静电纺丝法制备La_(0.67)Ba_(0.33)MnO_3微纳米纤维及其红外发射率研究（英文）  

Electrospinning Preparation and Infrared-emissivity Properties of La_(0.67)Ba_(0.33)MnO_3 Micro/nanofibers

作　　者：刘嘉玮[1] 王建江[1] 赵芳[1] 许宝才[1] 

机构地区：[1]军械工程学院先进材料研究所,石家庄050003

出　　处：《高等学校化学学报》2017年第6期929-934,共6页Chemical Journal of Chinese Universities

基　　金：supported by the Natural Science Foundation of Hebei Province,China(No.E2015506011)~~

摘　　要：采用静电纺丝法结合溶胶-凝胶技术制备了钙钛矿型La_(0.67)Ba_(0.33)MnO_3微纳米纤维,并利用差示扫描量热-热失重分析(DSC-TGA)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)和扫描电子显微镜(SEM)等技术对产物进行了表征,利用IR-2红外发射率测试仪测试了La_(0.67)Ba_(0.33)MnO_3在280~370 K范围内的红外发射率.结果表明,La_(0.67)Ba_(0.33)MnO_3在600℃时已形成钙钛矿结构.随着煅烧温度的升高,La_(0.67)Ba_(0.33)MnO_3的形貌由纤维状向三维网络状转变,并最终失去纤维形态.在280~370 K范围内,La_(0.67)Ba_(0.33)MnO_3微纳米纤维的红外发射率随温度升高而升高,由0.564增加至0.689.利用钙钛矿材料双交换理论解释了这一现象,并进一步探讨了其在红外发射率可变材料中的应用前景.Perovskite-type La0.67Ba0.33MnO3 micro/nanofibers were fabricated through electrospinning technology. The fibers were characterized by means of differential scanning calorimetry-thermogravimetric analysis （ DSC-TGA）, X-ray diffraction （ XRD）, Fourier transform infrared spectroscopy （FFIR） and scanning electron microscopy （SEM）. The infrared emissivity of the fibers in the temperature range of 280-370 K was tested by IR-2 infrared-emissivity analyzer. The results show that perovskite structure is formed at 600 ℃. As the temperature increases, the morphology of samples changes from fiber to three-dimensional network structure, and eventually loses the fiber morphology. The infrared emissivity of La0.67Ba0.33MnO3 fibers calcined at 600 ℃ rises from 0. 564 to 0. 689 with the increase of temperature, which can be explained by the theory of double-exchange. The prospect of La0.67Ba0.33MnO3 fibers in variable infrared-emissivity materials is promising in the future.

关 键 词：La0.67Ba0.33MnO3 微纳米纤维 形貌 红外发射率 

分 类 号：O614[理学—无机化学]