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  • 1
    Electronic Resource
    Electronic Resource
    Subvalent Group 14 metal compounds. XIV. The X-ray crystal structures of two monomeric Group 14 metal bisamides, Ge[N(SiMe"3)"2]"2 and Sn[NC(Me)"2(CH"2)"3CMe"2]"2
    Amsterdam : Elsevier
    Inorganica Chimica Acta 198-200 (1992), S. 203-209 
    Details
    ISSN: 0020-1693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0020-1693(00)92362-4
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  • 2
    Electronic Resource
    Electronic Resource
    Remote monitoring of thermal conductivity of a powder by a flash radiometry technique (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 2227-2229 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We study the dependence of the thermal conductivity of a carbon-loaded epoxy powder on its porosity using a noncontact flash radiometry technique. The thermal conductivity is found to be very small when the porosity of the sample is higher than a critical value. Below the critical porosity Pcrit, thermal conductivity increases linearly with packing density. This phenomenon can be explained by a two-phase model; the powder exhibits continuous thermal conduction paths only when the porosity is less than Pcrit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341690
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  • 3
    Electronic Resource
    Electronic Resource
    Transmission studies of explosive vaporization of a transparent liquid film on an opaque solid surface induced by excimer-laser-pulsed irradiation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 2256-2263 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dynamics of the explosion of a liquid film by an ultraviolet excimer pulsed laser is studied experimentally on top of an amorphous silicon (a-Si) film deposited on fused quartz. In particular, the transient temperature as well as the nucleation of the superheated liquid at the interface for laser fluences below and above the spontaneous nucleation threshold are monitored using an optical transmission technique. Results for different pure and mixed liquids are presented for cases of different thicknesses of the a-Si film. Details for the calibration of the transmission signal to obtain the interface temperature are provided through the application of the one-dimensional diffusion model and the characteristic matrix theory using data obtained from previous steady-state experiments. The calibrated results are in reasonable agreement with the known data for superheated liquids in the literature as well as theoretical calculations. In addition, the delay times for spontaneous nucleation of the liquids are estimated to be (approximately-less-than)1 μs, generally comparable with those observed in droplet explosion experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351619
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal conductivity of metallic glasses (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 5335-5339 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The thermal diffusivity D of three metallic glasses Fe80B20, Fe40Ni40P14B6, and Fe32Ni36Cr14P12B6 has been measured from 160 to 500 K by the laser-flash radiometry method and the thermal conductivity K has been calculated from these data. The accuracy of D and K is 6% and 8%, respectively. The electronic contribution (Ke) to the thermal conductivity, evaluated by using the Wiedemann–Franz law, increases almost linearly with increasing temperature. The phonon thermal conductivity Kph follows the temperature dependence exhibited by all amorphous dielectrics, i.e., Kph is roughly proportional to the phonon specific heat, thus giving an approximately constant phonon mean free path. When the metalloid atom B is replaced by P or the number of chemical components in the alloy is increased, both Ke and Kph decrease, but the drop in Kph is much more significant. The phonon mean free paths for Fe80B20 and Fe40Ni40P14B6 are 14 and 12 A(ring), respectively, which are substantially higher than the values (5–8 A(ring)) for amorphous insulators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343725
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal conductivity of amorphous alloys above room temperature (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 4919-4925 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The thermal conductivity of ten amorphous alloys has been measured between 280 and 500 K. The thermal conductivity, K, can be separated into the electronic (Ke) and phonon (Kph) contributions. The electronic thermal conductivity, deduced from the Wiedemann–Franz law, varies almost linearly with temperature, whereas the phonon thermal conductivity shows a slower increase. At 300 K, Kph accounts for 34–49% of K. The phonon mean free path l is 12.5 A(ring) for the binary alloy Fe80B20, but l decreases as the number of chemical components increases, reaching 7 A(ring) for the five-component alloys Fe32Ni36Cr14P12B6 and Co66Fe4Mo2B12Si16. The metal-metal glasses, Cu70Zr30 and Cu45Zr55, have l values slightly larger than 11 A(ring), indicating that they have short-range order similar to that of Fe80B20.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349037
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  • 6
    Electronic Resource
    Electronic Resource
    Specific heat and thermal diffusivity of strontium barium niobate (Sr1−xBaxNb2O6) single crystals (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 170-173 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The specific heat and thermal diffusivity of Sr1−xBaxNb2O6 (x=0.33 and 0.48) single crystals have been measured between 130 and 500 K, and the sound velocity has been measured at 295 K. At x=0.33 the specific heat shows a broad peak at 335 K, indicating the onset of a ferroelectric phase transition. The peak sharpens and shifts to about 383 K at x=0.48. A jump in the thermal diffusivity D is observed at the transition. Away from the transition, however, D is roughly independent of temperature. There is very little anisotropy in D, with the value along the a axis marginally higher than that along the c axis. Outside the transition region the phonon mean free path l is approximately constant, and has values of 5.1 and 5.6 A(ring), respectively, below and above the transition. The low values of D and l are due to the disorder arising from the random distribution of five Sr/Ba ions over six possible sites in a unit cell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350732
