XRD, DSC, MS and RS studies of Fe75Se25 iron selenide prepared by mechano-synthesis

被引：30
作者：
Campos, CEM
de Lima, JC
Grandi, TA
Machado, KD
Drago, V
Pizani, PS
机构：
[1] Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, SC, Brazil
[2] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP, Brazil
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2004年 / 270卷 / 1-2期
基金：
巴西圣保罗研究基金会;
关键词：
nanostructures; chemical synthesis; crystal structure and symmetry; X-ray scattering; inelastic scattering;
D O I：
10.1016/j.jmmm.2003.08.003
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The structural evolution of an Fe75Se25 powder mixture under ball milling was investigated as a function of milling time. It was followed using the X-ray diffraction (XRD), differential scanning calorimetry (DSC), Mossbauer spectroscopy (MS) and Raman spectroscopy techniques. From the XRD patterns, it was observed that the beta-FeSe and/ or Fe7Se8 phase is formed for milling times between 3 and 60 h and the balance of non-reacted alpha-Fe powder is reduced to nanometric scale. For longer milling times no other crystalline phases were observed. The Mossbauer measurements showed small amounts of iron oxide between 3 and 10 h of milling, which was not observed for milling times longer than 20h. The DSC and MS results indicate the existence of an amorphous-like FeSe alloy with low crystallization temperature. The Raman measurements showed the characteristic natural vibration modes of the N-FeSe and/or Fe7Se8 phase. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码：89 / 98
页数：10
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