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
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- 英文论文题名：Electrospinning Preparation and Infrared-emissivity Properties of La_(0.67)Ba_(0.33)MnO_3 Nanofibers
- 论文作者：刘嘉玮 ; 王建江 ; 赵芳 ; 许宝才
- 英文论文作者：Jiawei Liu ; Jianjiang Wang ; Fang Zhao ; Baocai Xu ; Ordnance Engineering College ; Advanced Material Institute
- 年：2016
- 作者机构：军械工程学院先进材料研究所;
- 论文关键词：La0.67Ba0.33MnO3 ; 热处理温度 ; 形貌结构 ; 红外发射率
- 英文论文关键词：La0.67Ba0.33Mn O3 ; calcination temperatures ; micromorphology ; infrared-emissivity
- 会议召开时间：2016-11-18
- 会议录名称：中国第四届静电纺丝大会（CICE 2016）摘要集
- 语种：中文
- 分类号：TQ340.64
- 学会代码：ZGNM
- 会议名称：中国第四届静电纺丝大会(CICE 2016)
- 会议地点：中国北京
- 主办单位：中国复合材料学会超细纤维材料分会（筹）
- 学会名称：中关村科创纳米技术创新研究会
- 页数：1
- 文件大小：599k
- 原文格式：D
- 会议级别：全国
摘要
本文采用静电纺丝技术结合溶胶-凝胶法制备了钙钛矿型La_(0.67)Ba_(0.33)MnO_3微纳米纤维。并利用XRD、TGA-DSC、FT-IR和SEM等方法对产物进行了表征。研究了热处理温度对煅烧后产物的物相、微观形貌的影响。利用IR-2红外发射率测试仪研究了La_(0.67)Ba_(0.33)MnO_3在270K~370K温度范围内的红外发射率。研究表明:La_(0.67)Ba_(0.33)MnO_3在600℃时钙钛矿结构形成;随着煅烧温度的升高,La_(0.67)Ba_(0.33)MnO_3的形貌由微纳米纤维状向三维网络状转变,并最终失去纤维形态(见图一);在270K~370K温度范围内,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,样品发射率变化在0.12左右(见图二)。利用钙钛矿材料金属-绝缘体相变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 La_(0.67)Ba_(0.33)MnO_3 nanofibers are successfully fabricated by electrospinning combined with sol-gel technology.The as-prepared nanofibers are characterized by XRD,TGA,FTIR and SEM;The influences of the calcination temperatures on the crystal structure, micromorphology of the calcined products has been discussed. Infrared emissivity of La_(0.67)Ba_(0.33)MnO_3 in 280K-370 K temperature range was tested by IR-2 infrared-emissivity analyzer. The experimental results show that perovskite structure is basically formed after calcination at 600 ℃;With the increase of calcination temperature, the sample's morphology changed fiber toward three-dimensional network structure, and eventually lost the fiber morphology;The infrared emissivity of La_(0.67)Ba_(0.33)MnO_3 fiber at 600℃ increases with the increase of temperature, which is increased from 0.564 to 0.689, and the variable range is 0.12 between 280 K and 370 K. This phenomenon is explained by the theory of metal-insulator phase transition.The application prospect of La_(0.67)Ba_(0.33)MnO_3 in variable infrared-emissivity material is discussed.
Perovskite-type La_(0.67)Ba_(0.33)MnO_3 nanofibers are successfully fabricated by electrospinning combined with sol-gel technology.The as-prepared nanofibers are characterized by XRD,TGA,FTIR and SEM;The influences of the calcination temperatures on the crystal structure, micromorphology of the calcined products has been discussed. Infrared emissivity of La_(0.67)Ba_(0.33)MnO_3 in 280K-370 K temperature range was tested by IR-2 infrared-emissivity analyzer. The experimental results show that perovskite structure is basically formed after calcination at 600 ℃;With the increase of calcination temperature, the sample's morphology changed fiber toward three-dimensional network structure, and eventually lost the fiber morphology;The infrared emissivity of La_(0.67)Ba_(0.33)MnO_3 fiber at 600℃ increases with the increase of temperature, which is increased from 0.564 to 0.689, and the variable range is 0.12 between 280 K and 370 K. This phenomenon is explained by the theory of metal-insulator phase transition.The application prospect of La_(0.67)Ba_(0.33)MnO_3 in variable infrared-emissivity material is discussed.
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