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  • 1
    Electronic Resource
    Electronic Resource
    X-ray diffraction studies of the epitaxy of a/b-axes oriented YBa2Cu3O7−δ films grown by liquid phase epitaxy (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5243-5248 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A detailed x-ray diffraction study is reported for a/b-axes oriented YBa2Cu3O7−δ films obtained by the liquid phase epitaxy technique. The films were grown epitaxially in the tetragonal state on (110) NdGaO3 substrates so that [001]film(parallel) [110]subs and [100]film(parallel) [001]subs, 90°-[100]/[010] boundaries were almost absent. Below the tetragonal-to-orthorhombic transition temperature, the film undergoes intensive {hh0}-type twinning. The volume of the a-axis oriented material is similar to that of the b-axis oriented fraction and the presence of both orientations is likely to be controlled by {hh0}-type twinning. High temperature diffraction of the substrate indicates that nucleation of YBa2Cu3O7−δ on (110) NdGaO3 takes place on a square two-dimensional lattice and therefore the observed strong in-plane alignment is probably controlled by impurity action and/or surface relaxation rather than simple mismatch effects. The difference between the thermal expansion coefficients of the film and the substrate (αfilm[100], αfilm[010](approximately-greater-than)αsubs[001]) is compensated for upon cooling by a slight rotation (ε∼0.12°) of {hh0}-type domain boundaries around the common [001] direction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355722
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic study of M-type doped barium ferrite nanocrystalline powders (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 3333-3340 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the static magnetic properties of three different M-type doped barium ferrite compounds prepared by the glass crystallization method. The zero-field-cooled (ZFC) and field-cooled (FC) processes have been recorded at low field and they all show the typical features of a small particle system. The ZFC curves display a broad peak at a temperature TM, which depends on the distribution of particle volumes in the sample. Isothermal magnetization curves M(H) at several temperatures and saturation magnetization Ms as a function of temperature have been measured for the Co-Ti sample (BaFe10.4Co0.8Ti0.8O19). The dependence on temperature of the macroscopic magnetic parameters has been analyzed. The distribution of blocking temperatures is studied from the derivative of the remanent-to-saturation magnetization ratio with respect to temperature and it is fitted to a lognormal distribution, leading to a mean blocking temperature 〈TB〉=(81±40) K. The distribution of volumes of the magnetic unit is also obtained from this fitting. The dependence on temperature of the coercive field follows a Tk-law below 35 K. The value of the k exponent is discussed within the scope of two models: (i) the aligned case (k=0.5) and (ii) the random case (k=0.77).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354558
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  • 3
    Electronic Resource
    Electronic Resource
    Growth of crystals. Vol. 10 edited by N. N. Sheftal (1977)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 33 (1977), S. 1045-1045 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739477002496
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation and Characterization of Hexaferrite Powders (1991)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 58 (Jan. 1991), p. 129-148 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/58/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.58.129.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Melt textured YBCO: High trapped fields and superconducting magnetic bearings (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 1457-1462 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Bulk melt textured YBCO samples in the shape of discs were prepared by a top seeding method using Sm-123 crystals. The field distribution of the trapped field on the surface of the samples was measured at 77 K by means of a Hall probe. In single grains with diameter of 20 mm the trapped field reached maximum values up to 0.56 T at 77 K. Investigating the temperature dependence of the maximum trapped field, a value of 5.5 T at 30 K was found for the best sample. At the same temperature, degradation of the trapped field by a factor of about 10 was observed for a second sample after field cooling in a field of 7 T. This degradation is explained by damage to the sample due to magnetic stresses. At the centre of the sample a magnetic stress of 11 MPa is estimated to be responsible for this damage. Additionally YBCO material has been tested in a high speed motor with superconducting magnetic bearings (SMB) in order to demonstrate the passive stabilization properties of SMB. In first tests the shaft rotated with a speed of 12 000 rpm limited by air drag.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00753905
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  • 6
    Electronic Resource
    Electronic Resource
    Structural and magnetic properties of Ba-ferrite fine particles grown by glass crystallization (1991)
    Springer
    The European physical journal 19 (1991), S. 279-281 
    Details
    ISSN: 1434-6079
    Keywords: 75.60J ; 75.50G ; 75.30K
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The dependence of the specific saturation magnetization on the particle size of pure and Co-Ti-substituted Ba-ferrites was interpreted in terms of a nonmagnetic surface layer parallel to thec-planes of 1.3 nm and 0.7 nm, respectively, in thickness. Electron microscope investigations of the particles demonstrate that this effect arises neither from a sufficient fraction of superparamagnetic particles in the ensemble nor from the Co-Ti substitution or from surface defects such as steps and stacking disorder of the building blocks. Extrapolating this surface effect to small sizes yields a critical size, with the particles losing their ferrimagnetic behaviour. This critical size agrees surprisingly well with the volume calculated for the transition of the single domain state to the superparamagnetic one.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01448311
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