Nanocrystals of BaFe12O19 obtained by the proteic sol-gel process

被引：38
作者：
Fortes, S. S.
Duque, J. G. S.
Macedo, M. A. [1 ]
机构：
[1] Fed Univ Sergipe, Dept Phys, BR-49100000 Sao Cristovao, SE, Brazil
[2] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil
来源：
PHYSICA B-CONDENSED MATTER | 2006年 / 384卷 / 1-2期
关键词：
BaFe12O19; nanocrystals; proteic sol-gel process; coconut water;
D O I：
10.1016/j.physb.2006.05.158
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Nanocrystals of BaFe12O19, with a small amount of the BaFe2O4, were obtained by means of the proteic sol-gel process together. The results demonstrated that the magnetic and crystallographic properties are dependent on the calcination temperature and the values of M-r/M-s are very close to 0.5, which is the expected value by the Stoner-Wohlfarth model. The best calcination temperature was at 900 degrees C with M-s = 55.5 emu/g, H-c = 4.1 kOe and crystallite size 39 nm. (c) 2006 Elsevier B.V. All rights reserved.
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收藏
页码：88 / 90
页数：3
相关论文
共 14 条
[1]   Structural and magnetic properties of barium hexaferrite nanostructured particles prepared by the combustion method [J].
Castro, S ;
Gayoso, M ;
Rivas, J ;
Greneche, JM ;
Mira, J ;
Rodriguez, C .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1996, 152 (1-2) :61-69
[2]   Ultrafine ferrite particles prepared by coprecipitation/mechanical milling [J].
Ding, J ;
Liu, XY ;
Wang, J ;
Shi, Y .
MATERIALS LETTERS, 2000, 44 (01) :19-22
[3]   Magnetic and structural properties of CoFe2 O4 thin films synthesized via a sol-gel process [J].
Dos S Duque, J.G. ;
Macêdo, Ma. ;
Moreno, N.O. ;
Lopez, J.L. ;
Pfanes, H.-D. .
Journal of Magnetism and Magnetic Materials, 2001, 226-230 (PART II) :1424-1425
[4]   Evolution of the magnetic properties during the thermal treatment of barium hexaferrite precursors obtained by coprecipitation from barium ferrate (VI) solutions [J].
Jacobo, SE ;
Civale, L ;
Blesa, MA .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2003, 260 (1-2) :37-41
[5]   The effects of synthesis variables on the magnetic properties of coprecipitated barium ferrite powders [J].
Janasi, SR ;
Emura, M ;
Landgraf, FJG ;
Rodrigues, D .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2002, 238 (2-3) :168-172
[6]  
Macedo M., Patent Pending, Patent No. [0203876-5/BR, 02038765]
[7]   LixMn2O4 thin films characterization by X-ray, electrical conductivity and XANES [J].
Meneses, CT ;
Macedo, MA ;
Vicentin, FC .
MICROELECTRONICS JOURNAL, 2003, 34 (5-8) :561-563
[8]   Yttria thin films doped with rare earth for applications in radiation detectors and thermoluminescent dosimeters [J].
Montes, PJR ;
Valerio, MEG ;
Macêdo, MA ;
Cunha, F ;
Sasaki, JM .
MICROELECTRONICS JOURNAL, 2003, 34 (5-8) :557-559
[9]   BaFe12O19 thin film grown by an aqueous sol-gel process [J].
Santos, JVA ;
Macedo, MA ;
Cunha, F ;
Sasaki, JM ;
Duque, JGS .
MICROELECTRONICS JOURNAL, 2003, 34 (5-8) :565-567
[10]   Sonochemical approach to the preparation of barium hexaferrite nanoparticles [J].
Shafi, KVPM ;
Gedanken, A .
NANOSTRUCTURED MATERIALS, 1999, 12 (1-4) :29-34
12