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首页> 外文期刊>Journal of Materiomics >Effects of rare-earth dopants on phase structure and electrical properties of lead-free bismuth sodium titanate-based ceramics
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Effects of rare-earth dopants on phase structure and electrical properties of lead-free bismuth sodium titanate-based ceramics

机译：稀土掺杂剂对无铅铋钠陶瓷相结构和电性能的影响

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摘要

In this work, the effects of rare earth (RE) dopants on the phase structure, microstructure, and electrical properties of lead-free bismuth sodium titanate (BNT)-based ceramics were studied. Rare earth elements (i.e., Sm, Gd, Ho, Pr, Y, and Yb) were selected as the dopants to replace the Bi site of Bi_(0.5)(Na_(0.8)K_(0.2))_(0.5)TiO_(3) ceramics. It was found that the addition of moderate RE ions reduced the temperature of ferroelectric-relaxor transition ( T _(f-r)) and the dielectric maximum at lower temperature, while the slight influence on the dielectric maximum at higher temperature and microstructure were observed. Hereby, the three-stage evolution of phase structure after introducing RE ions was confirmed. A high piezoelectric coefficient d _(33) of ～190?pC/N was achieved due to the improved dielectric constant in the state with stable electric field-induced ferroelectric phase. The high strain property and converse piezoelectric coefficient d _(33)? of ～340?pm/V were obtained in the state with the coexistence of nonergodic and ergodic relaxor phases when T _(f-r) approached room temperature. The degenerated overall electromechanical properties exhibited in the state with complete ergodic relaxor phase. This study affords a significant guidance for optimizing the piezoelectricity of BNT-based ceramics utilizing rare earth dopants.
机译：在这项工作中，研究了稀土（RE）掺杂剂对无铅铋钠（BNT）基陶瓷的相结构，微观结构和电性能的影响。选择稀土元素（即，SM，GD，HO，PR，Y和YB）作为掺杂剂以替换Bi_（0.5）的BI态（Na_（0.8）K_（0.2））_（0.5）TiO_（ 3）陶瓷。结果发现，中等重新离子的添加​​降低了铁电 - 放松转变（T _（F-R））的温度和较低温度下的介电最大值，而观察到在较高温度和微观结构下对电介质最大值的略微影响。因此，确认了在引入RE离子后的相位结构的三阶段演变。由于具有稳定电场诱导的铁电相状态的状态下的改善介电常数，实现了〜190〜PC / N的高压电系数D _（33）。高应变性和逆转压电系数D _（33）？当T _（F-R）接近室温时，在状态下获得〜340〜PM / V的态度和ergodic弛豫阶段的阶段。在具有完全ergodic弛豫阶段的状态下表现出的退化的整体机电性能。该研究提供了利用稀土掺杂剂优化基于BNT的陶瓷的压电性的显着指导。

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