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Precipitous weakening of quartz at the α–β phase inversion

Lookup NU author(s): Emeritus Professor Trevor Page


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© 2020 American Ceramic Society (ACERS)Crystalline quartz has long been identified as among the weakest of abundant crustal minerals. This weakness is particularly evident around the α–β phase inversion at 573°C, in which Si–O bonds undergo a displacive structural transformation from trigonal to hexagonal symmetry. Here we present data using indentation testing methodologies that highlight the precipitous extent of the transformational weakening. Although the indentations are localized over relatively small specimen contact areas, the data quantify the essential deformation and fracture properties of quartz in a predominantly (but not exclusively) compressive stress field, at temperatures and pressures pertinent to conditions in the earth's crust.

Publication metadata

Author(s): Lawn B, Marshall D, Raj R, Hirth G, Page T, Yeomans J

Publication type: Article

Publication status: Published

Journal: Journal of the American Ceramic Society

Year: 2021

Volume: 104

Issue: 1

Pages: 23-26

Print publication date: 01/01/2021

Online publication date: 08/09/2020

Acceptance date: 28/08/2020

ISSN (print): 0002-7820

ISSN (electronic): 1551-2916

Publisher: Blackwell Publishing Inc.


DOI: 10.1111/jace.17470


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