Stress, temperature and electric field effects in the lead-free (Ba,Ca)(Ti,Zr)O3 piezoelectric system
Stress, temperature and electric field effects in the lead-free (Ba,Ca)(Ti,Zr)O3 piezoelectric system
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DOI：
10.1016/j.actamat.2014.06.005
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发表时间：
2014-10-01
期刊：
影响因子：
9.4
通讯作者：
Bowman, Keith J.
中科院分区：
文献类型：
--
作者：
Ehmke, Matthias C.;Schader, Florian H.;Bowman, Keith J.
研究了(Ba，Ca)(Ti，Zr)O-3铁电系统中跨准同相界成分的大信号应变响应随单轴压应力、电场和温度的变化。单极应变除以最大外加磁场的最大压电系数S-u/E-max为1540 pm V-1，明显超过了大多数锆钛酸铅材料的压电响应。超大的压电性出现在相图三方面上的准同型相界区域附近。在这种材料中，观察到了克服应力引起的磁畴钳制和获得可测量的应变响应所需的电场阈值电场。此外，研究表明，在25-75℃的温度范围内，仔细选择成分、应力和场幅，可以获得大于740 pm V-1的大信号压电系数。极大的单极应变响应可以归因于电场控制区域，在该区域中，单极压应力引起垂直于外加电场的非180度磁通翻转。在电加载过程中，电场可以将这些磁畴重新排列回平行方向，最大限度地实现非180度的磁畴切换，并增强单极应变。(C)2014 Acta Materialia Inc.由Elsevier Ltd.出版。保留所有权利。
The large signal strain response as a function of uniaxial compressive stress, electric field and temperature is investigated for compositions across the morphotropic phase boundary in the (Ba,Ca)(Ti,Zr)O-3 ferroelectric system. The largest piezoelectric coefficient in terms of unipolar strain divided by the maximum applied field, S-u/E-max, is 1540 pm V-1, which clearly exceeds the piezoelectric response of most lead zirconate titanate materials. The extraordinarily large piezoelectric properties occur in the vicinity of the morphotropic phase boundary region on the rhombohedral side of the phase diagram. In this material, an electric threshold field is observed that is required to overcome the stress-induced domain clamping and obtain a measurable strain response. Moreover, the study reveals that careful selection of composition, stress and field amplitude allow for large signal piezoelectric coefficients of over 740 pm V-1 in the temperature range of 25-75 degrees C. The extraordinarily large unipolar strain response can be assigned to an electric field-controlled regime, in which the unipolar compressive stress induces non-180 degrees domain switching perpendicular to the applied electric field. During electrical loading, the electric field can realign these domains back into the parallel direction, maximizing non-180 degrees domain switching and enhancing unipolar strain. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.