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Preparation, Structure, and Magnetic Studies of a New Sr11Re4O24 Double Oxide

✍ Scribed by K.G. Bramnik; G. Miehe; H. Ehrenberg; H. Fuess; A.M. Abakumov; R.V. Shpanchenko; V.Yu. Pomjakushin; A.M. Balagurov

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
300 KB
Volume
149
Category
Article
ISSN
0022-4596

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✦ Synopsis

The complex oxide Sr 11 Re 4 O 24 has been synthesized and its crystal structure was determined by a combination of X-ray powder analysis (space group I4 1 /a; a‫؍‬ 11.6779(1) A s , c ‫؍‬ 16.1488(2) A s ; Z ‫؍‬ 4) and electron di4raction. Re5nement of the crystal structure was carried out using neutron powder diffraction data ( 2 ‫؍‬ 1.85). The compound has a cation-de5cient perovskite-related structure where cation vacancies are located at the A-sublattice. Re and Sr atoms occupy B-positions in an ordered 99rock-salt:: manner. The perovskite framework is strongly distorted due to rotation of ReO 6 octahedra, leading to a formation of the eightfold coordination for Sr atoms in Bpositions. An ordered arrangement of Re Ψ‰6 and Re Ψ‰7 cations is proposed on the basis of di4erent average Re+O distances. The Sr 11 Re 4 O 24 structure could be considered as a Ca 11 Re 4 O 24 type of perovskite structure distortion. A magnetic order of Sr 11 Re 4 O 24 (ferro-or ferrimagnetic) is observed from SQUID measurements (T C ‫؍‬ 12.0 K). A moment of ‫؍‬ 0.80 B is derived from the paramagnetic region (30+200 K) for Re 6Ψ‰

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