Structure and magnetic properties of new compounds CdYFeWO_7
来源期刊：JOURNAL OF RARE EARTHS2009年第6期
论文作者：MENG Jian Lü Minfeng WU Zhijian
Key words：frustrated magnetic materials; structure determination; magnetic properties; rare earths;
Abstract: The solid solutions of CdYFeWO_7, which are cubic pyrochlores of the type A_2B_2O_7, have been prepared and their structures were determined using Ab initio method. Rietveld refinement of the powder XRD data showed that CdYFeWO_7 adopted cubic (Fd-3m) structure,while oxides crystallized in a defect-pyrochlore structure where both O (48f) and O'(8b) sites were partially occupied, and the frustrated cations sublattice precluded long range ordering of Fe/W in the pyrochlore structure. Charge distribution analysis also suggested incomplete occupation of different oxygen sites, thus the compound was non-stoichiometric, with the formula CdYFeW_(0.98)O_(6.94). Magnetic measure-merits were carded out to find that Fe ions were in the high spin trivalent state. Curie Weiss paramagnetism down to ～5 K and the character-istic superposition between FC and ZFC suggested spin liquid rather than spin glass state.
MENG Jian1，Lü Minfeng1，WU Zhijian1
(1.State Key Laboratory of Application of Rare Earth Resources,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China)
Abstract:The solid solutions of CdYFeWO_7, which are cubic pyrochlores of the type A_2B_2O_7, have been prepared and their structures were determined using Ab initio method. Rietveld refinement of the powder XRD data showed that CdYFeWO_7 adopted cubic (Fd-3m) structure,while oxides crystallized in a defect-pyrochlore structure where both O (48f) and O''(8b) sites were partially occupied, and the frustrated cations sublattice precluded long range ordering of Fe/W in the pyrochlore structure. Charge distribution analysis also suggested incomplete occupation of different oxygen sites, thus the compound was non-stoichiometric, with the formula CdYFeW_(0.98)O_(6.94). Magnetic measure-merits were carded out to find that Fe ions were in the high spin trivalent state. Curie Weiss paramagnetism down to ～5 K and the character-istic superposition between FC and ZFC suggested spin liquid rather than spin glass state.
Key words:frustrated magnetic materials; structure determination; magnetic properties; rare earths;
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