文献类型：期刊文献

英文题名：The effect of grain boundary on the visible light absorption of BaTi1-x[Ni1/2Nb1/2](x)O3-delta ferroelectric ceramics

作者：Lou, Qiwei Zeng, Jiangtao Man, Zhenyong Zheng, Liaoying Park, Chulhong Kassiba, Abdelhadi Liu, Yun Chen, Xiaoming Li, Guorong

第一作者：Lou, Qiwei

通信作者：Li, GR[1]

机构：[1]Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Inorgan Funct Mat & Devices, 1295 Dingxi Rd, Shanghai 200050, Peoples R China;[2]Univ Chinese Acad Sci, Beijing, Peoples R China;[3]Pusan Natl Univ, Dept Phys Educ, Pusan, South Korea;[4]Le Mans Univ, CNRS, Inst Mol & Mat, UMR6283, Le Mans, France;[5]Australian Natl Univ, Res Sch Chem, Canberra, ACT, Australia;[6]Guizhou Inst Technol, Sch Mat & Met Engn, Guiyang, Guizhou, Peoples R China

第一机构：Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Inorgan Funct Mat & Devices, 1295 Dingxi Rd, Shanghai 200050, Peoples R China

通信机构：corresponding author), Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Inorgan Funct Mat & Devices, 1295 Dingxi Rd, Shanghai 200050, Peoples R China.

年份：2019

卷号：102

期号：12

起止页码：7405-7413

外文期刊名：JOURNAL OF THE AMERICAN CERAMIC SOCIETY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000488744700035)】；

语种：英文

外文关键词：absorption; defects; ferroelectric materials

摘要：(Ni2+, Nb5+) co-doped BaTiO3 ceramics BaTi1-x(Ni1/2Nb1/2)(x)O3-delta (BTNN-100x) are prepared by a solid-state reaction method, and their electrical and light absorption properties are investigated. The results show that BTNN-100x can generate oxygen vacancies which pin the domain walls. BTNN-100x bulk ceramics show strong visible light absorption. However, the phenomenon of visible light absorption disappear for BTNN-100x ceramic powders, and the band gap of doped ceramic powders are nearly unchanged. The experiments demonstrate that stress and density have little effect on the band gap. And the grain boundary shows stronger cathodoluminescence (CL) emission. Actually, oxygen vacancies can be enriched at grain boundaries, and defect [V-o-Ni-Ti-V-o] complex structures can be form and give rise to the visible light absorption as demonstrated by First-principles calculations. Thus, the engineering design of ferroelectric grain boundaries may pave the way for the application of coupled ferroelectric-photovoltaic processes.