Formation of a cubic Sr2MnWO6 phase at elevated temperature; a neutron powder diffraction study |
| |
Authors: | A.K Azad S.-G Eriksson |
| |
Affiliation: | a Studsvik Neutron Research Laboratory, Uppsala University, SE-611 82 Nyköping, Sweden b Department of Inorganic Chemistry, University of Gothenburg, SE-412 96 Göteborg, Sweden |
| |
Abstract: | In a temperature dependent neutron powder diffraction (NPD) study we observed the high temperature cubic phase at 973 K in the polycrystalline double perovskite Sr2MnWO6. Rietveld analysis of the NPD data shows that the room temperature tetragonal phase exists up to 573 K (space group P42/n, a=8.0119 (4) Å, c=8.0141(8) Å). At 773 K, the primitive tetragonal symmetry change to body-centred tetragonal (space group I4/m, a=5.6935(5) Å, c=8.077(1) Å) and finally at 973 K it becomes face-centred cubic (space group Fm-3m, a=8.0864(8) Å). The changes in the structural symmetry are connected to the small distortion of the B-site octahedra, which are insensitive to the Differential Thermal Analysis (DTA) signal. |
| |
Keywords: | 61.12.&minus q 61.12.Ld |
本文献已被 ScienceDirect 等数据库收录! |
|