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Memorias de investigación
Communications at congresses:
Structural and magnetic properties of Sr2RSbO6 (R=rare earth)double perovskites
Year:2009
Research Areas
  • Ceramics,
  • Magnetic materials
Information
Abstract
We report the preparation of the whole family of double perovskites Sr2LnSbO6 (Ln = La-Lu), which crystallize with the P21/n space group, with lattice parameters , and (¿¿90 º), being the lattice parameter of the cubic aristotype. A progressive decreasing was observed in lattice parameters with the increasing of the atomic number of the Ln cation, according with the well-known lanthanide contraction. Magnetic susceptibility measurements for this family of compounds reveal a paramagnetic behaviour in a very wide temperature range. From experimental spectroscopic data as well as from a semi-empirical estimation (Simple Overlap Model SOM [5]) of the crystal-field parameters corresponding to the point site symmetry of the magnetically active Ln, Oh, and using the wavefunctions associated with the energy levels obtained, the paramagnetic susceptibility and its evolution vs temperature is simulated according to the van Vleck formalism. The observed deviation from the Curie¿Weiss behaviour at low temperature, very well reproduced in each case, reflects the splitting of the ground state of the corresponding Ln cation under the influence of the crystal field. Thus, magnetic frustration or cooperative interactions do not need to be considered to explain the mentioned low temperature deviation from the linearity of Curie-Weiss plots.
International
Si
Congress
7th International Conference on f Elements, ICfE 7
960
Place
Cologne, Germany
Reviewers
Si
ISBN/ISSN
978-3-941372-02-3
Start Date
23/08/2010
End Date
27/08/2010
From page
164
To page
164
Structural and magnetic properties of Sr2RSbO6 (R=rare earth)double perovskites
Participants
  • Autor: Francisco Fernandez Martinez (UPM)
  • Autor: Jose Luis Montero De Juan (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Caracterización óptica de materiales
  • Departamento: Química Industrial y Polímeros
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