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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Phase transition, switching characteristics of MPB compositions and large strain in lead-free (Bi0.5Na0.5)TiO3-based piezoceramics
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Phase transition, switching characteristics of MPB compositions and large strain in lead-free (Bi0.5Na0.5)TiO3-based piezoceramics

机译：相转移，MPB组合物的切换特性和无铅（BI0.5NA0.5）TiO3的压电陶瓷中的大菌株

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摘要

In this study, the switching characteristics of MPB compositions of (1-x-y)(Bi0.5Na0.3)TiO3-xKNbO(3)-ySr-TiO3 (abbreviated as BNT-KN-ST) and temperature- and composition-driven strain behavior, dielectric, ferroelectric (FE), piezoelectric, and pyroelectric properties were systematically explored to achieve lead-free piezoelectric materials with large strain response for practical applications of piezoelectric actuators. The piezoelectric coefficient (d(33)) declined dramatically and normalized strain S-max/E-max increased markedly as the morphotropic phase boundary (MPB) compositions shifted away from the MPB (I) into the MPB (II) where the ferroelectric rhombohedral and relaxor pseudo-cubic phases coexisted at around critical composition. The critical compositions for the indicated system exhibited enhanced strain response, and at room temperature a high strain of 0.34% with normalized strain Smax/Emax = 486 p.m./V was gained for the critical composition 0.90BNT-0.05KN-0.05ST. The source of the achieved large strain was sought based on the X-ray diffraction (XRD) and Raman-spectra structure analysis, macroscopic properties, thermal depolarization progress, and temperature-dependent correlations of both polarization and strain, and the results indicated that it derived from the phase transformation contribution from ergodic relaxor (ER) to FE phases. Moreover, the present work also established the relationship between the MPB composition and tolerance factor t in BNT-based ceramics, and demonstrated that the t corresponding to the formation of MPB located in a quite narrow range. As a result, we believe that this study will open the door to quickly detect the approximate MPB region for BNT-based solid solutions. (C) 2017 Elsevier B.V. All rights reserved.
机译：在该研究中，（1-xy）（Bi0.5na0.3）TiO3-XKNBO（3）-ySR-TiO3（缩写为BNT-KN-ST）和温度和组成驱动应变的切换特性系统地探索了行为，电介质，铁电（Fe），压电和热电性能，实现具有大应变响应的无铅压电材料，对压电致动器的实际应用。压电系数（D（33））显着下降，归一化菌株S-MAX / E-MAX随着Morphotopic期边界（MPB）组合物从MPB（I）移入铁电菱体的MPB（II）和放松伪立方阶段在临界组成周围共存。所示系统的临界组合物表现出增强的应变响应，并且在室温下，高应变为0.34％，具有归一化菌株Smax / Emax = 486下午9./v，用于临界组合物0.90bnt-0.05kn-0.05st。基于X射线衍射（XRD）和拉曼光谱结构分析，宏观性质，热去极化进展和偏振和菌株的温度相关的相关性，结果表明，所达到的大菌株的来源，结果表明它从ergodic松弛剂（ER）到Fe阶段的相变贡献。此外，本作者还建立了基于BNT的陶瓷中MPB组成和耐受因子T之间的关系，并证明了与位于相当窄的范围内的MPB的形成。因此，我们认为这项研究将打开门以快速检测基于BNT的固体解决方案的近似MPB区域。 （c）2017年Elsevier B.V.保留所有权利。

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