Crystal Structure and Magnetic Properties of a New Oxyselenide of Gadolinium and Titanium: Gd4TiSe4O4
| Autor: | Catherine Deudon, Vincent Meignen, Alain Meerschaut, Alain Lafond |
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| Rok vydání: | 2001 |
| Předmět: |
Magnetism
Chemistry Crystal structure Condensed Matter Physics Trigonal prismatic molecular geometry Magnetic susceptibility Electronic Optical and Magnetic Materials Inorganic Chemistry Crystallography Nuclear magnetic resonance Octahedron Materials Chemistry Ceramics and Composites Antiferromagnetism Physical and Theoretical Chemistry Saturation (magnetic) Monoclinic crystal system |
| Zdroj: | Journal of Solid State Chemistry. 162:182-187 |
| ISSN: | 0022-4596 |
| DOI: | 10.1006/jssc.2001.9223 |
| Popis: | A new compound Gd 4 TiSe 4 O 4 has been obtained by a solid state reaction of Gd 2 O 3 , TiO 2 , and TiSe 2 , at T =1000°C, with the addition of iodine to favor crystallization. Single-crystal X-ray diffraction measurements show that Gd 4 TiSe 4 O 4 crystallizes in space group C 2/ m (No. 12) of the monoclinic system with two formula units in a cell of dimensions a =15.7878(4) A, b =3.7610(2) A, c =9.6639(3) A, and β =117.569(2)°. The structure contains two crystallographically independent Gd atoms with a bicapped trigonal prismatic coordination. Association of four adjacent Gd-centered polyhedra constitutes the elemental building unit, which develops into ribbons along b . The ribbons are interconnected by infinite chains of edge-sharing Ti-centered octahedra. Magnetic susceptibility of the title compound has been measured from 1.8 to 300 K, and from B =1.10 −3 to 0.1 T for the ZFC and FC cooling modes. The linear variation of the inverse susceptibility versus T can be modeled with a Curie–Weiss law in agreement with a Gd 3+ free ion behavior. The maximum of the χ (T) curve at about 2.5 K could be attributed to both an antiferromagnetic transition and the saturation of the weak ferromagnetic component. |
| Databáze: | OpenAIRE |
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