Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Magnetic properties of Zn–Mg ferrite fine powders (abstract) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5435-5435 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Several fine powder samples of ZnxMg1−xFe2O4, 0≤x≤1, were prepared by the supercritical sol-gel (aerogel) process, and were annealed at 500 °C for 2 h. The structure, crystallite size and inversion parameter were determined by x-ray diffraction. The crystallite diameter of the as-prepared powders ranged from 6.5 to 8.5 nm. The minimum size was achieved for the samples with 0.25≤x≤0.50. After annealing the crystallite size increased by an average of 3 nm. The values of the inversion parameters, before and after annealing, reflect roughly the chemical preference of Zn cations to the tetrahedral sites and Mg cations to the octahedral sites of the spinel structure. However, these values indicate that the as-prepared materials were not in the equilibrium state. The magnetic properties were studied by 57Fe Mössbauer spectroscopy over a temperature range of 25 K to room temperature. Taking advantage of their sensitivity to the superparamagnetic behavior induced by the size effects, the Mössbauer spectra were used to determine the blocking temperatures. The calculated values peaked at x=0.50 for both the as-prepared and annealed powders. SQUID magnetometry measurements are currently underway. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362330
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Mössbauer spectrometry study of magnesioferrite particles (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 1135-1140 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fine particles of ferrimagnetic MgFe2O4 were synthesized through a sol-gel supercritical drying procedure, then cold-pressed and heated at 500 and 800 °C. These materials were characterized by Mössbauer spectrometry in the temperature range 25–298 K, and in the presence of a small applied magnetic field. The Mössbauer measurements show that heat treatment results in the formation of a small percentage of α-Fe2O3, an increase in the mean particle size and hyperfine magnetic field, and a decrease in the inversion parameter of the magnesioferrite. An average anisotropy constant equivalent to the bulk magnetocrystalline anisotropy is estimated for particles with diameter D=14 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357835
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Magnetic orientation of respirable asbestos fibers (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3214-3216 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Exposure to contaminated atmospheres is now strictly controlled and control limits have been delineated, giving maximum permissible concentrations of airborne fibers. These limits depend on the type of asbestos as well as concentration. Unfortunately, the current analytical technique cannot distinguish between different types of asbestos fibers or differentiate between asbestos and nonasbestos fibers of respirable size. In the current work orientations of amosite, chrysotile, and crocidolite have been measured as functions of magnetic field strength. Results show the family to have different orientation characteristics, and markedly different field strengths are required to align the various fibers. The results would indicate that a magnetic orientation technique can be used to distinguish between respirable asbestos and nonasbestos fibers and also to differentiate between the main types of asbestos fibers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338905
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Characterization of high-area Mg x Fe2O3+x (0 ⩽x ⩽ 2) mono-phasic powders by vibrational spectropies (1994)
    Springer
    Journal of materials science 13 (1994), S. 275-279 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00571775
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Formation of the K-state in a Ni-Fe-Mo-Cu alloy (1978)
    Springer
    Journal of materials science 13 (1978), S. 871-875 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The electrical resistivity, magnetic saturation and Vicker's hardness of the alloy 79wt% Ni-16wt% Fe-4.3wt% Mo-0.7 wt% Cu have been measured as a function of heat treatment in the range 300 to 500° C. These properties have also been measured on a binary 75 at. % Ni-25 at. % Fe alloy heat treated in the same temperature range so as to produce atomic order. An increase in resistivity in the quaternary alloy has been found and, by comparison with the binary alloy, this has been associated with short range atomic order.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00570526
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    The effects of magnetic quenching on glassy barium ferrite (1984)
    Springer
    Journal of materials science 19 (1984), S. 1277-1282 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Barium ferrite (BaFe12O19) prepared by solution evaporation techniques from ethylene glycol/citric acid or ethylene glycol/pyridine-1-oxide solutions is initially obtained in a glassy form. Although visual observations on samples heated to 1250° C showed that transparency was maintained in thin sections, X-ray powder diffraction studies showed the development of ordered regions of BaFe12O19. Prolonged heating at 1250° C resulted in a loss of visual transparency. Samples of partially amorphous material cooled rapidly in a weak magnetic field were found to have a magnetization considerably higher than samples cooled in the absence of a field. Samples rendered polycrystalline by heating for extended periods at 1250° C showed a lower magnetization on magnetic quenching.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01120039
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Temperature dependence of magnetic anisotropy (1975)
    Springer
    Journal of materials science 10 (1975), S. 1460-1462 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540841
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Effect of post sinter cooling rates on manganese zinc ferrites (1977)
    Springer
    Journal of materials science 12 (1977), S. 1490-1491 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540868
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...