Characterization of superparamagnetic MgxZn1−x
Fe2O4 powders

• Authors: Violeta Kassabova-Zhetcheva , Lilyana Pavlova , Bisserka Samuneva , Zara Cherkezova-Zheleva , Ivan Mitov , Mikhail Mikhov
• Languages of publication: EN

Abstracts

EN

Structural and magnetic properties of Mgx Zn1−x Fe2O4 powders have been studied with respect to the application for thermal cancer therapy (magnetic hyperthermia). Mgx Zn1−x Fe2O4 (x=0.1–0.5) powders with particle sizes between 5 and 8 nm were produced by citrate method. The X-ray diffraction patterns of the samples correspond to a spinel phase. The lattice constant and the volume of the elementary cell increase when x changes from 0.1 to 0.5. The FTIR-spectra ascertain the spinel phase formation. The Mossbauer studies reveal the presence of extremely small particles, which undergo superparamagnetic relaxation at room temperature. The core-shell model has been applied to explain quadruple doublets. The quadruple splitting at “shells” is bigger than those at “cores” whereas the isomer shifts remain close. Magnetic studies confirm the presence of extremely small particles that behave as superparamagnetic ones. [...]

Keywords

EN

Magnetic particles; ferrite; superparamagnetism

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2007
• Volume: 5
• Issue: 1
• Pages: 107-117

Dates

published

1 - 3 - 2007

online

1 - 3 - 2007

Contributors

author

Violeta Kassabova-Zhetcheva

• Department Technology of Silicates, University of Chemical Technology and Metallurgy, Sofia, 1756, Bulgaria

author

Lilyana Pavlova

• Department Technology of Silicates, University of Chemical Technology and Metallurgy, Sofia, 1756, Bulgaria

author

Bisserka Samuneva

• Department Technology of Silicates, University of Chemical Technology and Metallurgy, Sofia, 1756, Bulgaria

author

Zara Cherkezova-Zheleva

• Institute of Catalysis, Bulgarian Academy of Science, Sofia, 1113, Bulgaria

author

Ivan Mitov

• Institute of Catalysis, Bulgarian Academy of Science, Sofia, 1113, Bulgaria

author

Mikhail Mikhov

• Department of Condensed Matter Physics, Faculty of Physics, Sofia University, Sofia, 1164, Bulgaria

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Identifiers

DOI

10.2478/s11532-006-0069-2