Microstructure and piezoelectric properties of Ho2O3 doped (K0.4Na0.6)0.95Li0.05Nb0.95Sb0.05O3 lead-free ceramics near the rhombohedral-orthorhombic phase boundary

被引:2
作者
Du, Juan [1 ]
Liu, Jialiang [1 ]
Xu, Zhijun [1 ]
Chu, Ruiqing [1 ]
Yi, Xiujie [1 ]
Hao, Jigong [1 ]
Li, Wei [1 ]
机构
[1] Liaocheng Univ, Sch Mat Sci & Engn, Liaocheng 252059, Peoples R China
基金
中国国家自然科学基金; 国家高技术研究发展计划(863计划);
关键词
SODIUM-POTASSIUM NIOBATE; (K0.5NA0.5)NBO3 CERAMICS; TRANSITION; TEMPERATURE;
D O I
10.1007/s10854-015-3632-9
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Ho2O3 doped (K0.4Na0.6)(0.95)Li0.05Nb0.95Sb0.05O3 (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 Ho2O3 is helpful to stabilize the low temperature rhombohedral structure. The surface and interior of the x a parts per thousand currency sign 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 epsilon (r)-T curves near T (C) when x a parts per thousand yen 0.8. Abnormal grain growth occurs when small amount of Ho2O3 is added but the grain size decreases at high amount of Ho2O3. The optimum electrical properties of d (33) = 252 pC/N, k (p) = 39.67 %, epsilon (r) = 930.4, and Q (m) = 59.5 are obtained at x = 0.6. These results show that the KNLNS ceramic with 0.6 wt% Ho2O3 is a promising lead-free piezoelectric material.
引用
收藏
页码:9654 / 9660
页数:7
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