Crystal structure and magnetic properties of Sm{sub 3}ReO{sub 7}

Journal Article · Thu Aug 01 04:00:00 EDT 1996 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1996.0256· OSTI ID:450697

Wltschek, G; Paulus, H; Svoboda, I; Ehrenberg, H; Fuess, H ^[1]

---

1. Technische Hochschule Darmstadt (Germany)

Crystals of a new ternary samarium rhenium oxide, Sm{sub 3}ReO{sub 7} were obtained by subsolidus reaction of samariumsesquioxide and rheniumdioxide (ratio 1.5:1) in sealed Pt-10Rh-tubes at 1673 K. The structure was determined by single-crystal X-ray diffraction. Sm{sub 3}ReO{sub 7} crystallizes in the orthorohombic system with unit cell dimensions a = 10.736(5), b = 7.392(3), and c = 7.519(3) in space group Cmcm (No. 63) with Z = 4. The structure consists of ReO{sub 6} octahedra, distorted SmO{sub 6} octahedra, and SmO{sub 8} prisms that are interconnected to each other to form a three-dimensional network. Rhenium has the formal oxidation state of +5 but no metal-metal bond is observed in this compound. The observed magnetization in the temperature range 4 K < T < 52 K is explained by a Curie-Weiss law modified by a temperature independent Van Vleck paramagnetism of samarium (3+).

• OSTI ID: 450697
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 125; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
CRYSTAL STRUCTURE
CURIE-WEISS LAW
MAGNETIC PROPERTIES
MAGNETIZATION
MATHEMATICAL MODELS
ORTHORHOMBIC LATTICES
OXIDATION
RHENIUM OXIDES
SAMARIUM OXIDES
VALENCE
X-RAY DIFFRACTION