期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 38, 期 9, 页码 3118-3126出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2018.03.013
关键词
p-Type; n-Type; Low p(O-2); Oxygen vacancies; Seebeck coefficient
资金
- NED University of Engineering and Technology, Pakistan
- Abdul Wali Khan University Mardan, Pakistan
- Sustainability and Substitution of Functional Materials and Devices EPSRC [EP/L017563/1]
- EPSRC [EP/L017563/1] Funding Source: UKRI
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 (VO center dot center dot) 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 K0.51Na0.49NbO3.
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