Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 120, Issue 1, Pages 213-216Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2009.10.048
Keywords
M-Sr ferrite; Hollow fibers; Magnetic property; Shape anisotropy
Categories
Funding
- National Natural Science Foundation of China [50674048, 50474038]
- China Postdoctoral Science Foundation [20080431069]
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The M-Sr ferrite hollow fibers have been successfully prepared by the organic gel-precursor transformation process. The phase formation process of M-Sr ferrite is analyzed by FTIR, XRD and consists of the gel-precursor thermal decomposition and the subsequent ferrite phase formation from strontium oxide and iron oxide. The M-Sr ferrite hollow fibers obtained are characterized with SEM and XRD, and show a high aspect ratio, fine diameters around 4 mu m and a ratio of the hollow diameter to the fiber diameter being about 1/2. The optimized M-Sr ferrite hollow fibers are composed of nanograins with a hexagonal plate morphology. Magnetic properties are measured with VSM under a maximum applied of 1194 kA m(-1). The M-Sr ferrite hollow fibers formed at 1100 degrees C for 2 h with the specific saturation magnetization of 53.5 A m(2) kg(-1) possess a shape anisotropy characteristic and the coercivity for the aligned hollow fibers parallel and perpendicular to the applied field is correspondingly 385 and 357 kA m-1. (C) 2009 Elsevier B.V. All rights reserved.
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