Gadolinium-iron ferrites: composition and structure

Tsagaroyannis, J; Haralambous, KJ; Loizos, Z; Spyrellis, N

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	https://dspace.lib.ntua.gr/xmlui/handle/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