Research & Reviews: Journal of Material Sciences
MenuISSN:2321-6212
ISSN:2321-6212
Feng Gao, Qian Chen, Min Wang, Liangliang Liu and Shuyao Cao
Northwestern Polytechnical University, P.R. China
Posters & Accepted Abstracts: Res. Rev. J Mat. Sci
Lead-free ferroelectric materials especially niobate crystals and ceramics with tungsten bronze structure (TB) have attracted much more attention in recent years. KSr2Nb5O15 (KSN), with a full of TB structure, taking a higher Curie temperature (Tc) than Sr1-xBaxNb2O6, has shown a room-temperature electro-optic effect approximately seven times than that of LiNbO3. Thus KSN can be widely used in thermal sensitive element, electro-optic modulator and surface acoustic filters, etc. However, the piezoelectric and ferroelectric properties of KSN ceramics are not desirable, which has restricted the applications of material. In this work, well-developed 1-Dimentional rod-like KSN particles are fabricated by Molten Salt Synthesis, and textured KSN ceramics with highly grain orientation have been successfully produced by RTGG using the rod-like KSN particles as templates. The microstructure of KSN textured ceramics are analyzed by using XRD, SEM, Neutron Diffraction, Raman Spectra, and Piezo Response Force Microscopy (PFM). The formation mechanism of the oriented grain growth is discussed and the existence of domain structure with different polarization direction is certified by PFM analysis. gaofeng@nwpu.edu.cn