(Bi_(0.5)Na_(0.5))TiO_3-BaTiO_3系陶瓷的介电弛豫性能  

Dielectric relaxation properties of (Bi_(0.5)Na_(0.5))TiO_3-BaTiO_3 ferroelectric ceramics

作　　者：刘云飞[1] 施书哲[1] 许旱峤[1] 徐明[1] 卢都友[1] 吕忆农[1] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2005年第2期39-42,共4页Journal of Nanjing Tech University(Natural Science Edition)

摘　　要：采用传统压电陶瓷固相合成法制得了纯钙钛矿相的( 1 -x) (Bi0 5Na0 5 )TiO3 -xBaTiO3 (x=0 02, 0 04,0 06, 0 08, 0 10) (简写作BNBT)系无铅压电陶瓷。研究了1kHz条件下室温到400℃的温度范围内BNBT试样的介电温谱以及3种不同频率下(1、10、100kHz)BNBT-6试样的介电温谱,发现材料在研究组成范围内均为弛豫型铁电体。采用HRTEM研究了该系统的畴结构,表明BNBT钙钛矿结构铁电体的介电性能与复合离子的有序无序排列密切相关,纳米尺度有序微畴对介电弛豫起着重要作用。x)Bi_(0.5)Na_(0.5)TiO_3-xBaTiO_3(x=0.02, 0.04, 0.06, 0.08, 0.10)lead-free ceramics systems were prepared by conventional solid-state ceramic preparation method.The dielectric properties of BNBT samples from room temperature to 400 ℃ at 1 kHz, and the dielectric properties of BNBT-6 sample from room temperature to 400 ℃ at different frequencies(1 kHz, 10 kHz,100 kHz)were studied.It was found that in the compositions thus prepared are all ferroelectric relaxors.HRTEM results shows that the dielectric behavior of Bi_(0.5)Na_(0.5)TiO_3-BaTiO_3 ferroelectrics with A-based complex perovskite structure is closely related with the order-disorder arrangement of complex ions on A-sites.Nanoscale ordered domains play an important role on the relaxor behavior.

关 键 词：陶瓷工业 介电弛豫性能 分辨率 频率 结构分析 

分 类 号：TQ174[化学工程—陶瓷工业]