Magnetic properties of bio-synthesized zinc ferrite nanoparticles

Lucas W. Yeary; Ji Won Moon; Claudia J. Rawn; Lonnie J. Love; Adam J. Rondinone; James R. Thompson; Bryan C. Chakoumakos; Tommy J. Phelps

doi:10.1016/j.jmmm.2011.06.049

Magnetic properties of bio-synthesized zinc ferrite nanoparticles

Lucas W. Yeary, Ji Won Moon, Claudia J. Rawn, Lonnie J. Love, Adam J. Rondinone, James R. Thompson, Bryan C. Chakoumakos, Tommy J. Phelps

Single Crystal Diffraction

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Abstract

The magnetic properties of zinc ferrite (Zn-substituted magnetite, Zn _yFe_1-yFe₂O₄) formed by a microbial process compared favorably with chemically synthesized materials. A metal reducing bacterium, Thermoanaerobacter, strain TOR-39 was incubated with Zn _xFe_1-xOOH (x=0.01, 0.1, and 0.15) precursors and produced nanoparticulate zinc ferrites. Composition and crystalline structure of the resulting zinc ferrites were verified using X-ray fluorescence, X-ray diffraction, transmission electron microscopy, and neutron diffraction. The average composition from triplicates gave a value for y of 0.02, 0.23, and 0.30 with the greatest standard deviation of 0.02. Average crystallite sizes were determined to be 67, 49, and 25 nm, respectively. While crystallite size decreased with more Zn substitution, the lattice parameter and the unit cell volume showed a gradual increase in agreement with previous literature values. The magnetic properties were characterized using a superconducting quantum interference device magnetometer and were compared with values for the saturation magnetization (M_s) reported in the literature. The averaged M_s values for the triplicates with the largest amount of zinc (y=0.30) gave values of 100.1, 96.5, and 69.7 emu/g at temperatures of 5, 80, and 300 K, respectively indicating increased magnetic properties of the bacterially synthesized zinc ferrites.

Original language	English
Pages (from-to)	3043-3048
Number of pages	6
Journal	Journal of Magnetism and Magnetic Materials
Volume	323
Issue number	23
DOIs	https://doi.org/10.1016/j.jmmm.2011.06.049
State	Published - Dec 2011

Funding

This work was supported by the Defense Advanced Research Projects Agency (DARPA) Biomagnetics Program under contract 1868-HH43-X1. J.-W. Moon was partly supported by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the US Department of Energy. J.R. Thompson was supported by the Division of Materials Sciences and Engineering, Office of Basic Energy Science, US Department of Energy. Oak Ridge National Laboratory is managed by UT-Battelle, LLC, for the US Department of Energy under contract DE-AC05-00OR22725 . Notice: This manuscript has been authored by UT-Battelle, LLC, under contract no. DE-AC05-00OR22725 with the US Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes.

Funders	Funder number
U.S. Department of Energy
Defense Advanced Research Projects Agency	1868-HH43-X1
Basic Energy Sciences	DE-AC05-00OR22725
Oak Ridge National Laboratory
Division of Materials Sciences and Engineering

Keywords

Lattice parameter
Magnetism
Microbial synthesis
Zn-ferrite

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10.1016/j.jmmm.2011.06.049

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title = "Magnetic properties of bio-synthesized zinc ferrite nanoparticles",

abstract = "The magnetic properties of zinc ferrite (Zn-substituted magnetite, Zn yFe1-yFe2O4) formed by a microbial process compared favorably with chemically synthesized materials. A metal reducing bacterium, Thermoanaerobacter, strain TOR-39 was incubated with Zn xFe1-xOOH (x=0.01, 0.1, and 0.15) precursors and produced nanoparticulate zinc ferrites. Composition and crystalline structure of the resulting zinc ferrites were verified using X-ray fluorescence, X-ray diffraction, transmission electron microscopy, and neutron diffraction. The average composition from triplicates gave a value for y of 0.02, 0.23, and 0.30 with the greatest standard deviation of 0.02. Average crystallite sizes were determined to be 67, 49, and 25 nm, respectively. While crystallite size decreased with more Zn substitution, the lattice parameter and the unit cell volume showed a gradual increase in agreement with previous literature values. The magnetic properties were characterized using a superconducting quantum interference device magnetometer and were compared with values for the saturation magnetization (Ms) reported in the literature. The averaged Ms values for the triplicates with the largest amount of zinc (y=0.30) gave values of 100.1, 96.5, and 69.7 emu/g at temperatures of 5, 80, and 300 K, respectively indicating increased magnetic properties of the bacterially synthesized zinc ferrites.",

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author = "Yeary, {Lucas W.} and Moon, {Ji Won} and Rawn, {Claudia J.} and Love, {Lonnie J.} and Rondinone, {Adam J.} and Thompson, {James R.} and Chakoumakos, {Bryan C.} and Phelps, {Tommy J.}",

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AU - Love, Lonnie J.

AU - Rondinone, Adam J.

AU - Thompson, James R.

AU - Chakoumakos, Bryan C.

AU - Phelps, Tommy J.

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AB - The magnetic properties of zinc ferrite (Zn-substituted magnetite, Zn yFe1-yFe2O4) formed by a microbial process compared favorably with chemically synthesized materials. A metal reducing bacterium, Thermoanaerobacter, strain TOR-39 was incubated with Zn xFe1-xOOH (x=0.01, 0.1, and 0.15) precursors and produced nanoparticulate zinc ferrites. Composition and crystalline structure of the resulting zinc ferrites were verified using X-ray fluorescence, X-ray diffraction, transmission electron microscopy, and neutron diffraction. The average composition from triplicates gave a value for y of 0.02, 0.23, and 0.30 with the greatest standard deviation of 0.02. Average crystallite sizes were determined to be 67, 49, and 25 nm, respectively. While crystallite size decreased with more Zn substitution, the lattice parameter and the unit cell volume showed a gradual increase in agreement with previous literature values. The magnetic properties were characterized using a superconducting quantum interference device magnetometer and were compared with values for the saturation magnetization (Ms) reported in the literature. The averaged Ms values for the triplicates with the largest amount of zinc (y=0.30) gave values of 100.1, 96.5, and 69.7 emu/g at temperatures of 5, 80, and 300 K, respectively indicating increased magnetic properties of the bacterially synthesized zinc ferrites.

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Magnetic properties of bio-synthesized zinc ferrite nanoparticles

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