Origin of high mechanical quality factor in CuO-doped (K, Na)NbO3-based ceramics
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- 作者：Wen-Feng Liang (1) (2) (3)
Ding-Quan Xiao (1)
Jia-Gang Wu (1)
Wen-Juan Wu (1)
Jian-Guo Zhu (1) - 关键词：lead ; free piezoelectric ceramic ; (K ; Na)NbO3 (KNN) ; mechanism of hardening effect ; mechanical quality factor Q m ; domain stabilization
- 刊名：Frontiers of Materials Science
- 出版年：2014
- 出版时间：June 2014
- 年：2014
- 卷：8
- 期：2
- 页码：165-175
- 全文大小：
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Ding-Quan Xiao (1)
Jia-Gang Wu (1)
Wen-Juan Wu (1)
Jian-Guo Zhu (1)
1. Department of Materials Science, Sichuan University, Chengdu, 610064, China
2. CAEP Key Laboratory of Neutron Physics, Mianyang, 621900, China
3. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621900, China - ISSN：2095-0268
文摘
The origin of a high mechanical quality in CuO-doped (K, Na)NbO3-based ceramics is addressed by considering the correlations between the lattice positions of Cu ions and the hardening effect in K0.48Na0.52 + xNbO3-0.01CuO ceramics. The Cu ions simultaneously occupy K/Na and Nb sites of these ceramics with x = 0 and 0.02, only occupy the K/Na site of the ceramics with x = ?.02, and mostly form a secondary phase of the ceramics with x = ?.05. The Cu ions lead to the hardening of ceramics with an increase of E C and Q m by only occupying the K/Na site, together with the formation of double hysteresis loops in un-poled compositions. A defect model is proposed to illuminate the origin of a high Q m value, that is, the domain stabilization is dominated by the content of relatively mobile O2?/sup> ions in the ceramics, which has a weak bonding with CuK/Na defects.