Piezoelectric properties of (K0.5Na0.5)NbO3-BaTiO3 lead-free ceramics prepared by spark plasma sintering

被引：20
|
作者：
Men, Tian-Lu [1 ]
Yao, Fang-Zhou [1 ]
Zhu, Zhi-Xiang [2 ]
Wang, Ke [1 ]
Li, Jing-Feng [1 ]
机构：
[1] Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
[2] State Grid Smart Grid Res Inst, Dept New Elect Mat, Beijing 102209, Peoples R China
来源：
JOURNAL OF ADVANCED DIELECTRICS | 2016年 / 6卷 / 02期
关键词：
(K; Na)NbO3; BaTiO3; piezoelectric ceramics; spark plasma sintering;
D O I：
10.1142/S2010135X16500132
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
(K,Na)NbO3 (KNN)-based lead-free piezoceramics have been the spotlight in search for practically viable candidates to replace the hazardous but dominating lead-containing counterparts. In this work, BaTiO3 (BT) modified KNN ceramics were fabricated by spark plasma sintering (SPS) and the influence of BT content as well as sintering temperature on the phase structure, microstructure, and electrical properties were investigated. It was found that the 0.96(Na0.5K0.5)NbO3-0.04BaTiO(3) (BT4) ceramics sintered at 1000 degrees C have the optimal performance. Additionally, in-depth analysis of the electrical hysteresis revealed that the internal bias field originating from accumulation of space charges at grain boundaries is responsible for the asymmetry in the hysteresis loops.
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页数：8
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