钨青铜结构化合物(1–x)Ba_(2)NaNb_(5)O_(15)–xSr_(2)KNb_(5)O_(15)准同型相界的组成及其铁电性能  

Ferroelectric Properties of(1–x)Ba_(2Na) Nb_5O_(15)–xSr_2KNb_5O_(15) Tungsten Bronze Structural Compounds with Morphotropic Phase Boundary

作　　者：杨变 孙少东 吕洁丽 崔杰[1] YANG Bian;SUN Shaodong;LYU Jieli;CUI Jie(School of Materials Science and Engineering,Xi′an University of Technology,Xi′an 710048,China)

机构地区：[1]西安理工大学材料科学与工程学院,西安710048

出　　处：《硅酸盐学报》2023年第12期3046-3051,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金青年项目(52202298)。

摘　　要：与传统铁电材料相比,具有准同型相界(MPB)的铁电体具有增强的介电、压电和电光性能。通过传统固相烧结技术获得致密的(1–x)Ba_(2)Na Nb_(5)O_(15)–x Sr_(2)KNb_(5)O_(15 )(BNN–SKN)钨青铜结构陶瓷二元固溶体系,系统研究了BNN–SKN的结构、介电和铁电性能,探究迄今尚未确定的MPB区域。Ccm2与P4bm共存的MPB在x=0.7附近,随着SKN含量的增加,所测样品的相变温度及介电常数均在x=0.7附近取得极值,T_(m)=170.1℃,ε_(T R)=1 211,ε_(m)=3 326,给出了BNN–SKN体系的铁电性能,并讨论了该二元体系铁电性变化的影响因素。Ferroelectric materials with a morphotropic phase boundary (MPB) can exhibit enhanced dielectric,piezoelectric,and electrooptic properties,compared with conventional ferroelectric materials.In this paper,dense (1–x)Ba_(2Na) Nb_5O_(15)–x Sr_2KNb_5O_(15)(BNN-SKN) tungsten bronze structured ceramics of binary solid solution system were obtained by a solid-state sintering method.The microstructure and electric properties of BNN-SKN were investigated to explore the potential MPB regions.The MPB coexisting with Ccm2 and P4bm appears as x=0.7.As the SKN content increases,the phase transition temperature and dielectric constant of the measured samples reach their extreme values as x=0.7,i.e.,T_m=170,ε_(TR)=1 211,and ε_m=3 326.In addition,the ferroelectric properties of BNN-SKN system were also analyzed,and the factors affecting the ferroelectric change in this binary system were discussed.

关 键 词：钨青铜结构 准同型相界 铁电性 介电性能 

分 类 号：TM282[一般工业技术—材料科学与工程]