CAJ | 학술논문

采用固相法制备了 Bi 补偿的(0.84-x) Na0.5Bi0.5TiO3-0.16K0.5Bi0.5TiO3-xSrTiO3(简称NBT-KBT-xST)无铅压电陶瓷,研究不同 ST 掺量对体系陶瓷的结构与电性能的影响规律。结果表明,在掺杂范围内(0≤x≤0.06),材料均能形成单一的钙钛矿固溶体结构。随着x 的增加,陶瓷晶体结构逐渐由三方相向四方相过渡,且该体系的三方-四方准同型相界(MPB)位于0.03≤x ≤0.04。在此组成区域内,体系陶瓷的铁电与压电性能较好,其中x=0.04时,材料的电性能较好：压电常数d33=156 pC/N,平面机电耦合系数kp=0.29,相对介电常数εr=1116,介质损耗 tanδ=4.1%,剩余极化强度Pr=30.5μC/cm2,矫顽场Ec=23.9 kV/cm。介电温谱和变温电滞回线表明体系陶瓷在Td 以上可能存在极性相与非极性相共存。
채용고상법제비료 Bi 보상적(0.84-x) Na0.5Bi0.5TiO3-0.16K0.5Bi0.5TiO3-xSrTiO3(간칭NBT-KBT-xST)무연압전도자,연구불동 ST 참량대체계도자적결구여전성능적영향규률。결과표명,재참잡범위내(0≤x≤0.06),재료균능형성단일적개태광고용체결구。수착x 적증가,도자정체결구축점유삼방상향사방상과도,차해체계적삼방-사방준동형상계(MPB)위우0.03≤x ≤0.04。재차조성구역내,체계도자적철전여압전성능교호,기중x=0.04시,재료적전성능교호：압전상수d33=156 pC/N,평면궤전우합계수kp=0.29,상대개전상수εr=1116,개질손모 tanδ=4.1%,잉여겁화강도Pr=30.5μC/cm2,교완장Ec=23.9 kV/cm。개전온보화변온전체회선표명체계도자재Td 이상가능존재겁성상여비겁성상공존。
Bi-compensated (0.84-x)Na0.5Bi0.5TiO3-0.16K0.5Bi0.5TiO3-xSrTiO3 (abbreviated as NBT-KBT-xST)lead-free piezoelectric ceramics were prepared by solid-state reactions.The effects of SrTiO3 dopants on the structure and electrical properties of ceramic samples were investigated.The results indicated that solid so-lutions with pure perovskite structure were formed after SrTiO3-doping.The phase structures of the ceramics at room temperature changed from rhombohedral to tetragonal phases as increasing the SrTiO3 contents,and a morphotropic phase boundary (MPB)of the system was found to be 0.03 ≤x≤ 0.04,where good ferroelectric and piezoelectric properties were obtained.When x=0.04,the ceramics exhibit the best physical performance:the piezoelectric constant d33=156 pC/N,planar coupling factor kp=0.29,relative dielectric constantεr=1 116,dielectric loss tanδ=4.1%,remnant polarization Pr=30.5μC/cm2 ,coercive field Ec=23.9 kV/cm. The temperature dependences of dielectric and ferroelectric properties indicate that the ceramics may contain both the polar and non-polar regions at temperatures above the de-polarized temperature (Td).