CAJ | 학술논문

采用传统电子陶瓷制备工艺获得无铅压电陶瓷(1-x)(0.8Na0.5Bi0.5TiO3-0.2K0.5Bi0.5TiO3)-xLi0.5 Bi0.5 TiO3(NBT-KBT-xLBT),研究了该材料的相结构、介电、铁电及压电性能。结果表明,NBT-KBT中引入LBT形成了单相钙钛矿固溶体,LBT 的引入量为0.08≤x≤0.10时,该体系处于准同型相界处；随着LBT的引入量增加,陶瓷的烧结温度显著降低,介电温度异常峰对应的退极化温度Tf向高温方向移动,而铁电-顺电相变峰Tm则向低温方向移动,弛豫铁电相变特征也表现得更为明显,对弛豫相变与 A 位离子的局域分布不均匀及其在原子尺度上的有序无序排布之间的关联进行了初步探讨；在 NBT-KBT 体系中引入LBT有助于改善其铁电性能,提高压电活性,矫顽场Ec 从14.5 kV/cm(x=0.06)降低至12.3 kV/cm (x=0.12),在准同型相界处(x=0.10),压电常数d33达到了145 pC/N。LBT 组分引入到 NBT-KBT体系中可获得高压电常数及低矫顽场的无铅压电材料。
채용전통전자도자제비공예획득무연압전도자(1-x)(0.8Na0.5Bi0.5TiO3-0.2K0.5Bi0.5TiO3)-xLi0.5 Bi0.5 TiO3(NBT-KBT-xLBT),연구료해재료적상결구、개전、철전급압전성능。결과표명,NBT-KBT중인입LBT형성료단상개태광고용체,LBT 적인입량위0.08≤x≤0.10시,해체계처우준동형상계처；수착LBT적인입량증가,도자적소결온도현저강저,개전온도이상봉대응적퇴겁화온도Tf향고온방향이동,이철전-순전상변봉Tm칙향저온방향이동,이예철전상변특정야표현득경위명현,대이예상변여 A 위리자적국역분포불균균급기재원자척도상적유서무서배포지간적관련진행료초보탐토；재 NBT-KBT 체계중인입LBT유조우개선기철전성능,제고압전활성,교완장Ec 종14.5 kV/cm(x=0.06)강저지12.3 kV/cm (x=0.12),재준동형상계처(x=0.10),압전상수d33체도료145 pC/N。LBT 조분인입도 NBT-KBT체계중가획득고압전상수급저교완장적무연압전재료。
(1-x)(0.8Na0.5 Bi0.5 TiO3-0.2K0.5 Bi0.5 TiO3 )-xLi0.5Bi0.5TiO3 (NBT-KBT-xLBT)lead-free piezo-e-lectric ceramics were prepared by the conventional ceramic preparation method.Crystal structure,dielectric, ferroelectric and piezoelectric properties of the ceramics were investigated.According to XRD patterns,the morphotropic boundary lies in the composition range of 0.08≤x≤0.10.The temperature dielectric anomalous peak Tf which was corresponding to the depolarization temperature towards to higher temperature while the fer-roelectric-paraelectric phase transition peak Tm shift towards to lower temperature.Relaxor phase transition characteristics become stronger.The relationship between relaxation phase transition characteristics and A-site local structure are further discussed based on inhomogeneous distribution and disorder range in atomic scale. The ferroelectric properties of the NBT-KBT ceramics are further improved with the introduction of the LBT content.And the coercive field Ec decreases from 14.5 kV/cm (x=0.06)to 12.3 kV/cm (x=0.12).The pie-zoelectric activity was enhanced with an increase in LBT content and piezoelectric constant d33 reaches 145 pC/N at the morphotropic phase boundary(x=0.10).The lower sintering temperature,higher d33 and lower Ec value for NBT-KBT system could be obtained by the LBT incorporation.