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  • 1
    Electronic Resource
    Electronic Resource
    Enhanced band-gap blueshift due to group V intermixing in InGaAsP multiple quantum well laser structures induced by low temperature grown InP (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 3199-3201 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photoluminescence and cross-sectional transmission electron microscopy, combined with x-ray compositional analysis, have been used to study quantum well intermixing in an InGaAsP quantum well laser structure. Quantum well intermixing is induced by capping the samples with a layer of InP grown at low temperature (300 °C) and subjecting them to rapid thermal anneal treatments in the temperature range 600–800 °C. The presence of the low temperature InP layer, which contains an abundance of nonequilibrium point defects, significantly enhances the intermixing on annealing, producing a large band-gap blueshift. The microscopy results show good broadening with smeared interfaces, and the compositional analysis suggests this can be attributed to the intermixing of group V atoms. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1374231
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  • 2
    Electronic Resource
    Electronic Resource
    Soundspeed measurements in vapor-liquid mixtures behind shock waves (1986)
    Springer
    Experiments in fluids 4 (1986), S. 279-282 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In the experimental investigation of liquefaction shock waves, it is possible to measure the soundspeed of the two-phase, liquid-vapor mixture behind the shock wave. The expansion wave, produced as the shock wave emerges from the open end of a shock tube, intersects the shockfront at an observable point, allowing a simple Mach construction for the determination of the mixture soundspeed. Photographic observation and measurements of fluid properties and shock velocity are required. Results are compared with the mixture soundspeeds calculated for local thermodynamic equilibrium. Departures from the equilibrium values increase as shock strength increases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369120
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  • 3
    Electronic Resource
    Electronic Resource
    Sol-Gel Thin Films of BaFe12O19 from Chemically Modified Alkoxide Precursors (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 941-946 
    Details
    ISSN: 1573-4846
    Keywords: magnetic films ; ferrite ; sol-gel method ; alkoxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Homogeneous BaFe12O19 (BaM) thin films have been prepared by the dip-coating technique on microscope slides and SiO2 wafers using barium and iron alkoxides as precursors, and diethanolamine as a modifier. In order to optimise the coating conditions, the influence of the alkoxide, water and modifier on the sol viscosity, thickness and appearance of the Fe2O3 films has been investigated. For comparison of the crystallisation and magnetic properties, powders of the same composition as the films have been also prepared by the sol-gel method. The BaM phase appears after annealing at 650°C for 6 hours. The BaM film and powder, heated at 850°C for 6 hours, give coercive force of about 3000 and 5500 Oe, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018393115177
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  • 4
    Electronic Resource
    Electronic Resource
    Sol-gel thin films of BaFe12O19 from chemically modified alkoxide precursors (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 941-946 
    Details
    ISSN: 1573-4846
    Keywords: magnetic films ; ferrite ; sol-gel method ; alkoxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Homogeneous BaFe12O19 (BaM) thin films have been prepared by the dip-coating technique on microscope slides and SiO2 wafers using barium and iron alkoxides as precursors, and diethanolamine as a modifier. In order to optimise the coating conditions, the influence of the alkoxide, water and modifier on the sol viscosity, thickness and appearance of the Fe2O3 films has been investigated. For comparison of the crystallisation and magnetic properties, powders of the same composition as the films have been also prepared by the sol-gel method. The BaM phase appears after annealing at 650°C for 6 hours. The BaM film and powder, heated at 850°C for 6 hours, give coercive force of about 3000 and 5500 Oe, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436965
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  • 5
    Electronic Resource
    Electronic Resource
    Magneto-optical characteristics of Co, Ti-substituted barium hexaferrite films deposited by the dip-coating method (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 947-951 
    Details
    ISSN: 1573-4846
    Keywords: hexagonal ferrites ; thin films ; sol-gel ; magneto-optics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Pure and Co, Ti-substituted hexagonal barium ferrite (BaFe12O19, BaM) films were prepared by the dip-coating method from alkoxides. After repeated dipping, drying and calcining at 500°C for about 15 minutes in an oxygen atmosphere, polycrystalline films with a thickness of 1–1.8 μm on SiO2 substrates were obtained. Spectral dependencies of the Faraday rotation and the optical transmission of BaCo x Ti x Fe12−2x O19(0≤x≤0.8) films were measured in the range from 500 to 2500 nm at room temperature. The absorption coefficient did not display much structure, but specific Faraday rotation spectra of Co, Ti-ferrite films showed local maxima at 720, 1475 and 1750 nm. At those wavelengths, the magneto-optical figure of merit attains its maximum values. For comparison of the crystallization and magnetic properties, Ba(CoTi) x Fe12−2x O19 (x=0.9) powder has also been prepared by the sol-gel method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436966
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  • 6
    Electronic Resource
    Electronic Resource
    Spectra and decay of triplet states of aromatics in benzene solutions (1986)
    Springer
    Journal of radioanalytical and nuclear chemistry 101 (1986), S. 369-375 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The triplet-triplet absorption spectra of various aromatic compounds in benzene solution were studied by pulse radiolysis. It has been found that methylation of naphthalene characteristic absorption band in this group of compounds at 430±10 nm (naphthalene, 2-methylnaphthalene, 2,6-dimethylaphthalene, anthracene, phenanthrene, pyrene and fluorene); new bands appeared with phenanthrene and pyrene at 495 and 525 nm respectively. The decay remains of the first order in the whole group with similar rate constant values. Diphenyl and 1,1-dinaphthyl show significant changes in their T-T spectra in comparison with the preceding group of compounds. T-T spectrum of o-terphenyl differs significanly from those of p-and m-isomers, which can be caused by greater overlapping of electron orbitals in o-isomer molecule. Aromatic ketones show a complex picture both in spectra and decay kinetics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02042438
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