K0.5Na0.5NbO3掺杂对0.94Bi0.5Na0.5TiO3-0.06BaTiO3陶瓷储能性能的影响

被引：1
|
作者：
苗健
邵辉
曹瑞龙
机构：
[1] 江苏科技大学材料科学与工程学院
来源：
人工晶体学报 | 2024年 / 53卷 / 05期
关键词：
BNT-BT陶瓷; KNN掺杂; 固相反应法; 弛豫; 铁电性能; 介电性能; 储能;
D O I：
10.16553/j.cnki.issn1000-985x.20240320.012
中图分类号：
TQ174.1 [基础理论];
学科分类号：
摘要：
采用传统固相反应法制备了K0.5Na0.5NbO3（KNN）掺杂的无铅介电储能陶瓷BNT-BT-KNN,其组分配比为0.94Bi0.5Na0.5TiO3-（0.06-x）BaTiO3-xK0.5Na0.5NbO3（BNT-BT+xKNN,x=0.00～0.04）,并研究了KNN掺杂对BNT-BT基陶瓷材料晶相、微观结构、介电、铁电性能及储能的影响。结果表明：在1 150℃温度下烧成后的陶瓷样品具有纯的钙钛矿结构，且样品的晶粒均匀致密；介电温谱显示，添加KNN后的BNT-BT铁电陶瓷在Tm处的介电峰进一步宽化，表现出更好的温度稳定性和弛豫性；同时随着KNN掺杂量的增加，样品的电滞曲线（P-E曲线）逐渐由“宽胖型”向“细长型”转变，样品的剩余极化强度（Pr）逐渐降低，从而进一步提高了BNT-BT陶瓷的储能性能。在2 kV/mm的场强下，x=0.03时测得样品的储能密度最佳Wrec=0.048 J/cm3,对应的储能效率η=43%,显示该材料在储能电容器上具有良好的应用潜力。
引用
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页码：882 / 888
页数：7
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