Hussain, F., Sterianou, I., Khesro, A. et al. (2 more authors) (2018) p-Type/n-type behaviour and functional properties of KxNa(1-x)NbO3 (0.49 ≤ x ≤ 0.51) sintered in air and N2. Journal of the European Ceramic Society, 38 (9). pp. 3118-3126. ISSN 0955-2219
Abstract
Potassium sodium niobate (KNN) is a potential candidate to replace lead zirconate titanate in sensor and actuator applications but there are many fundamental science and materials processing issues to be understood before it can be used commercially, including the influence of composition and processing atmosphere on the conduction mechanisms and functional properties. Consequently, KNN pellets with different K/Na ratios were sintered to 95% relative density in air and N 2 using a conventional mixed oxide route. Oxygen vacancies (V O •• ) played a major role in the semi-conduction mechanism in low p(O 2 ) for all compositions. Impedance spectroscopy and thermo-power data confirmed KNN to be n-type in low p(O 2 ) in contradiction to previous reports of p-type behaviour. The best piezoelectric properties were observed for air- rather than N 2 -sintered samples with d 33 = 125 pC/N and k p = 0.38 obtained for K 0.51 Na 0.49 NbO 3 .
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 Elsevier. This is an author produced version of a paper subsequently published in Journal of the European Ceramic Society. Uploaded in accordance with the publisher's self-archiving policy. Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
Keywords: | p-Type; n-Type; Low p(O2); Oxygen vacancies; Seebeck coefficient |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 12 Apr 2018 15:02 |
Last Modified: | 17 Nov 2020 08:52 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.jeurceramsoc.2018.03.013 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:129467 |