanical performance.
  description_type: abstract
  lang: eng

## Creator

- name: Keitaro HIRAOKA
  role: author
  organization: Tokyo University of Science
- name: Gaku Okuma
  role: author
  orcid: https://orcid.org/0000-0002-2997-9166
  organization: National Institute for Materials Science
  department: Research Center for Structural Materials/Materials Manufacturing Field/Ceramic
    Matrix Composites Group
- name: Akihisa TAKEUCHI
  role: author
  organization: Japan Synchrotron Radiation Research Institute (JASRI)
- name: Masayuki UESUGI
  role: author
  organization: Japan Synchrotron Radiation Research Institute (JASRI)
- name: Yuki SADA
  role: author
  organization: Japan Synchrotron Radiation Research Institute (JASRI)
- name: Ken-ichi KATSUMATA
  role: author
  organization: Tokyo University of Science
- name: Atsuo YASUMORI
  role: author
  organization: Tokyo University of Science
- name: Kei MAEDA
  role: author
  organization: Tokyo University of Science

## Contact agent



## Publisher

organization: Ceramic Society of Japan

## Managing organization



## Keyword

- subject: Glass-ceramics
  schema: not_defined
- subject: Cristobalite, Fluorrichterite
  schema: not_defined
- subject: Indentation, Microcrack
  schema: not_defined

## Rights

- identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Journal of the Ceramic Society of Japan
  issn: '18820743'
  volume: '133'
  issue: '11'
  start_page: 703
  end_page: 708

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## Instrument



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## Specimen



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## Fileset

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  filename: main_document_revise2.docx
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