ELASTIC PROPERTIES OF SILICA POLYMORPHS - A REVIEW

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 modu...

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Bibliographic Details
Published in:Ceramics (Praha) 2013-01, Vol.57 (3), p.167-184
Main Authors: Pabst, W, Gregorova, E
Format: Article
Language:English
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)
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Summary: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.
ISSN:0862-5468
1804-5847