Good temperature stability and high piezoelectric properties of pure and La-doped tetragonal (K0.45Na0.55)0.94Li0.06·TaxNb1−xO3 ceramics
Good temperature stability and high piezoelectric properties of pure and La-doped tetragonal (K0.45Na0.55)0.94Li0.06·TaxNb1−xO3 ceramics
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DOI：
10.1016/j.jeurceramsoc.2014.06.033
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发表时间：
2014-12
影响因子：
5.7
通讯作者：
Huan-Huan Li-Huan;Qingxin Meng;D. Gong;H. Tian;Zhongxiang Zhou
中科院分区：
文献类型：
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作者：
Huan-Huan Li-Huan;Qingxin Meng;D. Gong;H. Tian;Zhongxiang Zhou
采用常规烧结法制备了纯镧掺杂四方（K 0.45 Na 0.55） 0.94 Li 0.06·Ta x Nb 1−x O 3无铅陶瓷。研究了这些陶瓷的压电性能和温度依赖性。四方相（K 0.45 Na 0.55） 0.94 Li 0.06·Ta x Nb 1−x O 3陶瓷具有良好的温度稳定性和较高的压电性能。采用La来降低PPT的影响，进一步提高（K 0.45 Na 0.55） 0.94 Li 0.06·Ta 0.35 Nb 0.65 O 3陶瓷的温度稳定性。0.5 mol% la掺杂（K 0.45 Na 0.55） 0.94 Li 0.06·Ta 0.35 Nb 0.65 O 3陶瓷表现出最佳性能（高压电性能：d33 = 152 pC/N, K p= 30.5%，良好的温度依赖性：在20 - 80℃范围内，Δ f r/f r 20℃max= 0.79%， Δ K p/ K p 20℃max= 2.11%）。
Pure and La-doped tetragonal (K 0.45 Na 0.55) 0.94 Li 0.06· Ta x Nb 1− x O 3 lead-free ceramics were prepared by the conventional sintering method. The piezoelectric properties and the temperature dependence of these ceramics were investigated. Both good temperature stability and high piezoelectric properties were obtained in tetragonal-phase (K 0.45 Na 0.55) 0.94 Li 0.06· Ta x Nb 1− x O 3 ceramics. La was employed to reduce the effect of PPT and further improve the temperature stability of (K 0.45 Na 0.55) 0.94 Li 0.06· Ta 0.35 Nb 0.65 O 3 ceramics. 0.5 mol% La-doped (K 0.45 Na 0.55) 0.94 Li 0.06· Ta 0.35 Nb 0.65 O 3 ceramics show the optimum properties (high piezoelectric properties: d 33= 152 pC/N and k p= 30.5% and good temperature dependence: Δ f r/f r 20° C max= 0.79% and Δ k p/k p 20° C max= 2.11% in the temperature region 20–80° C).