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	Ferroelectric properties of Na0.5K0.5NbO3 films at low temperatures
	Zhang, ZG ; Khartsev, SI ; Grishin, AM
	2010-05-07 ; 2010-05-07
会议名称	INTEGRATED FERROELECTRICS ; 16th International Symposium on Integrated Ferroelectrics/5th Korean Workshop on High Dielectric Devices and Materials ; Gyeongju, SOUTH KOREA ; Web of Science
关键词	ferroelectric domain dielectric dissipation BATIO3 THIN-FILMS DIELECTRIC-PROPERTIES ELECTRICAL-PROPERTIES RELAXOR BEHAVIOR FREQUENCY Engineering, Electrical & Electronic Physics, Applied Physics, Condensed Matter
中文摘要	The temperature dependence of polarization and dielectric behaviour of Na0.5K0.5NbO3 thin films were studied from 25 K to room temperature. NKN films were deposited on Pt80Ir20 substrates by RF-magnetron sputtering. The freezing of domain walls with decreasing temperature makes domain walls switching difficult and suppresses the domain walls vibration. Both saturation remanent polarization and coercive field increased with decreasing the temperature. A pronounced low-temperature dielectric relaxation process was observed below 100 K; the relaxation rate fellows the Arrhenius law. Low temperature dielectric behaviour has been studied for the NKN films at various frequencies and bias electrical fields. Constant phase element model is introduced and can interpret the dielectric behaviour well. Dielectric constant, ac conductivity, loss tangent and universal law dielectric equation can be easily deduced from our model. The measured loss tangent and fitted result at various temperature and bias electrical fields agreed very well for our NKN films.
会议录出版者	TAYLOR & FRANCIS LTD ; ABINGDON ; 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND
语种	英语 ; 英语
内容类型	会议论文
源URL	[http://hdl.handle.net/123456789/16826]
专题	清华大学
推荐引用方式 GB/T 7714	Zhang, ZG,Khartsev, SI,Grishin, AM. Ferroelectric properties of Na0.5K0.5NbO3 films at low temperatures[C]. 见:INTEGRATED FERROELECTRICS, 16th International Symposium on Integrated Ferroelectrics/5th Korean Workshop on High Dielectric Devices and Materials, Gyeongju, SOUTH KOREA, Web of Science.

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