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Crystalline structure, transport and magnetic properties of Sr2FexNi1-xMoO6 compounds

M.–L. CRAUS1,2, L. BÎLTEANU1,3, C. NECULIŢA4, M. LOZOVAN2,*

Affiliation

  1. LNF – JINR, Dubna Russia, Joliot-Curie 6, 141980 Dubna, Mosk.Obl, Russia
  2. National Institute of R & D for Technical Physics, 47 D. Mangeron Blvd., 700050 Iasi, Romania
  3. Faculty of Physics, University of Bucharest, 405 Fizicienilor Street, RO 077125 Bucharest-Mǎgurele, Romania
  4. Faculty of Physics,”Al. I. Cuza” University, 11 Carol I Blvd., RO 700506 Iasi, Romania

Abstract

We sintered Sr2FexNi1-xMoO6 perovskites by means of improved ceramic technology, adding a specific reduction agent, between 1100 ÷ 1200°C in air. Some test treatments were performed in O2 or vacuum. The sintered/treated samples were investigated by means of XRD by using a DRON 2.0 diffractometer, with an acquisition data system. The magnetic measurements were performed between 77 and 600 K by using a Foner-type magnetometer. In the same range of temperatures we made the transport measurements. The XRD data were handled with DICVOL©/Check Cell©/Powder© programs. The structure of the sintered sample in the presence of the reduction agent is different relatively to those treated in H2 + Ar atmosphere samples with the same chemical composition. The test performed by means of FullProf© program indicated a smaller oxygen concentration, as comparing with the stoechiometric double perovskites, which leads to a change of the compounds crystalline symmetry. All sintered phases have the same structure characterized by the GS 117 (P4b2). The volume of the unit cell and the lattice constants increases with the Fe concentration in the sample. Large values of magnetoresistance were observed near room temperature..

Keywords

Double perovskites, Extrinsic magnetoresistance, Crystalline structure, Transport phenomena.

Submitted at: Sept. 5, 2006
Accepted at: Sept. 13, 2006

Citation

M.–L. CRAUS, L. BÎLTEANU, C. NECULIŢA, M. LOZOVAN, Crystalline structure, transport and magnetic properties of Sr2FexNi1-xMoO6 compounds, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 5, pp. 1720-1722 (2006)