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  • Springer  (257)
  • American Institute of Physics (AIP)  (38)
  • 1990-1994  (295)
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  • 1
    Electronic Resource
    Electronic Resource
    Positive temperature coefficient of resistance effect in hot-pressed cristobalite-silicon carbide composites (1994)
    Springer
    Journal of materials science 29 (1994), S. 1097-1100 
    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 Conductive silicon carbide particles were incorporated into an insulating cristobalite ceramic matrix to produce composite materials with a sizeable positive temperature coefficient (PTC) effect. A large drop in resistivity with silicon carbide content at room temperature, or percolation behaviour, was observed. The PTC effect of the composites, which resulted from the thermal expansion of the cristobalite ceramic matrix, was a maximum with five orders of magnitude for the specimen with 25 vol% silicon carbide. The PTC transition temperature of the composites was at 260 °C, which coincided exactly the reversible high-low phase inversion temperature of the cristobalite ceramic matrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351437
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  • 2
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    Positive temperature coefficient of resistance effect in hot-pressed cristobalite-silicon carbide composites (1994)
    Springer
    Details
    Publication Date: 1994-02-01
    Print ISSN: 0022-2461
    Electronic ISSN: 1573-4803
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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    PAPER CURRENT
  • 3
    Electronic Resource
    Electronic Resource
    Monte Carlo simulation of magnetobirefringence in magnetic fluids : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6142-6144 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: On the basis of the consideration that the magnetic-field-induced optical anisotropy is caused by the combined effects of field-induced orientation of shape-anisotropic scatterers and the chain-like aggregation of magnetic particles in external magnetic field, a unified mathematical expression is established and Monte Carlo technique is implemented to simulate the field dependence of magnetobirefringence. Compared with the previous models, this method is more effective in exposing the micro-origin of the phenomena and can be easily extended to calculate other aspects of the effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352728
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic properties of ultrafine nickel particles : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5903-5905 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ultrafine nickel particles have intriguing physical and chemical properties, which are interesting both in fundamental and applied research. The size of the particle was controlled by gas pressure. X-ray diffraction studies showed that fine Ni particles have fcc crystal structure and are coated with thin Ni oxide on the surface. Electron micrographs showed a spherical particle shape, forming a long chain. Size dependence of magnetic properties were studied. The specific magnetic moment drastically decreases when reducing the diameter d of particles 〈15 nm. The coercivity Hc also approaches zero when d is about 15 nm. Therefore, we can suppose that the critical size for superparamagnetism at room temperature is about 15 nm. According to the superparamagnetic formula KV=25 kT, the value of the magnetic anisotropy constant can be determined, K = −5.8 × 105 (erg/cc). It is found to be larger than bulk Ni [K=−3.4–5.1 × 104 (erg/cc)], the same as Fe particles. The maximum of coercivity at room temperature is about 250 Oe, that is less than the theory value for the coherent rotation model, Hc = 4 K/3Ms=1600 Oe. The mechanism of reversal magnetization can be understood by the sphere chain model. The critical diameter of the single domain is about 65 nm. Curie temperature Tc obviously decreases for 9-nm average diameter particles rather than bulk. It may be in connection with the lattice contraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350101
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  • 5
    Electronic Resource
    Electronic Resource
    Coupling-loss-arrested misaligned semiconductor laser arrays (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 3756-3758 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Coupling-loss-arrested misaligned semiconductor laser arrays are designed and fabricated by liquid-phase epitaxy. In these devices, the losses in the normal misaligned arrays is collected by a gain-induced positive waveguide, and then the collected light couples with light in the adjacent waveguides evanescently, therefore avoiding the coupling loss and strengthening the coupling. The constructed co-cavity element should have better characteristics with respect to transverse-mode selection. A clean single-lobe far field as narrow as 3° and a relatively low threshold of 130 mA for a seven-element array are obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346294
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  • 6
    Electronic Resource
    Electronic Resource
