Structure and Magnetic Properties of Sr2CoWO6: An Ordered Double Perovskite Containing Co2+(HS) with Unquenched Orbital Magnetic Moment

Autor: María Jesús Martínez-Lope, M. C. Viola, María Teresa Fernández-Díaz, Silvina Pagola, José Luis Martínez, J. M. De Paoli, Raúl E. Carbonio, José C. Pedregosa, José Antonio Alonso
Rok vydání: 2003
Předmět:
Zdroj: ChemInform. 34
ISSN: 1522-2667
0931-7597
Popis: Sr2CoWO6 perovskite has been prepared in polycrystalline form by solid-state reaction at 1150 °C. This material has been studied by high-resolution synchrotron X-ray and neutron powder diffraction (NPD), magnetic measurements, and differential scanning calorimetry (DSC). At room temperature, the crystal structure is tetragonal, space group I4/m, with a = 5.58277(1) A and c = 7.97740(1) A. The structure contains alternating CoO6 and WO6 octahedra, tilted in anti-phase by 7.24° in the basal ab plane along the [001] direction of the pseudocubic cell. This corresponds to the a0a0c- Glazer's notation as derived by Woodward for 1:1 ordering of double perovskites, consistent with space group I4/m. DSC and NPD measurements as a function of temperature indicate a structural transition from tetragonal to monoclinic (space group P21/n) at 260 K. At 2 K the cell parameters are a = 5.61267(8) A, b = 5.58753(8) A, c = 7.8994(1) A, and β = 90.041(3)°. The structure contains alternating CoO6 and WO6 octahedra, tilted in-...
Databáze: OpenAIRE
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