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Revista de Chimie (Rev. Chim.), Year 2010, Volume 61, Issue 4,





Ioana Aurelia Gorodea, Elena Adriana Perianu, Alexandra Raluca Iordan, Mircea Nicolae Palamaru
Structural, Electrical and Magnetic Characterization
of the Double Perovskites Sr2Cr(1+x)W(1-x)O6

Abstract:

We report on the preparation and characterization of the double perovskite compounds Sr2Cr1+xW1-xO6 (x = 0 ÷ 0.5) with a Curie temperature near 300 K. We have prepared our samples by solid state reaction. The mixtures were calcined at 950oC for 20 h in a 5%H2/N2 gas mixture and then pressed into pellet and sintered at 1100-1580oC in a 5%H2/N2 gas mixture. The samples were characterized by X-ray diffraction, electronic microscopy (SEM), transport and magnetic measurements. The diffraction patterns were indexed on a cubic Fm3m lattice of the double perovskite structure. Electron microscopy show that the samples have grain size between 0.1 and 0.2 µm. Transport properties for all samples shows an increase of the resistivity with decreasing temperature. The compounds are ferrimagnetics and the magnetoresistance regularly increases as temperature diminishes. Our results show that Sr2CrWO6 is an interesting candidate for room temperature magnetoelectronic materials. Keywords: solid-state synthesis, double perovskite, X-ray diffraction, SEM, magnetoresistance


Issue: 2010, Volume 61, Issue 4
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