Effects of quenching and annealing on conductivity and ferroelectric properties of Na0.5Bi0.5TiO3-NaNbO3 Ceramics
Effects of quenching and annealing on conductivity and ferroelectric properties of Na0.5Bi0.5TiO3-NaNbO3 Ceramics
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DOI：
10.1016/j.jeurceramsoc.2023.11.019
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发表时间：
2023-11
影响因子：
5.7
通讯作者：
Juncheng Pan;Yizhe Li;Ziqi Yang;David A. Hall
中科院分区：
文献类型：
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作者：
Juncheng Pan;Yizhe Li;Ziqi Yang;David A. Hall
淬冷工艺能有效提高钛酸铋钠弛豫铁电体的低退极化温度。在目前的工作中，热处理参数对NBT陶瓷的结构和电性能的影响进行了评估与5摩尔%的Na 2SO 4改性（NBT-5 NN）。结果表明，淬火导致更高的电导率，由于在高温下还原，导致在较高的氧空位浓度。淬火材料还表现出增强的菱面体畸变和铁电性能。还原过程在很大程度上是可逆的，通过在550 °C的区域中的中间温度下退火期间的再氧化，这有助于将体电阻率恢复到接近烧结材料的值。另一方面，菱面体畸变和铁电性能没有受到显着的退火过程中，这表明，负责修改的导电性和结构畸变/铁电性能的机制有不同的起源。
Quenching procedures are effective in enhancing the low depolarization temperature of sodium bismuth titanate (NBT) relaxor ferroelectrics. In the present work, the influence of thermal processing parameters on the structure and electrical properties of NBT ceramics modified with 5 mol% sodium niobate (NBT-5NN) are evaluated. It is shown that quenching leads to higher electrical conductivity due to reduction at high temperatures, resulting in a higher oxygen vacancy concentration. The quenched materials also exhibit enhanced rhombohedral distortion and ferroelectric properties. The reduction process is largely reversible by reoxidation during annealing at intermediate temperatures in the region of 550 °C, which helps to recover the bulk resistivity to values close to those of the as-sintered materials. On the other hand, the rhombohedral distortion and ferroelectric properties were not affected significantly by the annealing procedure, indicating that the mechanisms responsible for the modification of electrical conductivity and structural distortion/ferroelectric properties have a different origin.