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2009 | 7 | 3 | 410-414
Tytuł artykułu

Synthesis of Co3O4 nanoparticles by oxidation-reduction method and its magnetic characterization

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Without any surfactant, antiferromagnetic Co3O4 nanoparticles were synthesized successfully for the first time by means of an oxidation-reduction method with cobalt sulfate as starting material, which was oxidized to cobalt salt by NaNO3 after alkalinizing with NaOH. Morphological, structural, spectroscopic and magnetic characterization of the product were done by SEM, TEM, XRD, and VSM, respectively. The average crystallite size (on the base of line profile fitting method), D and σ, is estimated as 30 ± 6 nm. Some anomalous magnetic properties and their enhanced effect have been observed in Co3O4 antiferromagnetic nanocrystallites, including a bias field, coercivity, permanent magnetic moments and an open loop. These phenomena are attributed to the unidirectional anisotropy which is caused by the exchange coupling between AFM and FM layers, the existence of the spin glass like surface spins of Co3O4 nanoparticles due to size effects and surface-area effect. [...]
Słowa kluczowe
Wydawca

Czasopismo
Rocznik
Tom
7
Numer
3
Strony
410-414
Opis fizyczny
Daty
wydano
2009-09-01
online
2009-06-21
Twórcy
autor
  • Department of Chemistry, Fatih University, Hadimköy, 34500, Istanbul, Turkey
autor
  • Department of Chemistry, Fatih University, Hadimköy, 34500, Istanbul, Turkey, hbaykal@fatih.edu.tr
autor
  • Department of Physics, Fatih University, Hadimköy, 34500, Istanbul, Turkey
autor
  • Department of Physics, Fatih University, Hadimköy, 34500, Istanbul, Turkey
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_s11532-009-0012-4
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