Improved piezoelectric and strain performance of Na2B4O7-doped (Li,K,Na)NbO3 lead-free piezoceramics

文献类型： 外文期刊

第一作者： Zhao, Yongjie

作者： Zhao, Yongjie;Liu, Jialin;Yan, Dong

作者机构：

期刊名称：JOURNAL OF MATERIALS SCIENCE （ 影响因子：4.22； 五年影响因子：3.69 ）

ISSN： 0022-2461

年卷期： 2019 年 54 卷 2 期

页码：

收录情况： SCI

摘要： A polymorphic phase transition effect has been employed to regulate the piezoelectric property of lead-free (K,Na)NbO3-based materials, which intrinsically bear the disadvantage of the evident temperature sensitivity. In this research, Li-0.04[(K0.49Na0.51)](0.96)NbO3-xNa(2)B(4)O(7) piezoceramics were prepared through a conventional solid-state reaction. A piezoelectric coefficient d(33) of about 285pC/N and a unipolar strain of 0.14%@5kV/mm were achieved in the ceramics with x=0.5%. These improved properties can be ascribed to the coexistence of orthorhombic and tetragonal phase structure around room temperature. Besides, the field-induced unipolar strain varied less than 15% in the temperature region from room temperature to 180 degrees C. The stability of strain property could be rationally interpreted by a quantitative approach of electrostrictive coupling to the polarization amplitude.

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