Results 161 to 170 of about 3,070 (205)
Some of the next articles are maybe not open access.
Ferromagnetic resonance in hexaferrite nanopowders
Russian Physics Journal, 2008Results 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
openaire +1 more source
High coercivity Sr hexaferrites
Journal of Magnetism and Magnetic Materials, 1991Abstract The improvement of the microstructure of Sr hexaferrites and consequently their magnetic properties were studied. The aim of the study was to attain a fine grained microstructure by using controlled grain growth. The most important part of the sintering process is the rearrangement of fine ferrite particles in the presence of the liquid ...
Spomenka Beseničar, Miha Drofenik
openaire +1 more source
On the implantability of barium hexaferrite magnets
Clinical Materials, 1986The purpose of this study was to determine the suitability of using small barium hexaferrite magnets in implantable devices for the purpose of locating their exact position beneath the skin. From animal tests it is concluded that such magnets are a good method for locating implants, and that when properly prepared and encapsulated in silicone rubber ...
MD Craggs, PEK Donaldson, P Luthert
openaire +1 more source
Mechanical properties of barium hexaferrites
IEEE Transactions on Magnetics, 1979The 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 +3 more
openaire +3 more sources
Kinetics of Strontium Hexaferrite Formation
Transactions of the Indian Ceramic Society, 1981Kinetics 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
openaire +1 more source
Influence of stoichiometry on hexaferrite structure
Journal of Magnetism and Magnetic Materials, 1996Abstract Barium hexaferrite particles prepared by several techniques yield best magnetic characteristics if a certain barium surplus is used. In the case of unsubstituted sol-gel-derived barium hexaferrites, highest values of the specific saturation magnetization occur in powders with n = Fe 2 O 3 /BaO = 5.25 in the starting composition.
C. Sürig, K.A. Hempel, Ch. Sauer
openaire +1 more source
Exchange interactions in barium hexaferrite
Physical Review B, 2005The 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
openaire +1 more source
Lanthanum-substituted barium hexaferrites
Soviet Powder Metallurgy and Metal Ceramics, 1971A study was made of the effect of lanthanum oxide on the properties of barium hexaferrites. It is shown that, by introducing small quantities of lanthanum oxide, it is possible to produce a material with (BH)max of 0.9 · 106 G-Oe, which is practically unaffected by sintering temperature.
I. N. Frantsevich, L. N. Tul'chinskii
openaire +1 more source
Hydrothermal synthesis of barium hexaferrite
High Pressure Research, 2001Abstract 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 +3 more
openaire +1 more source
Remanence properties of barium hexaferrite
Journal of Alloys and Compounds, 2004Abstract Barium hexaferrites have been widely used as permanent magnets, however one of the most important parameters that characterizes these ferrites is the switching field distribution (SFD). This work calculates the SFD on a small particle barium ferrite (BaFe 12 O 19 ) obtained by coprecipitation from chlorides in an alkaline medium using the ...
openaire +1 more source