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RESEARCH PRODUCT
Probing the Size Effect of Co2FeGa-SiO2@C Nanocomposite Particles Prepared by a Chemical Approach
Yanzhi GuoLubna BasitVadim KsenofontovCarsten SönnichsenChang-hai WangTeuta GasiYeukuang HwuGerhard H. FecherFrederick CasperJey-jau LeeBenjamin BalkeClaudia FelserYuriy Khalavkasubject
Materials scienceNanocompositeGeneral Chemical EngineeringNanoparticleNanotechnologyGeneral ChemistryX-ray absorption fine structureChemical engineeringMössbauer spectroscopyParticle-size distributionMaterials ChemistryParticle sizeSpectroscopySuperparamagnetismdescription
In this contribution, we report the chemical synthesis of carbon coated, silica supported Co2FeGa (Co2FeGa-SiO2@C) nanocomposite particles. The particle size of Co2FeGa particles can be tuned by varying the amount of silica supports. The dependences of the crystal structure and magnetic properties on particle size have been investigated by synchrotron radiation based X-ray diffraction (XRD), X-ray absorption fine structure (XAFS) spectroscopy, transmission electron microscope (TEM), 57Fe Mossbauer spectroscopy, and superconducting quantum interference device (SQUID). The superparamagnetic critical size of Co2FeGa Heusler nanoparticles is found to be ∼17 nm by correlating the TEM derived particle size distribution to the Mossbauer spectroscopy data. The effects of silica supports and carbon coating on the formation of Co2FeGa nanoparticles of various sizes are also discussed.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-12-01 | Chemistry of Materials |