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
Link To Document :
