Nanospheres of a new intermetallic FeSn5 phase: Synthesis, magnetic properties and anode performance in li-ion batteries

Document Type

Article

Publication Date

7-27-2011

Abstract

We synthesized monodisperse nanospheres of an intermetallic FeSn 5 phase via a nanocrystal-conversion protocol using preformed Sn nanospheres as templates. This tetragonal phase in P4/mcc space group, along with the defect structure Fe0.74Sn5 of our nanospheres, has been resolved by synchrotron X-ray diffraction and Rietveld refinement. Importantly, FeSn5, which is not yet established in the Fe - Sn phase diagram, exhibits a quasi-one dimensional crystal structure along the c-axis, thus leading to interesting anisotropic thermal expansion and magnetic properties. Magnetization measurements indicate that nanospheres are superparamagnetic above the blocking temperature TB = 300 K, which is associated with the higher magnetocrystalline anisotropy constant K = 3.33 kJ m- 3. The combination of the magnetization measurements and first-principles density functional theory calculations reveals the canted antiferromagnetic nature with significant spin fluctuation in lattice a - b plane. The low Fe concentration also leads Fe0.74Sn5 to enhanced capacity as an anode in Li ion batteries. © 2011 American Chemical Society.

Identifier

79960577929 (Scopus)

Publication Title

Journal of the American Chemical Society

External Full Text Location

https://doi.org/10.1021/ja202243j

e-ISSN

15205126

ISSN

00027863

First Page

11213

Last Page

11219

Issue

29

Volume

133

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