Achieving giant field-induced strain in BS-modified BNKT lead-free ferroelectric ceramics

被引:2
|
作者
Liu, Chang [1 ]
Li, Min [1 ,2 ]
Zheng, Tianyang [1 ]
Zhang, Tao [1 ]
Lyu, Chongguang [1 ]
Liu, Yunfei [1 ]
Lyu, Yinong [1 ]
机构
[1] Nanjing Tech Univ, Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM, Coll Mat Sci & Engn, State Key Lab Mat Oriented Chem Engn,,Jiangsu Coll, Nanjing 211816, Peoples R China
[2] Chizhou Univ, Chizhou 247000, Peoples R China
关键词
Large strain; BiScO3; BNKT ceramics; Dielectric properties; Relaxor ferroelectrics; ELECTRICAL-PROPERTIES; PHASE-TRANSITION; RELAXOR FERROELECTRICS; ELECTROSTRAIN; POLARIZATION; EVOLUTION; BEHAVIOR; FATIGUE; SN;
D O I
10.1016/j.sna.2024.115205
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Bi0.5Na0.5TiO3-Bi0.5K0.5TiO3 (BNT-BKT) binary systems with the morphotropic phase boundary (MPB) are promising candidates for piezoelectric actuators. However, pure BNT-BKT ceramics commonly exhibit unfavorable electric field-induced strain, which is insufficient to meet the requirements for actuator applications. Rare earth-containing dopants have been extensively explored to modify various materials due to their unique optical, magnetic, and electronic properties. Here, by introducing rare earth ion-containing dopants BiScO3 (BS), the electrical properties of Bi0.5(Na0.84K0.16)0.5TiO3 (BNKT) lead-free ferroelectric ceramics have been modified. X-ray diffraction (XRD) and scanning electron microscopy (SEM) results suggest that the introduction of BS results in an increase in tetragonal (T) phases, reduced grain sizes, and uniform morphologies. Ferroelectric measurements demonstrate that the BS-containing ceramics show slimmer hysteresis loops. The BNKT-2BS ceramics show a noteworthy improvement in electric field-induced strain, with bipolar and monopolar strains of 0.58% and 0.68%, respectively, which are almost 4 times and 6 times higher than those of pure BNKT ceramics. Furthermore, the corresponding normalized strain (d33*) also achieves high values of 967 pm/V and 1133 pm/V, respectively. Temperature-dependent dielectric measurements reveal that BS-containing ceramics exhibit good relaxor characteristics with frequency dispersion and diffuse phase transitions. This study presents a sufficient and feasible strategy for the optimization of strain performance in large displacement actuator applications.
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页数:7
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