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Crystal Structure and Magnetic Properties of Sm2ReO5

✍ Scribed by G. Wltschek; H. Paulus; H. Ehrenberg; H. Fuess

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
337 KB
Volume
132
Category
Article
ISSN
0022-4596

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✦ Synopsis

Crystals of disamarium rhenium (IV) pentoxide, Sm 2 ReO 5 , were obtained by subsolidus reaction of samariumsesquioxide and rheniumdioxide (ratio 1 : 1) in sealed Pt 10Rh tubes at 1673 K. The structure was determined by single-crystal X-ray diffraction. Sm 2 ReO 5 crystallizes in the tetragonal system with unit cell dimensions a"8.646(3) A s and c"5.747(2) A s and space group P4/n (no. 85) with Z"4. The structure consists of isolated Re 2 O 8 groups and chains of edge-sharing Sm 4 O tetrahedra. The Re 2 O 8 groups and the (Sm 4 O) chains are interconnected by common oxygen atoms to form a three-dimensional network. Each Re 2 O 8 group is composed of a pair of rhenium each surrounded by four oxygens with a short Re-Re distance of 2.251(1) A s indicating a metal-metal bond. Rhenium has the formal oxidation state of #4. The observed magnetizations in the temperature range 1.8(T(100 K exhibits antiferromagnetic ordering below 2.4(1) K and obey a Curie-Weiss law modified by a temperature-independent Van Vleck paramagnetism of samarium (3#) for T'4.5 K.

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