烧结方式对（K,Na,Li）（Nb,Sb,Ta）O3压电陶瓷的微观结构和物理性能的影响  

Influences of Sintering Methods on Microstructure and Physical Property of（K,Na,Li）（Nb,Sb,Ta）O3 Piezoelectric Ceramics

作　　者：张晓晨 王雪梅 王春雷[2] ZHANG Xiao-Chen;WANG Xue-Mei;WANG Chun-Lei(College of Physical Science and Technology,Sichuan University,Chengdu 610065,China;School of Physics,Shandong University,Jinan 250100,China)

机构地区：[1]四川大学物理科学与技术学院,成都610065 [2]山东大学物理学院,济南250100

出　　处：《无机材料学报》2019年第7期721-726,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(51672159)~~

摘　　要：(K,Na)NbO3基陶瓷(KNLNST陶瓷)是一类很有发展潜力的无铅压电材料,目前对其进行两步烧结相关的研究还很少。本工作分别采用普通烧结(Conventional Sintering,CS)和两步烧结(Two-step Sintering,TSS)制备了(K0.4425Na0.52Li0.0375)(Nb0.8825Sb0.08Ta0.0375)O3陶瓷,并进行微观结构与物性的对比研究。TSS可将(K,Na)NbO3基陶瓷的相对密度ρ'由CS时的95.0%提高至97.0%,压电系数d33由CS时的363 pC/N增大到387 pC/N。两种烧结方式制备的KNLNST陶瓷的微观组织结构和电畴结构有着很大的差异。KNLNST-CS陶瓷的晶粒尺寸较小而且分布较为均匀,极化后多数晶粒的电畴图案为简单的平行条纹。KNLNST-TSS陶瓷的晶粒尺寸则大小分布不均匀,极化后许多大晶粒中呈现带状条纹内部又存在着精细的平行条纹的电畴图案。(K,Na)NbO3-based ceramics (KNLNST ceramics) are a very promising type of lead-free piezoelectric materials.However,only limited studies were reported on them prepared by two-step sintering.Here,a comparison study was performed between two kinds of (K0.4425Na0.52Li0.0375)(Nb0.8825Sb0.08Ta0.0375)O3 ceramics that were prepared by either conventional sintering (CS) or two-step sintering (TSS).It was found that TSS largely increases the relative density r￠ and piezoelectric coefficient d33 from 95.0% and 363 pC/N of CS to 97.0% and 387 pC/N,respectively.KNLNST ceramics prepared by two kinds of sintering methods show significant differences between microstructure and domain structure.The KNLNST-CS ceramic has small grain sizes but distributed uniformly,and their domain patterns in most grains are simply a group or groups of parallel stripes.In contrast,the KNLNST-CS ceramic has a non-uniform grain-size distribution,with many large grains displaying broad bands,and existing fine strips.

关 键 词：(K Na)NbO3基陶瓷 两步烧结 压电性能 相变 微观组织结构 电畴结构 

分 类 号：TQ174[化学工程—陶瓷工业]