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Magnetic behaviour of the MTbF(6) fluoroterbates (M=Cd, Ca, Sr, (alpha/beta)-Ba)

Author:
Josse, M.  El-Ghozzi, M.  Avignant, D.  Andre, G.  Bouree, F.  Isnard, O.  


Journal:
JOURNAL OF SOLID STATE CHEMISTRY


Issue Date:
2012


Abstract(summary):

Neutron powder diffraction has been performed on the MTbF(6) fluorides (M=Cd, Ca, Sr, (alpha/beta)-Ba). Four of these fluorides (Cd, Ca, Sr, beta-Ba) are built of a (pseudo-) tetragonal packing of [TbF(6)](2-) chains and only differs by the chains relative orientations. Thus this series represents a valuable opportunity to evaluate the Tb(4+)-Tb(4+) magnetic interactions. All the compounds displayed antiferromagnetic order (T(N)=2.70 K (Cd), 2.15 K (Ca), 2.60 K (Sr), 2.10 K (beta-Ba)), except for the alpha form of BaTbF(6). The crystal structure of this latter fluoroterbate has also been investigated by means of high-resolution neutron powder diffraction. From Neutron Powder Diffraction data, CdTbF(6) and beta-BaTbF(6) magnetic structures were determined, together with the metamagnetic behaviour of beta-BaTbF(6) as a function of an external magnetic field. A tentative phase diagram is then given for beta-BaTbF(6). Advantage was taken of the polymorphism of the BaTbF(6) fluoroterbate to analyse, on the basis of topological parameters such as bond distances and angles, the magnetic behaviour of its alpha and beta forms. It was shown that superexchange interactions are present in beta-BaTbF(6), and that these interactions may also rule the magnetic behaviour of the other MTbF(6) (M=Ca, Sr, Cd) tetravalent terbium fluorides. (C) 2011 Elsevier Inc. All rights reserved.


Page:
229---237


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