DocumentCode
1039878
Title
Distribution of cations and phase transition in ferrite Cu0.5 Fe2.5 O4
Author
Simsa, Zdenek
Author_Institution
Czechoslovac Academy of Sciences, Prague, Czechoslovakia
Volume
5
Issue
3
fYear
1969
fDate
9/1/1969 12:00:00 AM
Firstpage
592
Lastpage
595
Abstract
The measurements of the temperature dependence of electrical resistivity, Seebeck coefficient, and the saturation magnetization were performed on polycrystals Cu0.5 Fe2.5 O4+γ With all samples the anomalous behavior above 400°C was observed which manifested itself by a sudden increase of electrical resistivity, by the change from 
to 
type of electrical conductivity, and by the irreversible course of the magnetization. Contrary to physical properties, the chemical analysis revealed no significant changes in the composition of ferrites during the transformation. Taking into account the electrical, magnetic, and X-ray investigation it was concluded that in quenched samples (Cu1++ Fe3+) and Cu2++ Fe2+) pairs are more stable in the tetrahedral and the octahedral sites of the spinel lattice, respectively. After the transformation only Cu1+and Fe3+are present in the ferrites which initiates their decomposition into haematite and delafossite.
to type of electrical conductivity, and by the irreversible course of the magnetization. Contrary to physical properties, the chemical analysis revealed no significant changes in the composition of ferrites during the transformation. Taking into account the electrical, magnetic, and X-ray investigation it was concluded that in quenched samples (Cu1++ Fe3+) and Cu2++ Fe2+) pairs are more stable in the tetrahedral and the octahedral sites of the spinel lattice, respectively. After the transformation only Cu1+and Fe3+are present in the ferrites which initiates their decomposition into haematite and delafossite.Keywords
Copper ferrites; Ferrites; Chemical analysis; Conductivity measurement; Electric resistance; Electric variables measurement; Ferrites; Iron; Performance evaluation; Saturation magnetization; Temperature dependence; Temperature measurement;
fLanguage
English
Journal_Title
Magnetics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9464
Type
jour
DOI
10.1109/TMAG.1969.1066483
Filename
1066483
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