利用传统固相法制备了(1- x)Bi(Sc1- yY y)O3- xPbTiO3(BSYPT- x/y)压电陶瓷, 采用XRD、SEM、压电工作站等技术表征了体系的晶体结构、微观组织及其铁电性能. 发现随着PbTiO3含量的增加, BYSPT- x/ y陶瓷相结构由三方结构逐渐转变为四方结构. 体系的准同型相界(MPB)位置随BiYO3含量的增加而移向PbTiO3含量更低的一端. 在准同型相界附近的BSYPT0.58/0.15陶瓷的电滞回线出现“束腰”现象, 这种现象来源于BSYPT0.58/0.15陶瓷内部产生的正极为O2 - , 负极为Y3+的缺陷偶极子.
(1- x)Bi(Sc1- yY y)O3- xPbTiO3(BSYPT- x/y) ceramics were prepared by theconventional mixed oxide method, and their crystal structure, microstructure, andferroelectric properties were investigated. XRD analyses show that the crystalstructure of BSYPT- x/y ceramicschanges from rhombohedral to tetragonal symmetry with increasing of PbTiO3amount. The introduction of BiYO3 into BiScO3-PbTiO3solid solution would cause a shift of morphotropic phase boundary (MPB) of BSYPT- x/y system from x=0.62, y=0.05 to x=0.56, y=0.20. The BYSPT- x/ y ceramics with x=0.58 and y=0.15 showthe pinched hysteresis loops, which can be attributed to the pinned domainwalls of the dipolar defects following the substitution of Sc3+ and Ti4+ions for Y3+ ions in B site of BYSPT system.
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