The effect of A site non-stoichiometry on 0.94(NayBix)TiO3-0.06BaTiO3
The effect of A site non-stoichiometry on 0.94(NayBix)TiO3-0.06BaTiO3
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DOI：
10.1016/j.jeurceramsoc.2016.11.045
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发表时间：
2017-04
影响因子：
5.7
通讯作者：
I. Seo;S. Steiner;T. Frömling
中科院分区：
文献类型：
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作者：
I. Seo;S. Steiner;T. Frömling
无铅压电陶瓷的缺陷化学的良好知识，使机电性能和微观结构的控制。特别是对于（NayBix）TiO 3，已经表明某些受体掺杂和Bi缺乏导致氧离子电导率大大增加，使其不适合压电应用。在这项工作中，重点是更相关的0.94（NayBix）TiO 3 - 0.06BaTiO 3（NyBxT-BT）固溶体。由于Bi缺乏，电导率增加，但其远不如纯NBT广泛。虽然Bi缺乏导致NBT材料的主要离子贡献，但电子电导率仍然可以是NBT-BT的主要贡献。然而，不仅电导率或介电损耗的存在下的缺陷，而且晶粒生长和压电常数的影响。因此，化学计量比的控制是非常重要的，并提供了一种新的方式来修改的压电响应。
A good knowledge of the defect chemistry of a lead free piezoelectric ceramic enables the control of electromechanical properties and microstructure. Especially for (NayBix)TiO3, it was already shown that certain acceptor doping and Bi deficiency lead to vastly increased oxygen ionic conductivity rendering it unsuitable for piezoelectric applications. In this work, the focus is on the more relevant 0.94(NayBix)TiO3-0.06BaTiO3(NyBxT-BT) solid solution. There is an increase in conductivity due to Bi deficiency but it is by far not as extensive as for pure NBT. While Bi deficiency leads to a dominating ionic contribution for NBT material, electronic conductivity can still be dominant for NBT-BT. However, not only the conductivity or dielectric loss is influenced by the presence of defects, but also the grain growth and piezoelectric constants. Hence, the control of the stoichiometry is very important and offers a new way to modify the piezoelectric response.