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发明公开
CN107010947A 具有临界突变开关效应的无铅铁电陶瓷材料及其制备方法 失效 - 权利终止

具有临界突变开关效应的无铅铁电陶瓷材料及其制备方法
摘要：
本发明公开了一种具有临界突变开关效应的无铅铁电陶瓷材料及其制备方法，材料配方为：Bi1/2Na1/2Ti0.85(Li1/4Nb3/4)0.05(Zr1/2Zn1/2)0.10O3；通过B位与Ti4+离子相同化合价的复合离子(Li1/4Nb3/4)4+，以及不同化合价复合离子(Zr1/2Zn1/2)3+，严格以1:2的比例，在B位取代Ti4+离子，产生不同带电缺陷类型，形成相邻晶胞缺陷有序排列，产生电子和空穴补偿型的带电电畴(非空位或者离子补偿效应)，因而出现特殊的临界开关效应的电场诱导巨应变行为。制得产品经实验测量具有电场诱导的巨应变性能，应变量可达S%=0.47%，同时具有在临界开关电场EC=56kV/cm巨应变发生，并且在很窄的电场范围内ΔE=2kV/cm发生完全应变，在临界区域，应变变化率α可达2.8×103。这些性能目前还未见报道，可以在特殊的场合应用。
摘要（英）：

The invention discloses a lead-free ferroelectric ceramic material with critical sudden change switch effect and a preparation method thereof; the formula of the lead-free ferroelectric ceramic material is Bi1/2Na1/2Ti0.8(Li1/4Nb3/4)0.05(Zr1/2Zn1/2)0.10O3; a strict ratio of 1:2 is achieved for composite ions (Li1/4Nb3/4)<4+> having B site valently equal to Ti<4+> ions and composite ions (Zr1/2Zn1/2)<3+> having different valences, Ti<4+> ions are replaced at the B site, different types of charged defects are generated, adjacent unit cell defects are arranged in order, electronic and hole compensated charged electric domain (non-vacant or ionic compensation effect) is generated, and special electric-field-induced great strain behavior of critical switch effect occurs. The produced material is experimentally measured to have great electric-field-induced strain performance, strain capacity may reach S%=0.47%, and the produced material also has great strain in critical switch electric field delta E=56kV/cm, complete strain occurs in the very narrow electric field range delta E=2kV/cm, and the strain variation rate may reach 2.8*10<3> in the critical area. These properties are not reported yet at present, and the material and the preparation method thereof are suitable for special applications.

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