High, purely electrostrictive effect in cubic K_0.95Na_0.05Ta_1 ?#xa0;xNb_xO₃ lead-free single crystals

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• 作者：Hao Tian ; ^{tianhao@hit.edu.cn} ; Chengpeng Hu ; Qizhen Chen ; Zhongxiang Zhou
• 关键词：Lead-free single crystal ; Potassium sodium tantalite niobate ; Electrostrictive ; Phase transformation ; Ferroelectrics
• 刊名：Materials Letters
• 出版年：2012
• 出版时间：1 February 2012
• 年：2012
• 卷：68
• 期：Complete
• 页码：14-16
• 全文大小：489 K

文摘

Large electrostrictive effect has been observed in K_0.95Na_0.05Ta_1 ?#xA0;xNb_xO₃ (x = 0.42, 0.43) lead-free single crystals. Cubic crystals have been grown by the top seed solution growth method. Both crystals undergo phase transition from tetragonal phase to cubic phase near room temperature. Large dielectric constant, field-induced phase transition and slimmer P-E loop produce high, purely electrostrictive effect in the crystals. The electrostrictive coefficient Q₁₁, Q₁₂, M₁₁ and M₁₂ of K_0.95Na_0.05Ta_0.57Nb_0.43O₃ crystal reaches as high as 0.38 m⁴ C^?, ^{?/sup>0.10 m4 C?, 17.6 ¡Á 10?6 m2 V? and ?.46 ¡Á 10?6 m2 V?, respectively. The Q₁₁ value of the crystal is 15 times larger than that of high performance Pb-based Pb(Mn_1/3Nb_2/3)O₃ ceramics.}