Title :
Phase transition of ferroelectric (Na1/2Bi1/2)TiO3
Author :
Park, Seung-Eek ; Chung, Su-Jin
Author_Institution :
Dept. of Inorg. Mater. Eng., Seoul Nat. Univ., South Korea
Abstract :
Crystals of (Na1/2Bi1/2)TiO3 were grown by flux technique as well as Czochralski method. It has been found that non-stoichiometry which was induced during the crystal growth by the Czochralski method owing to the volatilization of the Bi-rich phase resulted in less lattice distortion from cubic symmetry. A long-range cationic ordering was also found in both crystals but the degree of ordering was very low. It was confirmed that the tetragonal phase should be nonpolar. On the base of these results, the phase transition behaviors of two NBT crystals have been investigated with the observation of twin configuration
Keywords :
bismuth compounds; crystal growth from melt; crystal growth from solution; crystal symmetry; ferroelectric materials; ferroelectric transitions; long-range order; sodium compounds; stoichiometry; twin boundaries; (NaBi)TiO3; Czochralski method; cubic symmetry; ferroelectric (Na12/Bi12/)TiO3; flux technique; lattice distortion; long-range cationic ordering; nonstoichiometry; phase transition; tetragonal phase; twin boundaries; Bismuth; Cooling; Crystals; Dielectric measurements; Diffraction; Ferroelectric materials; Frequency measurement; Heating; Powders; Temperature;
Conference_Titel :
Applications of Ferroelectrics, 1994.ISAF '94., Proceedings of the Ninth IEEE International Symposium on
Conference_Location :
University Park, PA
Print_ISBN :
0-7803-1847-1
DOI :
10.1109/ISAF.1994.522354
