Piezoelectric properties of Li- and Ta-modified (K0.5Na0.5)NbO3 ceramics -: art. no. 182905
Piezoelectric properties of Li- and Ta-modified (K0.5Na0.5)NbO3 ceramics -: art. no. 182905
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DOI：
10.1063/1.2123387
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发表时间：
2005-10-31
影响因子：
4
通讯作者：
Setter, N
中科院分区：
文献类型：
--
作者：
Hollenstein, E;Davis, M;Setter, N
采用传统的固相烧结法制备了以锂（K0.5-x/2，Na0.5-x/2，Li-x）NbO3或锂钽（K0.5-x/2，Na0.5-x/2，Li-x）（Nb1-y，Ta-y）O3取代的无铅铌酸钾钠压电陶瓷。所选的组合物是最近报道的那些显示出高压电性能的组合物[Y.斋藤，H.高尾T.塔尼，T. Nonoyama，K. Takatori，T.霍马，T. Nagaya和M.中村，自然（伦敦）42，84（2004）; Y. Guo，K. Kakimoto和H. Ohsato，Appl. Phys. Lett. 85，4121（2004）; Mater. lett. 59，241（2005）]。我们表明，通过在空气中无压烧结，无需冷等静压，也无需任何烧结助剂或特殊粉末处理，所有成分都可以获得高密度和压电性能。共振和逆压电（应变场）测量显示，对于Li取代的陶瓷，厚度耦合系数k（t）为53%，逆压电系数d（33）约为200 pm/V，对于Li和Ta改性的样品，k（t）为52%，d（33）超过300 pm/V。单极应变场滞后是小的和可比的硬Pb（Zr，Ti）O-3在类似条件下测得的。压电性能的峰值可以注意到接近准同型相界。这些陶瓷看起来非常有希望作为可能的，实用的，无铅的替代锆钛酸铅。(C)2005年美国物理学会。
Lead-free, potassium sodium niobate piezoelectric ceramics substituted with lithium (K0.5-x/2,Na0.5-x/2,Li-x)NbO3 or lithium and tantalum (K0.5-x/2,Na0.5-x/2,Li-x)(Nb1-y,Ta-y)O-3 have been synthesized by traditional solid state sintering. The compositions chosen are among those recently reported to show high piezoelectric properties [Y. Saito, H. Takao, T. Tani, T. Nonoyama, K. Takatori, T. Homma, T. Nagaya, and M. Nakamura, Nature (London) 42, 84 (2004); Y. Guo, K. Kakimoto, and H. Ohsato, Appl. Phys. Lett. 85, 4121 (2004); Mater. Lett. 59, 241 (2005)]. We show that high densities and piezoelectric properties can be obtained for all compositions by pressureless sintering in air, without cold isostatic pressing, and without any sintering aid or special powder treatment. Resonance and converse piezoelectric (strain-field) measurements show a thickness coupling coefficient k(t) of 53% and converse piezoelectric coefficient d(33) around 200 pm/V for the Li-substituted ceramics, and a k(t) of 52% and d(33) over 300 pm/V for the Li- and Ta-modified samples. The unipolar strain-field hysteresis is small and comparable to that measured under similar conditions in hard Pb(Zr,Ti)O-3. A peak of piezoelectric properties can be noted close to the morphotropic phase boundary. These ceramics look very promising as possible, practicable, lead-free replacements for lead zirconate titanate.(C) 2005 American Institute of Physics.