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Pawel's Project Page - RISE summer 2005 |
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Intern: Pawel W. Majewski, Warsaw University
Mentor: Brian Naughton
Faculty Supervisor: David R. Clarke
Department: Materials |
SYNTHESIS AND CHARACTERIZATION OF NANOSIZED FERRITES COATED WITH SILICA
Nanosized ferrites present unique magnetic properties that are not found
in the bulk materials. They display no hysteresis effect and can operate as
inductors at much higher frequencies than conventional elements. In this work
we focus on preparation and characterization of nickel-zinc ferrites (5-20 nm
in diameter) produced by the aqueous precipitation technique. Particles are
coated with a silica layer to obtain the magnetic material with desired particle
separation and low conductivity. Coating reaction is conducted in the basic
ethanol based solution with a tetraethoxysilicate (TEOS) as silica-forming
precursor. After the reaction, particles are pressed into pellets. The final
product along with the samples from previous steps are characterized by the
following techniques: SQUID measurements for DC magnetic properties characterization,
high frequency magnetic susceptibility measurements, X-Ray Powder
Diffractometry (XRD), and Small Angle X-Ray Scattering (SAXS) for particle-size
determination. Additionally, Ion Coupled Plasma Atomic Emission Spectrometry
(ICP-AES) is used for chemical composition determination. The information
from these techniques helps draw a connection between synthesis procedure
and final material properties. As a result this project will help to expand
the knowledge and understanding of nano-scale material structure and properties.
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