03 稀土掺杂无铅铁电陶瓷的电卡效应

赵俊;张鑫磊;杨俊林;李雍;郝喜红;

• 1:内蒙古科技大学材料与冶金学院

• 2:内蒙古科技大学工业技术研究院

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摘要(Abstract)：

以稀土Sm掺杂无铅0. 88(Na_(0. 5)Bi_(0. 5)) TiO_3-0. 12(Ba_(1-x)Sm_x) TiO_3(NBT-BST)铁电陶瓷为研究对象,研究Sm掺杂含量对陶瓷材料的相结构、微观结构及其铁电行为和相变过程的影响规律.利用麦克斯韦理论公式系统研究了不同Sm掺杂含量陶瓷的电卡性能.结果表明:在不同相变过程中,绝热温变、等温熵变及电卡系数均呈现出不同的变化规律,在Sm掺杂摩尔分数为0. 25%时实现了连续的电卡制冷行为,即正负电卡在30～180℃范围内共存.实现的连续电卡行为有益于提高电卡材料的工作效率,从而推动铁电陶瓷材料在可集成、高效率、高可靠性室温致冷领域的应用进程.

关键词(KeyWords)： 铁电陶瓷;电卡效应;稀土;极化

基金项目(Foundation): 国家自然科学基金资助项目(51702169)

作者(Author): 赵俊;张鑫磊;杨俊林;李雍;郝喜红;

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