ELASTIC PROPERTIES OF SILICA POLYMORPHS - A REVIEW

被引:0
|
作者
Pabst, Willi [1 ]
Gregorova, Eva [1 ]
机构
[1] Prague ICT Prague, Inst Chem Technol, Dept Glass & Ceram, Prague 16628 6, Czech Republic
关键词
Silica; Elastic properties; Auxetic materials; Quartz; Tridymite; Cristobalite; Coesite; Stishovite; Silica glass; Young's modulus (Tensile modulus); Shear modulus; Bulk modulus (Compressive modulus); (Negative) Poisson ratio; ALPHA-BETA-TRANSITION; ZIRCONIA COMPOSITE CERAMICS; HIGH-PRESSURE ELASTICITY; NEGATIVE POISSON RATIOS; HIGH-TEMPERATURE PHASE; CRYSTAL-STRUCTURE; MOLECULAR-DYNAMICS; THERMAL-STABILITY; SINGLE-CRYSTAL; QUARTZ;
D O I
暂无
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
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 is given that lists the recommended current "state-of-the-art" values. All data are consistent with the well-known auxetic behavior of cristobalite at room temperature, and high-temperature simulation data published for cristobalite confirm aztxetic behavior for all temperatures from room temperature up to more than 1500 degrees C. The calculations of this paper show that also quartz can be auxetic, but only in a very limited temperature range around the low-to-high-quartz transition temperature (420 - 577 degrees C). Experimental measurements of elastic properties of tridymite and cristobalite, including high-temperature measurements, are identified as a desideratum of future research.
引用
收藏
页码:167 / 184
页数:18
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