超导纳米晶氮化铌的合成与表征

Synthesis and characterization of superconducting nanocrystalline niobium nitride.

作者信息

Shi Liang, Gu Yunle, Chen Luyang, Yang Zeheng, Ma Jianhua, Qian Yitai

机构信息

Structure Research Laboratory and Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China.

出版信息

J Nanosci Nanotechnol. 2005 Feb;5(2):296-9. doi: 10.1166/jnn.2005.040.

DOI:10.1166/jnn.2005.040

PMID:15853151

Abstract

Nanocrystalline niobium nitride (NbN0.9) was successfully synthesized at 600 degrees C through a solid-state reaction. The synthesis was carried out in an autoclave by using NbCl5 and NaN3 as the reactants. The X-ray powder diffraction pattern indicates the formation of cubic NbN0.9. Transmission electron microscopy images show that typical NbN0.9 crystallites are composed of uniform particles with an average size of about 30 nm and nanorod crystallites with a typical size of about 40 x 2500 nm. Magnetic measurements exhibited that a superconducting transition occurred at 15.4 K for the NbN0.9 product.

摘要

通过固态反应在600摄氏度成功合成了纳米晶氮化铌（NbN0.9）。合成过程在高压釜中进行，使用NbCl5和NaN3作为反应物。X射线粉末衍射图谱表明形成了立方相的NbN0.9。透射电子显微镜图像显示，典型的NbN0.9微晶由平均尺寸约为30 nm的均匀颗粒和典型尺寸约为40×2500 nm的纳米棒微晶组成。磁性测量表明，NbN0.9产物在15.4 K发生超导转变。