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Structural phase transition, optical and pyroelectric properties of lead-free single crystals

查看全文 作　　者：FANG [1]BiJun;WANG [1]Meng;YUAN [1]NingYi;DING [1,2]JianNing;ZHAO [3]XiangYong;XU [3]HaiQing;LUO [3]HaoSu 高影响力作者 机构地区：[1]School of Materials Science and Engineering,Changzhou University;[2]School of Materials Science and Engineering,Jiangsu University;[3]Key Laboratory of Inorganic Function Material and Device,Chinese Academy of Sciences高影响力机构 出　　处：《Chinese Science Bulletin》索引2013年第58卷第33期,共8页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(51242006);the Qing Lan Project,the Key Laboratory of Inorganic Function Material and Device,Chinese Academy of Sciences(KLIFMD-2011-02);the Priority Academic Program Development of Jiangsu Higher Education Institutions 摘　　要：0.14 at%Mn-doped 0.95(Na1/2Bi1/2)TiO3-0.05BaTiO3(0.95NBT-0.05BT)lead-free single crystals were grown by a top-seeded solution growth method(TSSG).X-ray powder diffraction measurement showed that the as-grown single crystals exhibit rhombohedral perovskite structure with apparent distortion.With the increase of temperature,successive structural phase transitions occur in the Mn-doped 0.95NBT-0.05BT single crystals.After poling,apparent dielectric anomaly is induced accompanied by the increase of the character of diffuse phase transition and the decrease of the value of dielectric constant.The Mn-doped0.95NBT-0.05BT single crystals exhibit complex domain structure,in which micro and macro domains coexist with statistically 4mm symmetry.The Mn-doped 0.95NBT-0.05BT lead-free single crystals exhibit excellent piezoelectric and pyroelectric properties,which will lead to promising advance in piezoelectric and pyroelectric applications.The infrared-absorption band occurred around 630.6 cm 1can be assigned to the'stretching'normal vibration of[Na1/2Bi1/2]/Ti-O group.The three diffused Raman bands centered around 300,560 and 800 cm 1can be attributed to F2g[TiO6]bending vibration,A1g[TiO6]stretching vibration and'soft mode'mixed by bending and stretching vibrations. 关 键 词：结构相变 热释电性能 单晶 无铅 X-射线粉末衍射 溶液生长法 MN掺杂 弯曲振动
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