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Peculiar structural effect of Sr2FeMoO6 perovskite type compounds

C. VALSANGIACOM1,* , C. PLAPCIANU1, L. STOICA2, G. ALDICA1, V. KUNCSER1

Affiliation

  1. National Institute of Materials Physics, Magurele - Bucharest, Romania
  2. University Politehnica of Bucharest, Faculty of Inorganic Chemistry, Romania

Abstract

Double perovskite Sr2FeMoO6 type compounds show special properties, such as magnetoresistance response at relatively small-applied fields and at rather high temperatures (ca. 400 K). Perovskite precursors were obtained unconventionally, in liquid phase, using oxalic acid as complexing agent, in the presence of ethylene glycol as polymerization agent. Ordering control concerning the magnetic properties is predictable to be strongly influenced by the synthesis route. The thermal stability of the precursors and the phase transitions of the oxide samples were analyzed by thermal analysis method, IR spectroscopy, Mossbauer spectroscopy, X-ray diffraction method and magnetic measurements. The experimental data for the perovskite compounds prepared by using oxalic acid as complexing agent revealed a double perovskite structure of analyzed samples, convenient magnetorezistive response (3.51 μB/f.u), in good agreement with the Mossbauer spectra. Moreover, Mossbauer spectreoscopy allows the distinction between the ordered and the disordered phases of the perovskite structure and put in evidence the strong dependence of the structural and magnetic characteristics of the double perovskites on the synthesis route..

Keywords

Complexion synthesis method, Double perovskites, Mössbauer effect.

Submitted at: Feb. 25, 2008
Accepted at: April 4, 2008

Citation

C. VALSANGIACOM, C. PLAPCIANU, L. STOICA, G. ALDICA, V. KUNCSER, Peculiar structural effect of Sr2FeMoO6 perovskite type compounds, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 4, pp. 845-848 (2008)