Mossbauer and Electrochemical Investigations of Carbon-Rich Fe1-xCx Films

被引：7

作者：

Zhao, Xiuyun ^{[1
,2
,3
]}

Sanderson, R. J. ^{[1
,3
]}

MacEachern, L. ^{[1
,2
,3
]}

Dunlap, R. A. ^{[1
,3
,4
]}

Obrovac, M. N. ^{[1
,2
,3
]}

机构：

[1] Dalhousie Univ, Dept Phys & Atmospher Sci, Halifax, NS B3H 4R2, Canada

[2] Dalhousie Univ, Dept Chem, Halifax, NS B3H 4R2, Canada

[3] Dalhousie Univ, Inst Mat Res, Halifax, NS B3H 4R2, Canada

[4] Dalhousie Univ, Coll Sustainabil, Halifax, NS B3H 4R2, Canada

来源：

ELECTROCHIMICA ACTA | 2015年 / 170卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Mossbauer spectroscopy; lithium batteries; carbon-rich Fe-C alloy; sputtering; LITHIUM INSERTION; LI; ANODE; CRYSTALLIZATION; NANOPARTICLES; CAPACITY; SYSTEM; ALLOYS;

D O I：

10.1016/j.electacta.2015.04.116

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

A thin film binary library of carbon-rich Fe1-xCx (0.47 < x < 0.97) alloys was prepared by combinatorial sputtering of carbon and iron. The sputtered library was characterized by X-ray diffraction and room temperature Fe-57 Mossbauer effect spectroscopy to determine its microstructure. X-ray diffraction results show that the Fe1-xCx film is amorphous in the whole composition range of the library. For 0.52 <= x <= 0.59, a hyperfine field distribution and a quadrupole splitting distribution as obtained from Mossbauer spectra indicate the presence of a ferromagnetic phase and a paramagnetic phase in this regime. With increasing of carbon content, for 0.61 <= x <= 0.97, the sextet disappears and two paramagnetic doublets splitting appear suggesting two different Fe sites. The electrochemical performance of the Fe1-xCx film was investigated in lithium cells and the presence of Fe was found to increase the reversible capacity per mass of carbon over that of a pure carbon electrode. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：16 / 24

页数：9

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