Relaxor Ferroelectricity and Electrostrictive Behavior of KNN-ST Ceramics

Abstract:

The new electrostrictive ceramics have been produced from the (1-x) K0.5Na0.5NbO3-xSrTiO3 (KNN-ST, x=0.1-0.25) system by using conventional mixed-oxide methods. Sintering temperatures rise with increasing SrTiO3 content (x=0.1-0.25) and are in a very narrow range. The x-ray diffraction patterns indicate that with the increasing of SrTiO3 up to 0.25, KNN-ST ceramics with a single perovskite structure exhibit a transition from orthorhombic to cubic and no other impure phase appeared. The dielectric and relaxor ferroelectric properties of KNN-ST ceramics are investigated with the different SrTiO3 content. Also, the strain of these ceramics induced by applied electric fields have been studied. The electrostrictive response is similarly as in the classical PMN (lead magnesium niobate), but lower (order of the 10-5) than PMN (order of the 10-3). Furthermore, this system shows translucent, high dielectric constant, thus suggests possible applications in electric-optic devices, electromechanical transducer applications.

• Periodical: Materials Science Forum (Volumes 654-656)
• Pages: 1978-1981
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.654-656.1978
• Online since: June 2010
• Authors: Hui Qing Fan, Zhuo Li, Peng Rong Ren, Gang Cheng Jiao
• Keywords: Dielectric Property, Electrostrictive Behavior, KNN-ST, Relaxor Ferroelectric

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