Effect of pores and grain size on the elastic and piezoelectric properties of quartz-based materials
Effect of pores and grain size on the elastic and piezoelectric properties of quartz-based materials
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DOI：
10.2138/am-2015-5180ccby
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发表时间：
2015-05-01
影响因子：
3.1
通讯作者：
Salje, Eichard K. H.
中科院分区：
文献类型：
--
作者：
Aufort, Julie;Aktas, Oktay;Salje, Eichard K. H.
利用共振压电谱(RPS)和共振超声谱(RUS)研究了颗粒尺寸和孔隙率对SiO_2基材料的压电性能和弹性性能的影响。对玛瑙进行的RPS显示了与单晶石英相当的压电性效应。在玛瑙中观察到的强压电性要求在晶体生长过程中SiO_2择优取向。同样，在云母岩和砂岩中，有限(但微弱)的RPS信号很明显，这表明预期的压电石英颗粒的随机化是不完整的。另一方面，孔隙率为40%的石英玻璃Vycor没有显示出压电效应的证据。根据随温度变化的RPS和RUS测量，多晶样品中石英的a-P转变温度没有变化。在加热条件下，石英和玛瑙的弹性常数随温度的变化是可逆的，而砂岩和Vycor则是不可逆的。
The role of grain size and porosity in the piezoelectric and elastic properties of SiO2-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 SiO2 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 a-P 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.