高等学校化学学报2001，Vol.22Issue(3)：349-354,6.
EXAFS研究Ni-B和Ni-Ce-B 超细非晶态合金的退火晶化
Annealed Crystallization of Ni-B and Ni-Ce-B Ultrafine Amorphous Alloys Studied by EXAFS
摘要
Abstract
EXAFS technique was used to quantitatively determine the local structure evolutions of Ni-B and Ni-Ce-B ultrafine amorphous alloys prepared by chemical reduction during the annealed process. The results show that the average bond length Rj, coordination number N, thermal disorder factor σT and static disorder factor σS are 0.275 nm, 11.9, 0.006 9 nm, 0.034 nm; 0.215 nm， 2.7， 0.005 5 nm， 0.003 8 nm, and 0.276 nm, 12.4, 0.006 7 nm, 0.035 nm; 0.214 nm， 2.9， 0.005 8 nm， 0.004 2 nm for the Ni-Ni and Ni-B first neighbor shells of Ni-B and Ni-Ce-B ultrafine amorphous alloys, respectively. It is indicated that the σS of Ni-Ni shell is rather larger, about four or five times as large as that of σT, and one order larger than that of σS of Ni-B shell. Ni-B sample is crystallized after being annealed at 300 ℃, and its RNi—Ni as well as σS are 0.254 nm and 0.011 nm, respectively. However, the crystallization temperature of Ni-Ce-B sample increases about 100 ℃ due to the addition of 0.3% Ce element. The local structure around Ni atom for the Ni-B sample annealed at 500 ℃ is fully similar to that of Ni foil. For the Ni-Ce-B samples annealed at 500 ℃, the σS of Ni-Ni shell is 0.007 3 nm and the N of Ni-B shell is 1.2. It implies that the Ni lattice produced from the crystallization of Ni-Ce-B amorphous alloys is significantly distorted and the interaction between Ni and B atoms is strongly increased by the effect of Ce element.关键词
EXAFS/Ni-B/Ni-Ce-B/超细非晶态合金分类
数理科学引用本文复制引用
王晓光,闫文胜,钟文杰,张新夷,韦世强..EXAFS研究Ni-B和Ni-Ce-B 超细非晶态合金的退火晶化 [J].高等学校化学学报,2001,22(3):349-354,6.基金项目
国家自然科学基金 （）
