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Neutron powder diffraction study of phase transitions in Sr2SnO4 |
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| Authors: | WT Fu D Visser DJW IJdo |
| Institution: | 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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