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Neutron powder diffraction study of phase transitions in Sr2SnO4 |
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| Authors: | W.T. Fu D. Visser D.J.W. IJdo |
| Affiliation: | a Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands b NWO-Physics, ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, UK c ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, UK |
| Abstract: | The phase transitions in Sr2SnO4 at high temperature have been studied using high resolution time-of-flight powder neutron diffraction. The room temperature structure of Sr2SnO4 is orthorhombic (Pccn), which can be derived from the tetragonal K2NiF4 structure by tilting the SnO6 octahedra along the tetragonal [100]T- and [010]T-axes with non-equal tilts. At the temperature of about 423 K, it transforms to another orthorhombic structure (Bmab) characterized by the SnO6 octahedral tilt around the [110]T-axis. At still higher temperatures (∼573 K) the structure was found to be tetragonal K2NiF4-type (I4/mmm). |
| Keywords: | High-resolution neutron powder diffraction Crystal structure Phase transition |
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