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Gadolinium-iron ferrites: composition and structure

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dc.contributor.author Tsagaroyannis, J en
dc.contributor.author Haralambous, KJ en
dc.contributor.author Loizos, Z en
dc.contributor.author Spyrellis, N en
dc.date.accessioned 2014-03-01T01:08:48Z
dc.date.available 2014-03-01T01:08:48Z
dc.date.issued 1992 en
dc.identifier.issn 0167-577X en
dc.identifier.uri http://hdl.handle.net/123456789/10708
dc.subject Iron en
dc.subject.classification Materials Science, Multidisciplinary en
dc.subject.classification Physics, Applied en
dc.subject.other Composition en
dc.subject.other Firing (of materials) en
dc.subject.other Gadolinium compounds en
dc.subject.other Iron oxides en
dc.subject.other Microstructure en
dc.subject.other Mossbauer spectroscopy en
dc.subject.other Perovskite en
dc.subject.other X ray spectroscopy en
dc.subject.other Ferrite formation en
dc.subject.other Firing atmosphere effects en
dc.subject.other Gadolinium iron ferrites en
dc.subject.other Oxide composition effects en
dc.subject.other X ray diffraction en
dc.subject.other Ferrites en
dc.title Gadolinium-iron ferrites: composition and structure en
heal.type journalArticle en
heal.identifier.primary 10.1016/0167-577X(92)90159-H en
heal.identifier.secondary http://dx.doi.org/10.1016/0167-577X(92)90159-H en
heal.language English en
heal.publicationDate 1992 en
heal.abstract The composition and structure of some mixed gadolinium-iron oxides has been investigated in relation to their preparation conditions. Gadolinium ferrites were prepared by employing a wet chemical method. Different ratios of gadolinium to iron oxides were used and the formation of the ferrites was studied over a temperature range of 700-1500-degrees-C. Specifically, pure gadolinium and iron oxides as well as hydrated mixed oxides with a Gd:Fe atom ratio of 1:1, 3:5 and 2:1 were fired at designated temperatures up to 1480-degrees-C in air and inert argon atmospheres. The firing procedure was followed by subsequent quenching at room temperature, in order that the ferrites would maintain the composition and structure attained at the higher temperature. The changes in composition and structure of the ferrites, taking place as a function of temperature, firing atmosphere, and initial oxide composition used, were investigated by thermal analysis, X-my diffraction and Mossbauer spectra. It is shown that the ferrite composition and structure depend on the Gd : Fe atom ratio and the preparation conditions. Above 1400-degrees-C, the mixtures of a 1:1 Gd:Fe atomic ratio tend to form the perovskite (orthoferrite) phase (GdFeO3), whilst the 3: 5 mixtures form the garnet phase (Gd3Fe5O12). On the other hand, 2:1 mixtures contain the perovskite and gadolinium oxide phases at the same elevated temperatures. en
heal.publisher ELSEVIER SCIENCE BV en
heal.journalName Materials Letters en
dc.identifier.doi 10.1016/0167-577X(92)90159-H en
dc.identifier.isi ISI:A1992JJ50600008 en
dc.identifier.volume 14 en
dc.identifier.issue 4 en
dc.identifier.spage 214 en
dc.identifier.epage 221 en


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