Evolving antiferroelectric stability and phase transition behavior in NaNbO3-BaZrO3-CaZrO3 lead-free ceramics
Evolving antiferroelectric stability and phase transition behavior in NaNbO3-BaZrO3-CaZrO3 lead-free ceramics
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DOI：
10.1016/j.jeurceramsoc.2019.02.029
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发表时间：
2019-07
影响因子：
5.7
通讯作者：
H. Qi;R. Zuo
中科院分区：
文献类型：
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作者：
H. Qi;R. Zuo
研究发现，NaNbO3陶瓷中反铁电性的稳定性随着xmol% CaZrO3和6 mol% BaZrO3的共掺杂而演变，由于Ba和Ca离子的离子半径不同，从占主导地位的铁电（FE）正交Q相（x= 0）演变为逐渐稳定的反铁电（AFE）正交P相。虽然在x= 0.5时出现完整的AFE P相，但场致AFE-FE相变首先是不可逆的，然后在x= 1时变为部分可逆，最后在x= 3时完全可逆。通过介电、极化和应变特性以及原位/异位同步加速器X射线衍射和表征，上述变化过程被证明与x反铁电稳定性的增强有关。拉曼光谱。基于相结构变化构建了基于NN的无铅AFE陶瓷的成分场相图，这将有助于清楚地了解离子掺杂如何影响其反铁电性。
The stability of antiferroelectricity in NaNbO3ceramics was found to evolve with co-dopingxmol% CaZrO3and 6 mol% BaZrO3, from a dominant ferroelectric (FE) orthorhombic Q phase (x= 0) to a gradually stabilized antiferroelectric (AFE) orthorhombic P phase owing to different ionic radii of Ba and Ca ions. Although a complete AFE P phase appears atx= 0.5, the field induced AFE-FE phase transformation is irreversible at first, and then becomes partially reversible atx= 1 and finally completely reversible atx= 3. The above-mentioned change process proves to be associated with the enhancing stability of antiferroelectricity withx, as evidenced by means of dielectric, polarization and strain properties as well as in/ex-situ synchrotron x-ray diffraction and Raman spectra. A composition-field phase diagram for the NN-based lead-free AFE ceramic was constructed on basis of the phase structural change, which would provide a clear understanding of how ion doping influences its antiferroelectricity.