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Defect Structure of Doped Lead-Free 0.9(Bi0.5Na0.5)TiO3−0.1(Bi0.5K0.5)TiO3Piezoceramics

Blömker, Martin and Erdem, Emre and Li, Shunyi and Weber, Stefan and Klein, Andreas and Rödel, Jürgen and Frömling, Till (2016):
Defect Structure of Doped Lead-Free 0.9(Bi0.5Na0.5)TiO3−0.1(Bi0.5K0.5)TiO3Piezoceramics.
In: Journal of the American Ceramic Society, pp. 543-550, 99, (2), ISSN 00027820,
[Online-Edition: http://dx.doi.org/10.1111/jace.13999],
[Article]

Abstract

Cu- and V-doped BNKT10-based piezoelectric ceramics with up to 0.5 at.% dopant concentration were synthesized and displayed more homogeneous grain growth compared to undoped BNKT10 ceramics. The defect chemistry and defect structure, studied by X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR), indicate a slightly rhombic electronic environment with major unidirectional octahedral distortion of the local environment of Cu. The solubility limit of Cu2+ in this material system is lower than 0.05 at.% Cu; above this limit, a Cu segregation at the grain boundaries is prevalent, unlike in PZT and KNN. Here, V was shown to be incorporated into the perovskite lattice and possess oxidation states of +4 and +5, acting both as isovalent and donor dopant, predominantly compensated by A-site vacancies. A trend toward higher ceramic densities, higher maximum polarization, and higher remanent polarization with increasing Cu concentration was observed. A maximum mechanical coupling factor could be obtained in the case of doping with 0.4 at.% V and 0.1 at.% Cu with a planar coupling of 0.19 and a thickness coupling factor of 0.56.

Item Type: Article
Erschienen: 2016
Creators: Blömker, Martin and Erdem, Emre and Li, Shunyi and Weber, Stefan and Klein, Andreas and Rödel, Jürgen and Frömling, Till
Title: Defect Structure of Doped Lead-Free 0.9(Bi0.5Na0.5)TiO3−0.1(Bi0.5K0.5)TiO3Piezoceramics
Language: German
Abstract:

Cu- and V-doped BNKT10-based piezoelectric ceramics with up to 0.5 at.% dopant concentration were synthesized and displayed more homogeneous grain growth compared to undoped BNKT10 ceramics. The defect chemistry and defect structure, studied by X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR), indicate a slightly rhombic electronic environment with major unidirectional octahedral distortion of the local environment of Cu. The solubility limit of Cu2+ in this material system is lower than 0.05 at.% Cu; above this limit, a Cu segregation at the grain boundaries is prevalent, unlike in PZT and KNN. Here, V was shown to be incorporated into the perovskite lattice and possess oxidation states of +4 and +5, acting both as isovalent and donor dopant, predominantly compensated by A-site vacancies. A trend toward higher ceramic densities, higher maximum polarization, and higher remanent polarization with increasing Cu concentration was observed. A maximum mechanical coupling factor could be obtained in the case of doping with 0.4 at.% V and 0.1 at.% Cu with a planar coupling of 0.19 and a thickness coupling factor of 0.56.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 99
Number: 2
Divisions: 11 Department of Materials and Earth Sciences
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 > Material Science > Surface Science
Date Deposited: 15 Jan 2016 16:06
Official URL: http://dx.doi.org/10.1111/jace.13999
Identification Number: doi:10.1111/jace.13999
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