(Bi,La)4Ti3O12-Sr(Bi,La)4Ti4O15共生结构铁电材料性能研究

采用固相烧结工艺，制备了不同La掺杂量(x=0.00，0.25，0.50，0.75，1.00，1.25和1.50) 的(Bi, La)₄Ti₃O₁₂-Sr(Bi, La)₄Ti4O₁₅ (SrBi_8-xLa_xT i₇O₂₇)共生结构铁电陶瓷样品.用x射线衍射对其进行微结构分析 ，并测量铁关键词：4Ti₃O₁₂-SrBi₄Ti₄O₁₅')" href="#">Bi₄Ti₃O₁₂-SrBi₄Ti_{4O15La掺杂铁电性能居里温度弛豫铁电}

A study on the properties of (Bi, La)4Ti3O12- Sr(Bi, La)4Ti4O15 intergrowth ferroelectrics

Lanthanum_doped intergrowth ferroelectrics: (Bi,La)₄Ti₃O ₁₂-Sr(Bi,La)₄Ti₄O₁₅ (SrBi_8-xLa_xTi₇O₂₇) (x＝0.00, 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-SrBi_{4< /sub>Ti4O15. 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.}