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ELASTIC PROPERTIES OF SILICA POLYMORPHS - A REVIEW

Ceramics (Praha), 2013-01, Vol.57 (3), p.167-184 [Peer Reviewed Journal]

ISSN: 0862-5468 ;EISSN: 1804-5847

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  • Title:
    ELASTIC PROPERTIES OF SILICA POLYMORPHS - A REVIEW
  • Author: Pabst, W ; Gregorova, E
  • Subjects: (Negative) Poisson ratio ; Auxetic materials ; Bulk modulus (Compressive modulus) ; Coesite ; Cristobalite ; Crystal structure ; Elastic constants ; Elastic properties ; Mathematical analysis ; Quartz ; Shear ; Shear modulus ; Silica ; Silica glass ; Silicon dioxide ; Simulation ; Stishovite ; Tridymite ; Young’s modulus (Tensile modulus)
  • Is Part Of: Ceramics (Praha), 2013-01, Vol.57 (3), p.167-184
  • Description: The elastic properties of silica phases are reviewed. Available monocrystal data for crystalline SiO2 polymorphs (low-quartz, high-quartz, low-cristobalite, high-cristobalite, stishovite) are collected from the literature, and effective elastic constants (Young's moduli, shear moduli, bulk moduli and Poisson ratios) are calculated from these using Voigt-Reuss-Hill averaging. Both experimental data and simulation results are taken into account. A table of room temperature elastic constants for crystalline silica polymorphs and silica glass that lists the recommended current "state-of-the-art" values is given. All data are consistent with the well-known auxetic behaviour of cristobalite at room temperature, and high-temperature simulation data published for cristobalite confirm auxetic behaviour for all temperatures from RT up to more than 1500 C. The calculations also show that quartz can be auxetic, but only in a very limited temperature range around the low-to-high-quartz transition temperature (420-577 C). Experimental measurements of elastic properties of tridymite and cristobalite, including high-temperature measurements, are identified as a desideratum of future research.
  • Publisher: University of Chemistry and Technology, Prague
  • Language: English
  • Identifier: ISSN: 0862-5468
    EISSN: 1804-5847
  • Source: Alma/SFX Local Collection
    DOAJ Directory of Open Access Journals
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