Magnetic Properties of Nanoparticles Obtained by Different Chemical Routes

$113.00 plus tax (Refund Policy)

Buy Article:

Abstract:

It is well known that nano-sized materials often present chemical, electronic, magnetic, and mechanical properties that are potentially interesting for many technological applications comparatively to their corresponding bulk properties. This paper describes the main differences in magnetic properties among nanomagnetite powders prepared by three methods: (I) reduction–precipitation of ferric chloride by reaction with Na2SO3; (II) reduction of hematite with coal, and (III) reduction of hematite with hydrogen gas. The obtained materials were characterized by powder X-ray diffraction (XRD), saturation magnetization measurements, and Mössbauer spectroscopy. Saturation magnetization values varied from 60 to 86 J T−1 kg−1. XRD and Mössbauer spectroscopy results at 298 K showed the clear effect of the preparation routes on the crystallographic structure and crystallite size of the magnetic species. Magnetite was formed in varying proportions in all samples, with crystallite sizes estimated by Scherrer formula of about 10, 26, and 33 nm for samples prepared by methods (I), (II), and (III), respectively. The Mössbauer spectrum of the sample prepared by method (I) consisted of broad lines and hyperfine field for magnetite lower than that typically reported for the bulk material.

Keywords: IRON OXIDES; MAGNETITE; NANOPARTICLES

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2009.423

Publication date: March 1, 2009

More about this publication?
  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Terms & Conditions
  • ingentaconnect is not responsible for the content or availability of external websites
Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more