Open AccessA study on the properties of (Bi, La)4Ti3O12- Sr(Bi, La)4Ti4O15 intergrowth ferroelectrics
Author(s) -
Jing Zhu,
Lu Wang-Ping,
Liu Qiu-Chao,
Xu Mao,
Hui Yong Rong,
Xiaobing Chen
Publication year - 2003
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.52.2627
Subject(s) - materials science , ferroelectricity , doping , lanthanum , thermal stability , polarization (electrochemistry) , ceramic , crystal structure , diffraction , phase (matter) , analytical chemistry (journal) , condensed matter physics , crystallography , physics , optics , chemistry , composite material , dielectric , optoelectronics , chromatography , quantum mechanics , nuclear physics
Lanthanum_doped intergrowth ferroelectrics: (Bi,La)4Ti3O 12-Sr(Bi,La)4Ti4O15 (SrBi8-xLaxTi7O27) (x0.00, 0.25, 0.50, 0.75, 1.00, 1.25, 1.50) ceramic samples have been prepared by solid_state reaction m ethod. Their structure was analyzed by x_ray diffraction, and their dielectricit y and ferroelectricity were measured. It is found that La doping does not change the crystal structure of Bi4Ti3O12-SrBi4Ti4O15. The coerciv e field (EC) of SrBi8-xLaxTi7O2 7 increases slightly and the remnant polarization (2Pr) increases at first, then decreases with th e increas e of La content. The 2Pr reaches a maximum value of 25.6 μC·cm-2, whe n x is 0.50. The 2Pr increases nearly 60%, but the EC incr eases only about 10%, compared with those of SrBi8Ti7O27. Their temperatures of phase t ransition (TC) decrease with La doping. The TC of SrBi7.5La0.50Ti7O27 is 556 ℃ and shows good thermal stability. As x becomes 1.50, the SrBi7.5La0.50Ti7O27 exhibits a characteristic of relaxor ferroelectrics.