Title :
Conversion of 45° rotated X-cut KNbO3 plates to Y-cut plates by compression
Author :
Nakamura, Kiyoshi ; Chiba, Norihiro ; Ito, Shigeo
Author_Institution :
Dept. of Electr. & Commun. Eng., Tohoku Univ., Japan
Abstract :
Potassium niobate (KNbO3) single crystals with a pseudo-cubic structure exhibit very high piezoelectric coupling factors for thickness-extensional modes and surface acoustic waves, kt and kSAW. To obtain a better understanding of domain-behavior with a stress, conversion of high-kt 45° rotated X-cut plates of KNbO3 to high-kSAW Y-cut plates was attempted by applying a compressive force obliquely to the major surface of the plates. The X-ray diffraction analysis indicated that 90% of the 45° rotated X-cut plate were converted. The admittance response of the resulting plate was very close to that of a single-domain Y-cut plate. The domain evolution during application of a stress was observed and video-recorded using a developed system consisting of a polarizing microscope equipped with a stress application tool and a video camera. This observation showed that the conversion was occurred by a pressure of 6.6 MPa.
Keywords :
X-ray diffraction; crystal structure; electric domains; ferroelectric materials; optical microscopy; piezoelectric materials; piezoelectricity; plates (structures); potassium compounds; surface acoustic waves; 45° rotated X-cut KNbO3 plates; 6.6 MPa; KNbO3; X-ray diffraction analysis; admittance response; compression; domain evolution; piezoelectric coupling factors; polarizing microscope; pseudo-cubic structure; single crystals; single-domain Y-cut plate; stress application; surface acoustic waves; thickness-extensional modes; Acoustic waves; Admittance; Compressive stress; Crystals; High K dielectric materials; High-K gate dielectrics; Niobium compounds; Polarization; Surface acoustic waves; X-ray diffraction;
Conference_Titel :
Applications of Ferroelectrics, 2004. ISAF-04. 2004 14th IEEE International Symposium on
Print_ISBN :
0-7803-8410-5
DOI :
10.1109/ISAF.2004.1418346