Crystal structure and magnetism of the double perovskites Sr3Fe2TeO9 and Ba3Fe2TeO9: a neutron diffraction study

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

Royal Society of Chemistry

Año: 2006 vol. 16 p. 4235 - 4235

p class="MsoNormal" style="text-align: justify; line-height: 200%; margin: 0cm 0cm 0pt;">Sr3Fe2TeO9 and Ba3Fe2TeO9 double perovskites have been prepared in polycrystalline form by solid state reaction, in air. These materials have been studied by X-ray diffraction (XRD), neutron powder diffraction (NPD) and magnetic measurements. At room temperature, the crystal structure of Sr3Fe2TeO9 is tetragonal, space group I4/m, with a = b = 5.55902(4) Å, c = 7.885(1) Å, whereas Ba3Fe2TeO9 presents a hexagonal lattice, space group P63/mmc, with a = 5.7670(1) Å, c =14.1998(4) Å. The structure of Sr3Fe2TeO9, which can ideally be rewritten as Sr2Fe(Fe1/3Te2/3)O6, can be described as the result of a sing