Phase transition behavior, dielectric and ferroelectric properties of (1-x)NaNbO3-xLiTaO3 ceramics
Phase transition behavior, dielectric and ferroelectric properties of (1-x)NaNbO3-xLiTaO3 ceramics
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(1-x)NaNbO3-xLiTaO3 陶瓷的相变行为、介电和铁电性能
DOI：
10.1016/j.jallcom.2021.160225
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发表时间：
2021-05
影响因子：
6.2
通讯作者：
Lei Zhang
中科院分区：
文献类型：
--
作者：
Min Chen;Yongping Pu;Lei Zhang
采用固相反应法合成了（1-x）NaNbO 3-xLiTaO 3陶瓷，研究了其相变、介电和铁电性能。XRD和拉曼分析结果表明，当x ≥ 0.10时，反铁电正交P相（Pbma）逐渐转变为铁电正交Q相（P21 ma），当x = 0.15时，出现了v1、v3和v6的转折点，这可能是两种O相随着x的增大而相互竞争的结果。LT的加入明显提高了NN陶瓷的扩散弛豫行为，x = 0.10的样品与x = 0.05的样品具有相当的Δ Tm。结果表明，x = 0.10的样品具有1.75ms的快铁电开关时间和27 μC/cm ~ 2的高介电常数，这是由于铁电相和弛豫扩散行为的增强。此外，x = 0.10的样品还显示出良好的矩形P-E回线，表明其在铁电存储器件中具有潜在的应用前景。
(1-x)NaNbO3-xLiTaO3ceramics were synthesized by solid state reactions and the phase transition, dielectric and ferroelectric properties were studied. XRD and Raman results suggested that the anti-ferroelectric orthorhombic P phase (Pbma) gradually transformed into the ferroelectric orthorhombic Q phase (P21ma) whenx≥ 0.10, and the turning points of v1, v3and v6appeared whenx= 0.15, which is probably due to the competition of two kinds of O phase with increasingx. The diffuse relaxor behavior of NN ceramics were obviously increased by LT addition, and thex= 0.10 sample possessed a comparable ΔTmwithx= 0.05 samples. As a result, thex= 0.10 sample possesses a fast ferroelectric switching time of 1.75 ms and a highProf 27 μC/cm2, due to the enhanced ferroelectric phase and relaxor diffuse behavior. In addition, thex= 0.10 sample also shows a well rectangular P-E loops, indicating its potential applications in ferroelectric memory devices.
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