Doubling up piezoelectric performance

IF 45.8 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2019-04-19 DOI:10.1126/science.aax0693

Jiří Hlinka

引用次数: 2

Abstract

Piezoelectrics change in length when an electric field is applied, and good materials have large piezoelectric coefficients, the ratio of elongation to applied field strength. The most advanced piezoelectric devices, such as underwater sonars and medical ultrasound imaging instruments, typically use a perovskite oxide crystal, Pb(Mg_1/3Nb_2/3)O₃-PbTiO₃ (PMN-PT). The properties and manufacture of this material have been optimized in the past 20 years (1–4). The increase of the piezoelectric coefficient of PMN-PT by a factor of 2 (to ∼4000 pC/N), reported on page 264 of this issue by Li et al. (5), is thus an unexpected result. The authors achieved this improved piezoelectric performance by adding only about one samarium (Sm) atom per thousand atoms of the parent PMN-PT crystal, and the piezoelectric properties of this doped crystal are more homogeneous than those of the undoped material.

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加倍压电性能

当施加电场时，压电体的长度会发生变化，好的材料具有较大的压电系数，即伸长率与施加电场强度之比。最先进的压电设备，如水下声纳和医疗超声成像仪器，通常使用一种包晶氧化物晶体，即 Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT)。在过去的 20 年中，这种材料的性能和制造工艺得到了优化（1-4）。因此，本期第 264 页报道的 Li 等人 (5) 将 PMN-PT 的压电系数提高了 2 倍（达到 ∼4000 pC/N）是一个意想不到的结果。作者通过在母体 PMN-PT 晶体中每千个原子只添加约一个钐 (Sm) 原子来实现压电性能的提高，而且这种掺杂晶体的压电特性比未掺杂材料的压电特性更加均匀。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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