    Theoretical critical-state susceptibility spectra and their application to high-Tc superconductors (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5463-5477 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The fundamental complex susceptibilities χ=χ'−jχ‘ are calculated from the symmetric critical-state hysteresis loops M(H) for an infinitely long hard superconductor with a rectangular cross section 2a×2b (a≤b). For the critical-state model, the Bean, the Kim, the exponential law, and the triangular-pulse local-internal-field-dependent critical-current densities Jc(Hi) are chosen. The results of χ' and χ‘ are given as functions of the field amplitude Hm normalized to the full-penetration field Hp, the sample dimensional ratio a/b, and the p parameter that characterizes the Hi nonuniformity in the sample at H = Hp on the initial M(H) curve. χ‘(−χ') curves are also given for the different functional Jc(Hi) and other conditions. These theoretical critical-state susceptibilities are particularly useful in the study of sintered high-Tc superconductors. For these materials, the procedures to determine the effective grain volume fraction f*g and the averaged and the local intergranular critical-current densities 〈Jc〉acs and Jc(Hi) by means of ac susceptibility measurements using such theoretical critical-state-susceptibility functions are described. Related problems met in the high-Tc superconductor study such as sample performance nonuniformity, frequency dependence, grain clusters, and susceptibilities for the grains are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350204
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  • 7
    Electronic Resource
    Electronic Resource
    Wavelength dependence of the Faraday effect and magnetobirefringence in ferrofluid thin films : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6139-6141 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An enhancement of negative Faraday rotation in a dilute ferrofluid was reported near the wavelength of 0.5 μm by Yusuf. The observed phenomenon was explained in terms of a "small particle resonance.'' The premise of the above explanation is debatable. In order to give a more detailed explanation, measurements of Faraday rotation and magnetobirefringence spectra in dense ferrofluid thin films are reported from 0.5 to 2.7 μm, and a mathematical model is derived taking into account a skew-symmetric dielectric tensor for ferrite particles. The experiments confirm that the negative Faraday rotation is predominantly caused by the wavelength dependence of the off-diagonal elements εfxy(λ) of the dielectric tensor of the magnetic particles themselves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352727
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  • 8
    Electronic Resource
    Electronic Resource
    Anomalous charge transport phenomena in molecular-based magnet V(TCNE)x⋅y(solvent) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6566-6568 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present charge transport studies on recently developed molecular-based magnets V(TCNE)x⋅y(solvent) (TCNE=tetracyanoethylene) which show local magnetic ordering at temperatures, T, as high as 400 K. V(TCNE)x⋅y(solvent) prepared from the solvent CH2Cl2 has σ(300 K)∼10−3 S/cm, and that prepared from the solvent CH3CN has σ(300 K)∼10−5 S/cm. The σ(T) of both materials follows the Mott 3D variable range hopping [log(T1/2σ)∝T−1/4] behavior. An anomalously strong T-dependent ac conductivity is likely caused by the short-range ferrimagnetic correlations. Cole–Cole analysis of the ac complex dielectric constant suggests there are two relaxation mechanisms, with an Arrhenius relation fitted to both. The microwave frequency response is consistent with audio frequency data and yields a localization length of ∼ 5 A(ring), comparable with the dimensions of a [TCNE]−. group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352565
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  • 9
    Electronic Resource
    Electronic Resource
    Transmission electron microscopy study of N+-implanted silicon on insulator by energy-filtered imaging (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 1850-1852 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the first study of N+-implanted silicon on insulator by energy-filtered imaging using an Opton electron microscope CEM 902 equipped Castaing–Henry electron optical system as a spectrometer. The inelastic images, energy window set at ΔE=16 eV and ΔE=25 eV according to plasmon energy loss of crystal Si and of silicon nitride respectively, give much structure information. The interface between the top silicon layer and the upper silicon nitride layer can be separated into two sublayers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349503
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  • 10
    Electronic Resource
    Electronic Resource
    Structural and superconducting properties of Bi-Sr-Ca-Cu superconductors studied by Fe doping (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4512-4514 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 1.5% of Fe has been substituted for Cu in several "2212'' and "2223'' Bi-Sr-Ca-Cu superconductors. All of the samples show a reduction of Tc by about 13 K due to the Fe impurities. Mössbauer measurements at room temperature reveal structural characteristics such as stacking faults and intergrowth of different phases in these Bi-based compounds on the microscopic scale. The suppression of Tc due to Fe doping in the Bi "2212'' or " 2223'' system is comparable to that of the "123'' system, but much smaller than that of the "214'' system. The interplanar correlation existing in the "123'' and the Bi "2212'' and "2223''systems seems to play an important role in sustaining the high-temperature superconductivity and weakening the detrimental effect of impurity elements on superconductivity in these two systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344880
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