Acta Crystallographica Section B

Structural Science

Volume 64, Part 6 (December 2008)

research papers

Acta Cryst. (2008). B64, 661-668 [ doi:10.1107/S010876810803214X ]

Structural behaviour of synthetic Co₂SiO₄ at low temperatures

A. Sazonov, M. Meven, V. Hutanu, V. Kaiser, G. Heger, D. Trots and M. Merz

Abstract: Synthetic Co₂SiO₄ has an olivine structure with isolated SiO₄ groups (space group Pnma) and shows magnetic ordering below 50 K. Single-crystal neutron diffraction was applied to determine precise crystal structure parameters at low temperatures. No structural phase transition was revealed in the temperature range 2.5-300 K. Lattice parameters were determined by high-resolution X-ray powder diffraction between 15 and 300 K. There is a clear evidence of an anomalous thermal expansion related to the magnetic phase transition which can be attributed to magnetostriction.

Keywords: olivine structure; low temperature; phase transitions; thermal expansion.


	Structure factor file (CIF format) (79.5 kbytes) [ doi:10.1107/S010876810803214X/bp5014300Ksup2.hkl ] Contains datablock 300K

	Structure factor file (CIF format) (71.7 kbytes) [ doi:10.1107/S010876810803214X/bp501455Ksup3.hkl ] Contains datablock 55K

	Structure factor file (CIF format) (69.7 kbytes) [ doi:10.1107/S010876810803214X/bp50142point5Ksup4.hkl ] Contains datablock 2.5K

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