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The effect of A site non-stoichiometry on 0.94(NayBix)TiO3-0.06BaTiO3

Seo, In-Tae and Steiner, Sebastian and Frömling, Till (2017):
The effect of A site non-stoichiometry on 0.94(NayBix)TiO3-0.06BaTiO3.
In: Journal of the European Ceramic Society, Elsevier, pp. 1429-1436, 37, ISSN 09552219, [Article]

Abstract

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.

Item Type: Article
Erschienen: 2017
Creators: Seo, In-Tae and Steiner, Sebastian and Frömling, Till
Title: The effect of A site non-stoichiometry on 0.94(NayBix)TiO3-0.06BaTiO3
Language: English
Abstract:

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.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 37
Publisher: Elsevier
Uncontrolled Keywords: Piezoelectric; Lead-free; A site non-stoichiometry; Conductivity; NBT-BT
Divisions: 11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences
Date Deposited: 23 Jan 2017 07:09
Identification Number: doi:10.1016/j.jeurceramsoc.2016.11.045
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