Results 131 to 140 of about 358 (158)

Magnetoelectric Hexaferrites

Annual Review of Condensed Matter Physics, 2012
Magnetoelectric (ME) multiferroics are materials that combine coupled electric and magnetic dipoles. Studies of ME multiferroics are a time-honored research subject because of their potential for future electronic devices. Recent discoveries have revealed that ferroelectricity can be induced by complex internal arrangements of magnetic moments.
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Exchange interactions in barium hexaferrite

Physical Review B, 2005
The electronic structure of $\mathrm{Ba}{\mathrm{Fe}}_{12}{\mathrm{O}}_{19}$ hexaferrite is calculated using the density functional theory and generalized gradient approximation (GGA). The $\mathrm{GGA}+\mathrm{U}$ method is used to improve the description of strongly correlated $3d$ electrons of Fe.
P. Novák, J. Rusz
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Kinetics of Strontium Hexaferrite Formation

Transactions of the Indian Ceramic Society, 1981
Kinetics of strontium hexaferrite (SrO. 6Fe2O3) formation from SrCO3 and Fe2O3 under isothermal conditions were studied by quantitative X-ray diffractometry at reaction temperatures of 745°, 895°, 950°, 984° and 1050°C for various reaction times from 2 minutes to 30 hours. At 745°C, two intermediates, 2SrO.
I. K. Naik, A. R. Das
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Formation of U-type hexaferrites

Journal of Materials Research, 2004
The formation of U-type hexaferrites with the composition Ba4B2Fe36O60 (B = Co, Ni, Zn) was studied. Samples were characterized by means of x-ray diffraction, electron microscopy (with energy-dispersive spectroscopy), and thermogravimetric and thermomagnetic analyses.
Darja Lisjak, Darko Makovec, Miha Drofenik   +2 more
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Mechanical properties of barium hexaferrites

IEEE Transactions on Magnetics, 1979
The mechanical properties of typical isotropic barium ferrites have been determined. A statistical analysis has shown that fracture toughness is the best quality parameter. It changes with variation of production operation conditions. The fracture statistics follows the Weibull distribution. A relationship is found between the influence of the Fe 2 O 3
CAVALLOTI P, ROBERTI, Roberto, CARTOCETI A, SCANSETTI F.   +3 more
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GeMn-substituted barium hexaferrite

2002 3rd International Conference on Microwave and Millimeter Wave Technology, 2002. Proceedings. ICMMT 2002., 2003
The microwave properties have been studied on polycrystalline hexaferrite BaZn/sub 2/(GeMn)/sub 0.2/Fe/sub 15.6/O/sub 27/. The X-ray diffraction has shown that the W-type hexaferrites BaZn/sub 2/(GeMn)/sub x/Fe/sub 16-2x/O/sub 27/ can not be formed at x/spl ges/0.5.
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Ferromagnetic resonance in hexaferrite nanopowders

Russian Physics Journal, 2008
Results obtained from experimental investigations into the effect of mechanical activation of a BaCoxTixFe12−2xO19 hexaferrite system (x = 1 and 1.2) with a low anisotropy field in a high-energy planetary mill on the structure and magnetic parameters of the powders are presented.
V. A. Zhuravlev, E. P. Naiden
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Hydrothermal synthesis of barium hexaferrite

High Pressure Research, 2001
Abstract The authors of the report carried out synthesis of barium hexaferrite (BHF) both in water vapor atmosphere and in liquid medium in the temperature range 200-400°C at pressures PH2O of 9-26MPa in laboratory autoclaves. The results of research have shown that BHF with the best performances can be obtained by thermovaporous treatment of dry ...
M. N. Danchevskaya, Yu. D. Ivakin, L. F. Martynova, G. P. Muravieva   +3 more
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Microwave Sintering of Baryum Hexaferrite

MRS Proceedings, 1994
ABSTRACTConventional sintering of baryum hexaferrite Co2Z leads to a mixture of phases with a low density. In this paper we try to obtain a pure densified CO2Z hexaferrite by microwave heating. The design of the applicator is computed from both the electromagnetic physical characteristics, the dimensions and the shape of the hexaferrite sample.
D. Rousselle, D. Autissier, B. Guillou, J. Leclerc   +3 more
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Highly Oriented SrM Tape Hexaferrite

IEEE Transactions on Magnetics, 2006
This paper reports on preparation of a magnetically anisotropic polycrystalline hexaferrite, Sr0.95Ca0.05Fe12O19, whose orientation degree is as high as 100%. The preparation uses standard ceramic techniques, including wet pressing and flowing-oxygen sintering.
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