期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 263, 期 3, 页码 282-288出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0304-8853(02)01576-7
关键词
chemical synthesis; crystal structure and symmetry; magnetoresistance; electronic transport
We report the synthesis of the Ruddlesden-Popper material Sr3Fe1.5Co0.5O6.67 (a compound usually obtained under high-pressure conditions) by a simpler normal pressure liquid-mix method and its structural characterization by means of X-ray powder diffraction. In this material-which is semiconducting and shows a glassy magnetic behavior-the combination of the reduced dimensionality of the structure compared to 3D perovskites, the small grain size obtained by our synthesis method and the selected stoichiometry, results in a record magneto resistance in these kind of compounds, -47% at T = 5 K and H = 50 kOe, that is explained on the basis of intragranular and intergranular effects. (C) 2003 Elsevier Science B.V. All rights reserved.
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