Preparation, Crystal and Magnetic Structure of Two New Double Perovskites: Ca2CoTeO6 and Sr2CoTeO6

M.S. AUGSBURGER; M.C. VIOLA; J.C. PEDREGOSA; A. MUÑOZ; J. A. ALONSO; R. E. CARBONIO

Royal Society of Chemistry

Lugar: Cambridge, Inglaterra; Año: 2005 vol. 15 p. 993 - 993

a2CoTeO6 and Sr2CoTeO6 double perovskites have been prepared as polycrystalline powders by solid state reaction, in air. These materials have been studied by X-ray, neutron powder diffraction (NPD) and magnetic measurements. At room temperature, the crystal structure is monoclinic, space group P21/n for both compounds with a= 5.4569(2)Å, b= 5.5904(2)Å, c= 7.7399(2)Å, = 90.239(2)° and a= 5.6417(2)Å, b= 5.6063(2)Å, c= 7.9234(2)Å, = 90.117(4)° for Ca2CoTeO6 and Sr2CoTeO6 respectively. The perovskite lattices contain an almost co