p-type/n-type behaviour and functional properties of KxNa (1-x)NbO3 (0.49 <= x <= 0.51) sintered in air and N2

HUSSAIN, Fayaz, STERIANOU, Iasmi, KHESRO, Amir, SINCLAIR, Derek C. and REANEY, Ian. M. (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.

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Link to published version:: https://doi.org/10.1016/j.jeurceramsoc.2018.03.013

Abstract

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 N2 using a conventional mixed oxide route. Oxygen vacancies (VO..) played a major role in the semi-conduction mechanism in low p(O2) for all compositions. Impedance spectroscopy and thermo-power data confirmed KNN to be n-type in low p(O2) in contradiction to previous reports of p-type behaviour. The best piezoelectric properties were observed for air- rather than N2-sintered samples with d33=125 pC/N and kp=0.38 obtained for K0.51Na0.49NbO3.

Item Type: Article
Uncontrolled Keywords: p-type, n-type, low p(O2), oxygen vacancies, Seebeck coefficient
Departments: Faculty of Science, Technology and Arts > Engineering and Mathematics
Identification Number: https://doi.org/10.1016/j.jeurceramsoc.2018.03.013
Depositing User: Iasmi Sterianou
Date Deposited: 19 Mar 2018 14:15
Last Modified: 19 Mar 2018 14:23
URI: http://shura.shu.ac.uk/id/eprint/18948

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