Piezoelectric properties of (Li, Sb, Ta) modified (Na,K)NbO3 lead-free ceramics

被引:129
作者
Ming, Bao-Quan [1 ]
Wang, Jin-Feng [1 ]
Qi, Peng [1 ]
Zang, Guo-Zhong [1 ]
机构
[1] Shandong Univ, Sch Phys & Microelect, State Key Lab Crystal Mat, Jinan 250100, Peoples R China
基金
中国国家自然科学基金;
关键词
D O I
10.1063/1.2436923
中图分类号
O59 [应用物理学];
学科分类号
摘要
Lead-free alkaline niobate based (Na0.52K0.48-xLix)Nb1-x-ySbxTayO3 piezoceramics have been prepared by the conventional mixed oxide method without using other techniques. An experimental formula for producing a set of ceramics with high piezoelectric properties is obtained while cutting down the Ta content and maintaining a high Curie temperature. The highest piezoelectric constant d(33) is 308 pC/N, with a dielectric loss tan delta of about 2.0% and a Curie temperature of 339 degrees C. The samples also possess outstanding high-field piezoelectric strain effects. The high-field piezoelectric strain coefficient d(33)(*) is as high as 490 pm/V. (Li, Sb, Ta) modified (Na,K)NbO3 shifts the orthorhombic to tetragonal phase transition to near room temperature, which plays an important role in the improvement of the piezoelectric properties. (c) 2007 American Institute of Physics.
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页数:4
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