Title :
The dielectric and piezoelectric properties of MBi4Ti4O15 (M=Sr, Sr0.5Ca0.5, Ca) ceramics
Author :
Kim, Ill-Won ; Ahn, Chang-Won ; Lee, Dae-Su ; Seo, Won-Kyung ; Kim, Dae-Yeon ; Lee, Jae-Shin
Author_Institution :
Dept. of Phys., Ulsan Univ., South Korea
Abstract :
We have investigated the crystalline structure, dielectric, ferroelectric and piezoelectric properties of the MBi4Ti4O15 (M=Sr, Ca, Sr0.5Ca0.5) ceramics. The remanent polarization(Pr) of SrBi4Ti4O15(SBT) and CaB14Ti4O15(CBT) ceramics was 2.2 μC/cm2 and 0.3 μC/cm2, respectively. The kt of SBT and CBT OF ceramics exhibited a low value(<4%) compared to that of PZT(60%), but Qm displayed a large value(>2000) compared to that of PZT(1000). The changes of dielectric, ferroelectric and piezoelectric properties in these ceramics have been originated from the lattice distortion of BO6 oxygen octahedra according to the size of ion radius into A site which are represented from (Bi2O2)2+(An-1BnO3n+1)2+ in the bismuth layered structure.
Keywords :
Q-factor; X-ray diffraction; bismuth compounds; calcium compounds; dielectric hysteresis; dielectric losses; dielectric polarisation; ferroelectric ceramics; permittivity; piezoceramics; powder technology; scanning electron microscopy; sintering; strontium compounds; CaBi4Ti4O15; SEM; Sr0.5Ca0.5Bi4Ti4O15; SrBi4Ti4O15; XRD patterns; ball-milled; bismuth-layered structure; ceramics; crystalline structure; dielectric constant; dielectric loss; dielectric properties; electromechanical coupling factor; ferroelectric properties; grain orientation factor; hysteresis loops; lattice distortion; mechanical quality factor; piezoelectric properties; remanent polarization; sintered; Biological materials; Ceramics; Dielectric materials; Ferroelectric materials; Hafnium; Piezoelectric materials; Powders; Scanning electron microscopy; Strontium; X-ray scattering;
Conference_Titel :
Science and Technology, 2002. KORUS-2002. Proceedings. The 6th Russian-Korean International Symposium on
Print_ISBN :
0-7803-7427-4
DOI :
10.1109/KORUS.2002.1028020
