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.
引用
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
    Castro, S
    Gayoso, M
    Rivas, J
    Greneche, JM
    Mira, J
    Rodriguez, C
    [J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1996, 152 (1-2) : 61 - 69
  • [2] Ultrafine ferrite particles prepared by coprecipitation/mechanical milling
    Ding, J
    Liu, XY
    Wang, J
    Shi, Y
    [J]. MATERIALS LETTERS, 2000, 44 (01) : 19 - 22
  • [3] Magnetic and structural properties of CoFe2 O4 thin films synthesized via a sol-gel process
    Dos S Duque, J.G.
    Macêdo, Ma.
    Moreno, N.O.
    Lopez, J.L.
    Pfanes, H.-D.
    [J]. 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
    Jacobo, SE
    Civale, L
    Blesa, MA
    [J]. 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
    Janasi, SR
    Emura, M
    Landgraf, FJG
    Rodrigues, D
    [J]. 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
    Meneses, CT
    Macedo, MA
    Vicentin, FC
    [J]. MICROELECTRONICS JOURNAL, 2003, 34 (5-8) : 561 - 563
  • [8] Yttria thin films doped with rare earth for applications in radiation detectors and thermoluminescent dosimeters
    Montes, PJR
    Valerio, MEG
    Macêdo, MA
    Cunha, F
    Sasaki, JM
    [J]. MICROELECTRONICS JOURNAL, 2003, 34 (5-8) : 557 - 559
  • [9] BaFe12O19 thin film grown by an aqueous sol-gel process
    Santos, JVA
    Macedo, MA
    Cunha, F
    Sasaki, JM
    Duque, JGS
    [J]. MICROELECTRONICS JOURNAL, 2003, 34 (5-8) : 565 - 567
  • [10] Sonochemical approach to the preparation of barium hexaferrite nanoparticles
    Shafi, KVPM
    Gedanken, A
    [J]. NANOSTRUCTURED MATERIALS, 1999, 12 (1-4): : 29 - 34
12