微波固相合成纳米LaB6的组织结构及其透光特性

来源期刊:中南大学学报(自然科学版)2011年第10期

论文作者:苏玉长 张鹏飞 肖立华 陈宏艳

文章页码:3015 - 3019

关键词:纳米LaB6;微波固相烧结;扫描电镜;Raman散射;透光特性

Key words:Nanoparticles LaB6; microwave solid-state sintering; scanning electronic microscope; Raman spectra; transmittance

摘    要:以La2O3和KBH4为原材料,用微波低温固相法合成LaB6纳米粉末。采用XRD衍射、Raman散射、扫描电镜和透射电镜对合成产物组织结构和分子振动进行表征。对添加LaB6纳米颗粒的聚乙烯醇缩丁醛(PVB)隔热透明涂层透光特性进行测试。研究结果表明:低温固相合成的LaB6结构与其他方法制备的LaB6结构相同,颗粒形状为类球形,其粒径在20~60 nm之间;含纳米LaB6颗粒的涂层对近红外辐射有明显的阻隔作用,在可见光区有良好的透过率;当添加纳米LaB6的质量分数为0.05%时,PVB涂层在可见过光区的透过率可达79%左右,在近红外光区的透过率只有46%。

Abstract:

Nanoparticles of lanthanum hexaboride(LaB6) were prepared by microwave radiated low-temperature solid-state reaction using La2O3 and KBH4 as starting materials. The microstructure and molecular vibration of LaB6 nanoparticles were characterized by XRD, Raman spectra, SEM and TEM. Samples with a LaB6 nanoparticle–doped polyvinyl butyral blends were tested for their performances in the reduction of solar heat gain. The results show that the structure of LaB6 synthesized by microwave radiated low-temperature solid-state reaction is consistent with LaB6 synthesized by other methods. The particles are spheres-like and the grain size is 20-60 nm. PVB sheet containing LaB6 nanoparticles can obviously block near infrared radiation and has good transmittance at visible light zone. When the mass ration of LaB6 and PVB is 0.05%, the transmittance is up to about 79% at visible light zone and only 46% at near infrared light zone.

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