Hexagonal CoSe formation in mechanical alloyed Co75Se25 mixture

被引：38

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：

SOLID STATE COMMUNICATIONS | 2004年 / 131卷 / 3-4期

基金：

巴西圣保罗研究基金会;

关键词：

mechanical alloying; nanocrystalline materials; X-ray diffraction; differential scanning calorimetry; Raman spectroscopy;

D O I：

10.1016/j.ssc.2004.03.044

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

A hexagonal CoSe alloy with NiAs-type structure was obtained by mechanical alloying starting from a mixture of pure crystalline powders with nominal composition Co75Se25. X-ray diffraction (XRD), differential scanning calorimetry (DSC), Mossbauer spectroscopy (MS) and Raman scattering (RS) techniques were used to follow the structural, thermal, magnetic and optical properties of the binary mixture as a function of milling time. XRD results show the formation of a nanometric hexagonal CoSe phase between 3 and 70 h of milling coexisting with non-reacted Co phases, also in nanometric scale. DSC and RS results showed some changes in the thermal and optical properties of the crystalline phases when the milling time increases. The Raman active modes of the CoSe and Co oxide phases were observed. MS results showed practically no iron in the samples milled up to 15 h, while for extended milling times (70 h), they showed the presence of some alpha-Fe and the formation of other iron alloys due to the contamination by the milling media. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：265 / 270

页数：6

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