Complex magnetic behaviour of Sr<sub>2</sub>CoNb<sub>1−x</sub>Ti<sub>x</sub>O<sub>6</sub>(0 ≤ x ≤ 0.5) as a result of a flexible microstructure

  1. Azcondo, María Teresa 12345
  2. Romero de Paz, Julio 4591011
  3. Boulahya, Khalid 45111213
  4. Ritter, Clemens 678
  5. García-Alvarado, Flaviano 12345
  6. Amador, Ulises 12345
  1. 1 Departamento de Química
  2. 2 Facultad de Farmacia
  3. 3 Universidad CEU San Pablo, Urb. Montepríncipe
  4. 4 Madrid
  5. 5 Spain
  6. 6 Institut Laue-Langevin
    info

    Institut Laue-Langevin

    Grenoble, Francia

    ROR https://ror.org/01xtjs520

  7. 7 BP 156-38042 Grenoble Cedex 9
  8. 8 France
  9. 9 CAI Técnicas Físicas
  10. 10 Facultad de Ciencias Físicas
  11. 11 Universidad Complutense de Madrid
    info

    Universidad Complutense de Madrid

    Madrid, España

    ROR 02p0gd045

  12. 12 Departamento de Química Inorgánica
  13. 13 Facultad de Ciencias Químicas
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Revista:
Dalton Transactions

ISSN: 1477-9226,  1477-9234

Año de publicación: 2015

Volumen: 44

Número: 8

Páginas: 3801-3810

Tipo: Artículo

DOI: 10.1039/C4DT03112A GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Dalton Transactions

Resumen

We report the rich magnetic behaviour of Sr2CoNb1−xTixO6 (0 ≤ x ≤ 0.5) oxides as a result of their complex microstructure. Although these oxides show an average simple-cubic perovskite structure, they present a flexible microstructure due to short-range ordering between Co/Ti and Nb cations in the perovskite B-sites. The microstructure consists of double-cubic perovskite domains grown in a simple-cubic perovskite matrix. The size and number of the double-cubic perovskite domains decrease as the Ti content increases. As a result of aliovalent substitution of Nb5+ by Ti4+ in the parent Sr2CoNbO6 mixed-valence Co3+/Co4+ oxides are obtained. A spin glass-like state has been observed at low temperatures for all the series, with freezing temperatures increasing with the Ti-content in the range 22 to 33 K. Furthermore, the x = 0.3 and x = 0.5 samples show non-interacting superparamagnetic particle-like dynamics associated with relatively high amounts of Co4+, with “blocking temperatures” of 13 and ∼16 K, respectively. The complex magnetic behaviour of the title oxides seems to be connected with the clustering of magnetic Co3+ and the distribution of Co4+ as a result of the microstructure.

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