电子元件与材料2018，Vol.37Issue(6)：6-12,7.DOI:10.14106/j.cnki.1001-2028.2018.06.002
Nb掺杂对BaTi0.98 Fe0.02O3陶瓷介电性能的影响
Effects of Nb doping on dielectric properties of BaTi0.98 Fe0.02O3 ceramics
摘要
Abstract
The BaTi0.98-xFe0.02NbxO3(0≤x≤0.08) ceramics were prepared by conventional solid state reaction processing. The crystal structure and dielectric properties of ceramic samples were studied by XRD, SEM, LCR analyzer. Defects configuration and defects energies were investigated by GULP software. The results indicate that ceramics transform from hexagonal to tetragonal barium titanate with Nb doping content increasing, meanwhile, the second phase ( Ba6 Ti17 O40 ) appears and tetragonality increases when x≤0.02. With the increase of Nb concentration, the dielectric peak temperature shifts to lower temperature, and the relaxation is observed when x≥0.04. The dielectric constant increases first when x≤0. 02, and then decreases when x≥0. 03. The main defects are barium vacancies, oxygen vacancies, and complex defects formed by substitutional isovalent ions in BaTi0. 98-x Fe0. 02 Nbx O3 ceram-ics by molecular dynamics defect simulation. With Nb doping content increasing, the concentration of defect dipoles, polar nanore-gions ( PNRs) , and relaxation degree increase.关键词
BaTiO3陶瓷/Nb掺杂/固相反应/介电性能/缺陷偶极子/弛豫铁电体Key words
BaTiO3 ceramics/Nb doping/solid state reaction/dielectric properties/defect dipoles/relaxor ferroelectric分类
信息技术与安全科学引用本文复制引用
李常昊,丁士华,张晓云,宋天秀,黄龙..Nb掺杂对BaTi0.98 Fe0.02O3陶瓷介电性能的影响[J].电子元件与材料,2018,37(6):6-12,7.基金项目
国家自然科学基金资助(11074203) （11074203）
