Ferrobielastic switching in quartz at high temperatures

doi:10.1080/00150198308014456

淡江大學機構典藏 > 理學院 > 物理學系暨研究所 > 期刊論文 > Item 987654321/72658

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题名:	Ferrobielastic switching in quartz at high temperatures
作者:	蕭秀美;Shiau, S.M.
贡献者:	淡江大學物理學系
日期:	1983-11-01
上传时间:	2011-10-24 10:48:57 (UTC+8)
摘要:	Quartz is ferrobielastic with Dauphine twins differing in the orientation of the elastic compliance and piezoelectric tensor. Therefore a suitably-oriented stress can produce different strain in the two domains, causing a free energy difference between the two domain states and producing a driving force for domain reorientation and twin wall motion. Ferrobielastic twinning has been studied optically utilizing the photoelastic effect from room temperature up to 400°C. The coercive stress for ferrobielastic switching decrease with increasing temperature. The coercive stress needed to cause switchover in synthetic crystals is about 7 × 108 Pa at room temperature. Experiments at 150°C show switchover at 5·2 × 108 Pa and at 200°C about 1·9 × 108 Pa. The coercive stress data decrease monotonically with increasing temperature up to 250°C, above which the domain patterns depart radically from those observed at lower temperatures. The inverse relationship between coercive stress and temperature continued at higher temperature but with a discontinuity at 250°C separating two apparently linear segments. Beyond 400°C even very small stresses are sufficient to induce twinning and it becomes difficult to observe optically, therefore the electrical method is used to study twinning at near the α-β transition. Additional details concerning high temperature twinning will be presented at the meeting.
關聯:	Ferroelectrics 50(1-4), pp.569
DOI:	10.1080/00150198308014456
显示于类别:	[物理學系暨研究所] 期刊論文

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