UNSPECIFIED (2004) Spin glass-like antiferromagnetic interactions in iron phosphate glasses. In: 10th International Conference on the Physics of Non-Crystalline Solids (PNCS), Univ Parma, Parma, ITALY, JUL 13-17, 2003. Published in: JOURNAL OF NON-CRYSTALLINE SOLIDS, 345-46 pp. 245-250.

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Abstract

The phenomenon of spin freezing at low temperatures in iron-containing oxide glasses resulting from antiferromagnetic interactions has been previously reported for several oxide glass systems. The temperature dependence of the DC magnetic susceptibility has been measured with a SQUID magnetometer for a series of four iron oxide-phosphorus pentoxide glasses, containing between 30 and 44 mol% Fe2O3, and prepared so as to have an Fe3+ fraction of similar to0.8. Well defined cusps are observed in the susceptibilities at temperatures between 5 K and 8 K for the four samples, cooled in zero field and measured at 0.025 T. As for classical metallic spin glass alloys, the susceptibilities measured after cooling from high temperature in this field are almost constant below the cusp temperatures, corresponding to spins freezing into a complicated configuration. Similar measurements at 0.5 T also demonstrate the freezing transition but the cusps in the susceptibility after zero-field cooling are broadened. The distribution and environments of iron ions within the samples are discussed in the light of the temperature-dependent magnetic structure factors and spin correlation functions, observed in neutron diffraction experiments on the same samples, along with the nuclear real space total correlation functions. (C) 2004 Elsevier B.V. All rights reserved.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	T Technology > TP Chemical technology T Technology > TA Engineering (General). Civil engineering (General)
Journal or Publication Title:	JOURNAL OF NON-CRYSTALLINE SOLIDS
Publisher:	ELSEVIER SCIENCE BV
ISSN:	0022-3093
Date:	15 October 2004
Volume:	345-46
Number of Pages:	6
Page Range:	pp. 245-250
Identification Number:	10.1016/j.jnoncrysol.2004.08.090
Publication Status:	Published
Title of Event:	10th International Conference on the Physics of Non-Crystalline Solids (PNCS)
Location of Event:	Univ Parma, Parma, ITALY
Date(s) of Event:	JUL 13-17, 2003
URI:	http://wrap.warwick.ac.uk/id/eprint/7596

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