Da Huang , Cheng Liu , Qin Yu , Hengrui Wang , Hongxi Chen , Dainan Zhang , Huaiwu Zhang
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引用次数: 0
摘要
本研究采用固相反应法制备了致密的Pb(1-x)K2x[Nb0.96Ta0.04]2O6 （PKxNT, x = 0.05,0.10,0.15,0.20）陶瓷。发现K+填充的a位空位诱导四方钨青铜（TTB）结构由“未填充”向“填充”转变。通过XRD谱图确定了两种正交铁电相。晶粒形貌由等轴向柱状转变，并观察到扩散相变（DPT）行为。PbK0.20NT样品的压电性能（d33 = 141 pC/N）得到改善，介质损耗（tanδ = 0.009）得到降低。结果表明，K+/Ta5+共取代策略可显著提高pbnb2o6基陶瓷的压电性能，拓展其应用领域。
Improved piezoelectric performance of PbNb2O6-based ceramics via K+ modification
In this study, dense Pb(1-x)K2x[Nb0.96Ta0.04]2O6 (PKxNT, x = 0.05, 0.10, 0.15, 0.20) ceramics were prepared via the solid-state reaction method. It was discovered that the A-site vacancies filled by K+ induced the conversion of the tetragonal tungsten bronze (TTB) structure from “unfilled” to “filled”. Two kinds of orthorhombic ferroelectric phases were indexed from the XRD profiles. The grain morphology was transformed from equiaxed to columnar and the diffuse phase transition (DPT) behavior was observed. Improved piezoelectric performance (d33 = 141 pC/N) and reduced dielectric loss (tanδ = 0.009) were obtained in the sample of PbK0.20NT. It is suggested that the strategy of K+/Ta5+ co-substitution could greatly improve the piezoelectric properties of the PbNb2O6-based ceramic, which is promising for expanding its application scenarios.
期刊介绍：
The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.
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