Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 133, Issue 29, Pages 11213-11219Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja202243j
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Funding
- U.S. Department of Energy, Office of Basic Energy Sciences
- U.S. Department of Energy [DE-AC02-98CH10886]
- Brookhaven National Laboratory
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Vehicle Technologies through the Oak Ridge National Laboratory's High Temperature Materials Laboratory
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
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We synthesized monodisperse nanospheres of an intermetallic FeSn5 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 T-B = 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.
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