掺杂对LaCrO3的结构及中红外辐射性能的影响

doi:10.16085/j.issn.1000-6613.2016-1604

摘要/Abstract

摘要： 用高温固相反应法在1300℃下烧结2h制备出钙钛矿型La_0.8Ca_0.2Cr_0.5X_0.5O₃粉体材料，通过XRD、FTIR、XPS、IR-2对材料的物相结构和红外辐射性能进行表征。研究结果表明：对铬酸镧的A、B位分别掺杂Ca-Cr、Ca-Cu、Ca-Mn、Ca-Ni元素后，粉体试样在2.5~5μm波段的发射率均有大幅提升，原因归结于：掺杂后发生晶格畸变降低了晶体结构的对称性，偶极矩变化增大，促进晶格的振动吸收；同时在局部区域形成杂质能级，增加了晶体中自由载流子的浓度，提高短波段的发射率。发射率值由高到低的顺序为：Ca-Ni > Ca-Cr > Ca-Cu > Ca-Mn > 未掺，可能是由于掺杂元素材料本身带电粒子及运动特性存在差异所造成。掺杂Ca-Ni的粉体红外发射率高，达到0.89，可在高温陶瓷的辐射传热方面得以应用。

关键词: 钙钛矿, 复合材料, 粉体, 掺杂, 发射率, 纳米材料

Abstract: Perovskite type La_0.8Ca_0.2Cr_0.5X_0.5O₃ powders were prepared by high temperature solid state reaction at 1300℃ for 2 hours,and the phase structure and infrared radiation properties of the materials were characterized by means of XRD,FTIR,XPS and IR-2,respectively.The results show that the emissivity of the powder samples in the 2.5-5μm band is greatly improved after the addition of Ca-Cr,Ca-Cu,Ca-Mn and Ca-Ni elements to the A and B sites of lanthanum chromate.The reason is because the lattice distortion after doping reduces the symmetry of the crystal structure,increases the dipole moment and promotes the vibration absorption of the lattice.And the impurity energy level is formed in the local region of the crystal,which increases the concentration of free carriers in the crystal and improves the emissivity of the short band.The order of emission rate from high to low is:Ca-Ni > Ca-Cr > Ca-Cu > Ca-Mn > not doped.This phenomenon may be attributed to the difference in the charged particles and in the motion characteristics of the doped element material.The infrared emissivity of the powders doped with Ca-Ni is 0.89,which can be used in the radiation heat transfer of high temperature ceramics.

Key words: perovskite, composites, powders, doping, emission rate, nanomaterials

中图分类号:

TG148

刘庆生, 常晴, 李江霖. 掺杂对LaCrO₃的结构及中红外辐射性能的影响[J]. 化工进展, 2017, 36(07): 2547-2553.

LIU Qingsheng, CHANG Qing, LI Jianglin. Effect of doping on the structure of LaCrO₃ and the properties of mid infrared radiation[J]. Chemical Industry and Engineering Progress, 2017, 36(07): 2547-2553.

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掺杂对LaCrO₃的结构及中红外辐射性能的影响

Effect of doping on the structure of LaCrO₃ and the properties of mid infrared radiation

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