The crystal structure of SmFeAsO was investigated by means of Rietveld refinement of high-resolution synchrotron powder diffraction data collected at 300K and 100K. The compound crystallizes in the tetragonal P4/nmmspace group at 300K and in the orthorhombic Cmma space group at 100K; attempts to refine the low temperature data in the monoclinic P112/n space group diverged. On the basis of both resistive and magnetic analyses the tetragonal to orthorhombic phase transition may be located at T~140 K.
Tetragonal to orthorhombic phase transition in SmFeAsO: A synchrotron
A Martinelli;C Ferdeghini;
2009
Abstract
The crystal structure of SmFeAsO was investigated by means of Rietveld refinement of high-resolution synchrotron powder diffraction data collected at 300K and 100K. The compound crystallizes in the tetragonal P4/nmmspace group at 300K and in the orthorhombic Cmma space group at 100K; attempts to refine the low temperature data in the monoclinic P112/n space group diverged. On the basis of both resistive and magnetic analyses the tetragonal to orthorhombic phase transition may be located at T~140 K.File in questo prodotto:
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