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- Title
Microstructure and piezoelectric properties of HoO doped (KNa)LiNbSbO lead-free ceramics near the rhombohedral-orthorhombic phase boundary.
- Authors
Du, Juan; Liu, Jialiang; Xu, Zhijun; Chu, Ruiqing; Yi, Xiujie; Hao, Jigong; Li, Wei
- Abstract
HoO doped (KNa)LiNbSbO (KNLNS) lead-free piezoelectric ceramics were prepared by normal sintering to construct rhombohedral-orthorhombic polymorphic phase boundary. An orthorhombic and rhombohedral phase boundary is formed in the ceramics around x = 0.6-0.8, indicating that the doping of HoO is helpful to stabilize the low temperature rhombohedral structure. The surface and interior of the x ≤ 0.6 samples exhibit tetragonal and orthorhombic structures, respectively, which demonstrate that phase transitions can be induced by the alkali metal oxides volatilization during sintering. Anomalous broad dielectric relaxation is observed in the ε- T curves near T when x ≥ 0.8. Abnormal grain growth occurs when small amount of HoO is added but the grain size decreases at high amount of HoO. The optimum electrical properties of d = 252 pC/N, k = 39.67 %, ε = 930.4, and Q = 59.5 are obtained at x = 0.6. These results show that the KNLNS ceramic with 0.6 wt% HoO is a promising lead-free piezoelectric material.
- Subjects
HEMATITE; MICROSTRUCTURE; HOLMIUM oxides; LEAD-free ceramics; PIEZOELECTRIC materials; ORTHORHOMBIC crystal system
- Publication
Journal of Materials Science: Materials in Electronics, 2015, Vol 26, Issue 12, p9654
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-015-3632-9