Abstracts 2006

Abstract of Publication No. 556

K. M. Mogare, D. V. Sheptyakov, R. Bircher, H.-U. Güdel and M. Jansen
Neutron diffraction study of the magnetic structure of Na2RuO4
Eur. Phys. J. B 52, 371-376 (2006)      Full Text (PDF)      DOI-Link     

Abstract: Nuclear and magnetic structures of sodium ruthenate (VI) have been studied by neutron powder diffraction in the temperature range 1.5200K. Na2RuO4 crystallizes in the monoclinic structure, with space group P 21/c. The structure consists of apical corner sharing RuO5 trigonal bipyramids forming infinite chains running along the b axis. These infinite [ RuO3O2/2] chains form a pseudo hexagonal close packing of rods with RuRu distances of 3.51 within the chains and 5.305.47 between the chains. At TN = 37.2K a magnetic transition leads to an antiferromagnetic state. The Ru6+ magnetic moments are ordered antiferromagnetically along the chains (b-axis), while the inter-chain interaction is ferromagnetic. A classical infinite chain model was fitted to the magnetic susceptibility data in order to estimate the strength of the nearest-neighbor exchange interactions along and between the chains, resulting in an intrachain coupling parameter of 2J = -86K, and an interchain parameter J with |2J| = 3 K.

Last modified: 13.12.11 by Gabriela Frei