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

页码：89 / 98

页数：10

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