High-resolution neutron powder diffraction study on the structure of Sr 2SnO 4

Abstract

From the high-resolution time-of-flight neutron powder diffraction data, the crystal structure of Sr 2SnO 4 at the temperature range between 4 and 300 K has been investigated. The Rietveld refinement has shown that Sr 2SnO 4 belongs to the space group Pccn, which can be derived from the tetragonal K 2NiF 4 structure by tilting the SnO 6 octahedra along the [100] T- and [010] T-axis, respectively, with non-equal tilts. The earlier reported first-order phase transition in Sr 2SnO 4, from Bmab to P4 2 /ncm, has not been observed.