Effect of pores and grain size on the elastic and piezoelectric properties of quartz-based materials

Aufort, J. and Aktas, O. and Carpenter, M. A. and Salje, E. K. H. (2015) Effect of pores and grain size on the elastic and piezoelectric properties of quartz-based materials. American Mineralogist, 100. pp. 1165-1171. ISSN 0003-004X DOI 10.2138/am-2015-5180CCBY

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Abstract

The role of grain size and porosity in the piezoelectric and elastic properties of SiO<inf>2</inf>-based materials was investigated using resonant piezoelectric spectroscopy (RPS) and resonant ultrasound spectroscopy (RUS). RPS performed on agate revealed a piezoelectric effect comparable in magnitude to that in single-crystal quartz. The observed strong piezoelectricity in agate requires preferential orientation of SiO<inf>2</inf> during crystal growth. Similarly, in novaculite and sandstone finite (but weak) RPS signals were evident, suggesting that the expected randomization of the piezoelectric quartz grains is incomplete. On the other hand, Vycor, a silica glass with a porosity of 40, showed no evidence of the piezoelectric effect. According to temperature-dependent RPS and RUS measurements, the α-β transition temperature in quartz does not change in polycrystalline samples. Finally, the temperature dependence under heating of the elastic constants is reversible in quartz and agate and irreversible in sandstone and Vycor.

Item Type:	Article
Uncontrolled Keywords:	2015AREP; IA69;
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences 07 - Gold Open Access
Journal or Publication Title:	American Mineralogist
Volume:	100
Page Range:	pp. 1165-1171
Identification Number:	10.2138/am-2015-5180CCBY
Depositing User:	Sarah Humbert
Date Deposited:	17 Aug 2015 12:09
Last Modified:	25 Aug 2015 14:21
URI:	http://eprints.esc.cam.ac.uk/id/eprint/3404

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