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  • 1
    Electronic Resource
    Electronic Resource
    The molecular structure of tetrafluoro-1,3-dithietane as determined by electron diffraction (1977)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 81 (1977), S. 1682-1683 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100532a016
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  • 2
    Electronic Resource
    Electronic Resource
    A new method for synthesizing nanocrystalline alloys (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 522-524 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new method to prepare nanocrystalline alloys was developed by means of crystallization from amorphous alloys. By using this method, a Ni-P alloy with 9 nm crystallites was synthesized. The structures and grain sizes of the alloy were examined by means of x-ray diffraction, transmission electron microscopy, and high resolution electron microscopy. Specific heat capacity and thermal expansion coefficient of the nanocrystalline Ni-P alloy prepared by this method were found to be greater than those of the coarse-grained crystalline alloy by 12.3% and 56.2%, respectively. A new micromechanism for nanometer-sized crystallites formation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347698
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  • 3
    Electronic Resource
    Electronic Resource
    Investigation of the interfacial defects in a nanocrystalline Ni-P alloy by positron annihilation spectroscopy (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4451-4453 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A nanocrystalline Ni-P alloy prepared by the crystallization method has been studied by using positron lifetime spectroscopy. The lifetime results and the corresponding interfacial defects in the sample are discussed in comparison with those of the nanocrystalline iron materials prepared by compacting ultrafine powders.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348377
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  • 4
    Electronic Resource
    Electronic Resource
    Investigations on nanocrystalline Fe78B13Si9 alloys by positron annihilation spectroscopy (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 5124-5129 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Polycrystalline Fe78B13Si9 alloys with nanoscale grain sizes prepared by the crystallization method have been studied by positron lifetime and Doppler-broadened line-shape measurements. The results obtained are different from those on amorphous or coarse-grained crystalline alloys with the same composition. When the grain sizes are clearly smaller than the mean positron diffusion length (L+(approximately-equal-to)100 nm), saturation trapping and annihilation of the positrons in the samples should occur at traps within the interfaces. There are two kinds of defects in the interfaces of the nanocrystalline FeBSi alloys, i.e., the free volumes (the size of which is slightly smaller than that of the amorphous counterpart) and the microvoids. The dependence of grain sizes on the type of interface defects and structure-sensitive properties has also been studied by positron spectroscopy. The measurements and comparison of the mean positron lifetime τ¯ and the Doppler parameter S on the nanocrystalline, amorphous, and coarse-grained crystalline alloys have given a satisfactory explanation for the relationship between the structure-sensitive properties, grain sizes, and crystalline states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352042
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  • 5
    Electronic Resource
    Electronic Resource
    Grain growth kinetics and interfacial energies in nanocrystalline Ni-P alloys (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 7345-7347 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Grain growth process in nanocrystalline Ni-P alloys was investigated by use of differential scanning calorimetry and x-ray diffraction. Two exothermal peaks which result from grain growth processes of Ni3P and Ni crystallites, respectively, have been detected upon heating the nanocrystalline samples at constant heating rates. Activation energies for the two processes of grain growth were calculated by means of the relationship of grain growth temperature and heating rate using the Kissinger equation. Average interfacial energies of Ni3P/Ni3P grain boundary and Ni3P/Ni boundary were determined from the heat released during grain growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347591
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  • 6
    Electronic Resource
    Electronic Resource
    Spectroscopic properties of Yb-doped silica glass (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 576-581 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have carried out a systematic study of optical emission in Yb-doped fiber glass materials which can be used for fiber laser applications. The stimulated emission crosssections of these materials have been calculated. The wavelength dependence of emission of these materials has been studied. The peak emission cross section in Yb-doped silica glass is 2.6 pm2 and the peak wavelength is at 974 nm. The codopants do not significantly alter the emission cross section or the peak wavelength of this cross section.© 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1425445
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  • 7
    Electronic Resource
    Electronic Resource
    Spectroscopic properties of Nd-doped glass for 944 nm laser emission (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 3079-3083 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A tunable laser operating near 944 nm is important for the detection of water vapor in the atmosphere. In this work, we have carried out a systematic study of Nd doped fiber glass materials which can be used for this purpose. The emission cross sections of these materials at 944 nm have been calculated. The wavelength dependence of emission of these materials has been studied. Among the silica-based materials Nd doped silica fiber glass has the largest cross section for 944 nm laser emission. The codopants reduce this cross section. Some Nd doped nonsilica materials such as Ba0.25Mg0.75Y2Ge2O12 and chloride glass have higher stimulated emission cross section than silica-based materials. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1347953
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  • 8
    Electronic Resource
    Electronic Resource
    Grain growth and strain release in nanocrystalline copper (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 6408-6414 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Grain growth and strain release processes in the electrodeposited nanocrystalline (nc) Cu specimen with a high purity were investigated by means of differential scanning calorimetry, x-ray diffraction, electrical resistance measurement, and high-resolution transmission electron microscopy. It was found that for the as-deposited nc Cu, the grain growth started at about 75 °C, at which the microstrain in (111) plane (e111) began to release, while the mean microstrain and that in (100) plane (e100) began to release at a higher temperature (150 °C). With an increment in microstrain in the nc Cu introduced by cold rolling, the grain growth onset temperature increased while the strain release onset temperature dropped obviously. These results showed an evident correlation between the grain size stability and the microstrain in the nc materials. The activation energy for the grain growth was determined by using Kissinger analysis and isothermal kinetics analysis, being about 86 kJ/mol, implying that the grain growth process is dominated by grain boundary diffusion. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1367401
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  • 9
    Electronic Resource
    Electronic Resource
    Transmittance in irradiated poly(methyl methacrylate) at elevated temperatures (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 5022-5027 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The transient transmittance of gamma-ray irradiated poly(methyl methacrylate) at elevated temperatures is investigated. The transmittance in the ultraviolet and visible range decreases with an increase of radiation dose. We propose that the color center is responsible for the reduction of transmittance in the irradiated specimen. Then the concentration of the color center decreases with increasing annealing time at elevated temperatures. The transmittance data at 407 nm are in excellent agreement with the theoretical model in which the color center is annihilated by a second order kinetic process. The rate constant follows the Arrhenius equation. The activation energy in the range of 44.27–51.52 kJ/mol decreases with increased dose. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1316792
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  • 10
    Electronic Resource
    Electronic Resource
    Hall–Petch relationship in the nanocrystalline selenium prepared by crystallization from the amorphous state (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 2811-2813 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Bulk nanocrystalline selenium (nc-Se) specimens with various grain sizes were prepared by isothermally crystallizing as-quenched amorphous selenium. Microhardness measurements indicated that with a decrease in grain size, from 25 to 9 nm, hardnesses of nc-Se samples increase dramatically from 0.34 to 0.98 GPa, i.e., a normal Hall–Petch relationship is obtainable over the grain size range studied for nc-Se samples. Structural characterization of nc-Se using x-ray diffraction revealed an evident lattice distortion in the nanocrystalline state, namely the lattice parameter a is increased, whereas c is decreased simultaneously with a reduction of grain size. The variation tendency of microhardness with grain size can be well correlated with the change of the unit cell volume in nc-Se, which implies that the lattice structure of the nanocrystalline state is a factor affecting the mechanical properties. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358688
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