Investigation of the phase transition in Cu0.5Fe2.5O4 by DTA |
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Authors: | Z Šimša P Holba |
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Institution: | (1) Institute of Solid State Physics, Czechoslovak Academy of Sciences, Prague, Czechoslovakia |
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Abstract: | The DTA curves of the quenched ferrites Cu0.5Fe2.5O4+y
displayed both an exothermic peak at 500–740° and an endothermic peak at about 1000° while slowly cooled samples showed only the high-temperature endothermic peak. It was confirmed by X-ray diffraction studies that the exothermic peak is due to the decomposition of the ferrite at these temperatures into hematite and delafossite. On the other hand, the endothermic peak was found to be caused by re-formation of the ferrite above 1000°. A tentative phase diagram of the ferrites Cu0.5Fe2.5O4+y
is presented.
Zusammenfassung Die DTA Kurven von schnell abgekühlten Ferriten der Zusammensetzung Cu0.5Fe2.5O4+y
enthielten die exothermische Spitze zwischen 500–740°, sowie die endothermische Spitze bei ungefähr 1000°, während langsam abgekühlte Proben nur die letztere aufwiesen. Die Röntgendiffraktionsanalyse zeigte, daß die exothermische Spitze durch Umlagerung des Ferrits in Hämatit und Delafossit, die endothermische Spitze hingegen durch die Neubildung des Ferrits bei ungefähr 1000° hervorgerufen wird. Es wurde ein Versuch zur Darstellung des Phasendiagramms der Ferrite des Typs Cu0.5Fe2.5O4+y
unternommen.
Résumé Les courbes d'ATD des ferrites trempées, de type Cu0.5Fe2.5O4+y
présentent un pic exothermique à 500–740° et un autre, endothermique, vers 1000°. Seul ce dernier pic apparaît dans le cas d'échantillons refroidis lentement. D'après les études par diffraction de rayons X, l'effet exothermique est dû à une décomposition de la ferrite en hématite et en delafossite. L'effet endothermique correspond à une nouvelle formation de ferrite au-dessus de 1000°. Essai pour représenter le diagramme de phase des ferrites Cu0.5Fe2.5O4+y
.
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