A Mössbauer study of amorphous Fe40Ni40B20期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

A Mössbauer study of amorphous Fe₄₀Ni₄₀B₂₀

Authors:	Anil K. Bhatnagar B. Bhanu Prasad N. Ravi R. Jagannathan T.R. Anantharaman

Affiliation:	School of Physics, University of Hydrabad, Hyderabad 500134, India;School of Chemistry, University of Hyderabad, Hyderabad 500134, India;Institute of Technology, Banaras Hindu University, Varanasi 221005, India

Abstract:	Amorphous Fe₄₀Ni₄₀B₂₀ (VITROVAC 0040) alloy has been investigated using ⁵⁷Fe Mössbauer Spectroscopy. The Curie temperature T_c is found to be well defined and is 695 ± 1 K. The quadrupole splitting just above T_c is 0.64 mm sec^?1. The crystallization temperature is 698 ± 2 K, close to but definitely above T_c. The average hyperfine field H_eff(T) of the glassy state shows a temperature dependence of $H_{eff} (0)[1 ? B_{32} (T/T_{c})^{32} ? C_{52} (T/T_{c})^{52} ? …]$ indicative of the existence of spin wave excitations. The values of $B_{32}$ and $C_{52}$ are found to be 0.40 and 0.06, respectively, for T/T_c ? 0.72. At temperatures close to T_c, H_eff(T) varies as (1 ? T/T_c)^β where β is one of the critical exponents and its value is found to be 0.29 ± 0.02.

Keywords:
本文献已被 ScienceDirect 等数据库收录！