Piezoelectric materials for high power, high temperature applications
Piezoelectric materials for high power, high temperature applications
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DOI：
10.1016/j.matlet.2005.06.016
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发表时间：
2005-11-01
影响因子：
3
通讯作者：
Shrout, TR
中科院分区：
文献类型：
--
作者：
Zhang, SJ;Xia, R;Shrout, TR
高强度聚焦超声 (HIFU) 和超声引导 HIFU 治疗需要既能提供高质量诊断成像又能将高声功率辐射到组织中的探头。需要具有高机械品质因数 Q、大机电耦合 (k(ij)) 和高介电常数 K-T 的压电材料来满足先进的高功率机电应用的需求。此外，由于更宽的温度使用范围和改进的温度稳定性，需要高居里温度。先前的研究表明，Q 或 k(ij) 和 K-T 的增强只能以牺牲彼此为代价。还发现居里温度较高的材料具有较低的介电和压电性能。因此，改性压电材料（包括多晶和单晶）作为居里温度的函数进行了审查。性能优化以接近同型相界 (MPB) 的 Pb(Sc1/2Nb1/2)O-3-PbTiO3 (PSNT) 组合物为例，以及锰添加物分别对 Q、耦合 k(33) 和 K-T 的影响。 (C) 2005 Elsevier B.V. 保留所有权利。
High intensity focused ultrasound (HIFU) and ultra sound-guided HIFU therapy require probes capable of both high quality diagnostic imaging and radiating high acoustic power into tissue. Piezoelectric materials with high mechanical quality factor Q, large electromechanical coupling (k(ij)) and high dielectric constant K-T are desired to meet the demands of advanced high power electromechanical applications. In addition, a high Curie temperature is desired because of wider temperature usage and improved temperature stability. Previous investigations have shown that Q or k(ij) and K-T can be enhanced only at the expense of each other. Also materials with higher Curie temperature were found to possess lower dielectric and piezoelectric performance. Therefore, modified piezoelectric materials (including polycrystalline and single crystals) were reviewed as a function of Curie temperature. Optimization of performance was exemplified with Pb(Sc1/2Nb1/2)O-3-PbTiO3 (PSNT) compositions close to the morphotropic phase boundary (MPB) and the effect of manganese additions on Q, coupling k(33) and K-T, respectively. (C) 2005 Elsevier B.V. All rights reserved.