Bi-fluctuation in Na0.5Bi0.5TiO3 ferroelectric ceramics with abnormal relaxor behaviour

被引：3

作者：

Luo, Huijiadai ^{[1
,2
]}

Ke, Hua ^{[1
,2
]}

Zhang, Hongjun ^{[1
,2
]}

Zhang, Liwei ^{[1
,2
]}

Li, Fangzhe ^{[1
,2
]}

Cao, Lu ^{[1
,2
]}

Guo, Pengkang ^{[1
,2
]}

Jia, Dechang ^{[1
,2
]}

Zhou, Yu ^{[1
,2
]}

机构：

[1] Harbin Inst Technol, Inst Adv Ceram, Sch Mat Sci & Engn, Harbin 150080, Heilongjiang, Peoples R China

[2] Harbin Inst Technol, Key Lab Adv Struct Funct Integrat Mat & Green Mfg, Harbin 150080, Heilongjiang, Peoples R China

来源：

PHILOSOPHICAL MAGAZINE | 2019年 / 99卷 / 21期

基金：

中国国家自然科学基金;

关键词：

PHASE-TRANSITIONS; PEROVSKITE; RAMAN; TEM; SPECTROSCOPY; ORDER;

D O I：

10.1080/14786435.2019.1637550

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The existence of Bi-fluctuation dispersing in Na0.5Bi0.5TiO3 (NBT) relaxor ferroelectric is hinted in other recent studies. However, this fluctuation has not been directly observed yet. We introduce the Bi-rich nano-regions with different sizes in a series of NBT ceramics by the slight excess of Bi3+ content. The crystal symmetries of the Bi-rich nano-regions and the NBT matrix are rhombohedral. The lattice parameters of the nano-regions are larger than those of the matrix in NBT ceramics, which were confirmed by the X-ray diffraction Rietveld refinement, TEM techniques and first-principles calculation. Also, the disorder-induced nano-regions appearing as Bi-fluctuation are associated with the complex phase transitions and the high-frequency relaxor behaviour of NBT suggested by the dielectric measurements and Raman spectra.

引用

页码：2661 / 2680

页数：20

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