Structure, superconductivity and magnetic properties of mechanically alloyed Mg1-xFexB2 powders with x=0-0.4

被引：11
作者：
Gao, YD
Ding, J
Chen, Q
Rao, GVS
Chowdari, BVR
机构：
[1] Natl Univ Singapore, Dept Mat Sci, Singapore 119260, Singapore
[2] Natl Univ Singapore, Dept Phys, Singapore 119260, Singapore
来源：
ACTA MATERIALIA | 2004年 / 52卷 / 06期
关键词：
mechanical alloying; Mossbauer effect; X-ray diffraction; superconductors; magnetic properties;
D O I：
10.1016/j.actamat.2003.12.001
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Mechanical milling of Mg1-x FexB2 with x = 0-0.4 led to the formation of amorphous phase. For x = 0, the hexagonal MgB2 phase was formed after it heat treatment at 450 degreesC or above with critical temperature T-c = 38-40 K. Fe-substituted MgB2 phase was formed after annealing at 450 degreesC or above when x = 0.05. 0.1 and 0.2. Fe solubility in the MgB2 phase decreased with increasing annealing temperature, while lattice parameters (a and c) decreased. It has been found that critical temperature Tc increased with increasing annealing temperature. For Mg0.6Fe0.4B2 powder, MgB2 phase could not be formed after crystallization. Single solid-solution MgB2 phase could be formed in Mg0.95Fe0.05B2 after annealing at 450 degreesC. This sample exhibited paramagnetic between 30 and 290 K with a high magnetic moment of mu(Fe) = 5.5-6.0mu(B), An anomaly (minimum in reciprocal magnetic susceptibility) was observed below 30 K. accompanied by magnetic splitting in Mossbauer Spectroscopy. (C) 2003 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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收藏
页码：1543 / 1553
页数：11
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