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  • 7
    Electronic Resource
    Electronic Resource
    Excimer laser ablation of ferrites (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 2072-2075 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Laser etching of ferrites was previously done by scanning a focused continuous-wave laser beam on a ferrite sample in a chemical environment. We study the phenomenon of photo-ablation of Ni-Zn or Mn-Zn ferrites by pulsed 248-nm KrF excimer laser irradiation. A transfer lens system is used to project a grating pattern of a mask irradiated by the pulsed KrF laser onto the ferrite sample. The threshold fluence for ablation at the ferrite surface is about 0.3 J/cm2. A typical fluence of 1 J/cm2 is used. The etched grooves produced are typically 20–50 μm wide, with depths achieved as deep as 70 μm . Groove straightness is good as long as a sharp image is projected onto the sample surface. The wall angle is steeper than 60 degrees. Scanning electron microscopy of the etched area shows a "glassy'' skin with extensive microcracks and solidified droplets being ejected that is frozen in action. We found that this skin can be entirely removed by ultrasonic cleaning. A fairly efficient etching rate of about 10 nm/pulse for a patterned area of about 2 mm×2 mm is obtained at a fluence of 1 J/cm2. This study shows that projection excimer laser ablation is useful for micromachining of ferrite ceramics, and indicates that a hydrodynamic sputtering mechanism involving droplet emission is a cause of material removal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348915
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  • 8
    Electronic Resource
    Electronic Resource
    Thermal conduction at a contact interface measured by pulsed photothermal radiometry (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4505-4510 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have used pulsed photothermal radiometry to measure the thermal contact resistance at the interface of a smooth polymer film and a polished metal substrate. This method relies on the heating of the film surface by a short light pulse and detecting the subsequent infrared thermal radiation from the surface. An analytical solution to the heat diffusion equation shows that in a suitable delayed time interval, the infrared signal decays exponentially in time with a time constant related to the thermal contact resistance of the interface. By changing gases in the interface at constant pressures, we are able to separate the thermal conductance into two components: that due to solid contacts and that due to gas conduction. The thermal conductance due to gas conduction in the interface is proportional to the thermal conductivity of the gas found in continuum fluid theory, except for He which is more than 30% lower. We believe that the discrepancy in He is partly due to the fact that the mean free path of He gas molecules is not much smaller than the mean width of the gaps in the interface and so the classical continuum fluid theory for heat conduction would no longer hold.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340146
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  • 9
    Electronic Resource
    Electronic Resource
    Noncontact measurement of thermal conductivity of epoxy bonds by pulsed photothermal radiometry (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 2085-2087 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pulsed photothermal radiometry relies on the flash heating of a surface and the detection of the time dependence of the surface cooling by infrared radiometry. We show that this is useful as a nondestructive and noncontact technique to quantify the thermal conductivity of a subsurface epoxy bond underneath an opaque surface. The degree of curing of the epoxy can also be monitored.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98955
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  • 10
    Electronic Resource
    Electronic Resource
    Transient absorption and fluorescence spectroscopy in fused silica induced by pulsed KrF excimer laser irradiation (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 3369-3371 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have carried out in situ transient absorption and fluorescence spectroscopy measurements in two "wet''(OH content ∼0.1%) fused silica samples (Suprasil II from Heraeus Amersil and P-30 from Shin-Etsu Quartz Product) during KrF laser irradiation. Both samples exhibit an absorption peak at 210 nm corresponding to the E' center. For Suprasil II, there is also a 265 nm absorption peak, and both peaks increase with the number of irradiated pulses showing little relaxation after the laser was turned off. The region irradiated with three million pulses at 400 mJ/cm2 fluence ten months ago has a residual absorption of about 10%/cm at 210 nm. On the other hand, the P-30 shows a rapid increase in the 210 nm absorption in both the unirradiated and previously irradiated regions during the initial irradiation and levels off after a few thousand pulses. There is no residual absorption at the spot irradiated for 63 million pulses ten months ago. However, the initial rate of increase in the previously irradiated spot is twice as high as compared to the unirradiated spot. This suggests the density of the precursor state for the E' center is higher in the previously irradiated region. The fluorescence intensity at 650 nm increases with the induced absorption for Suprasil II, but is almost independent of the number of irradiation pulses in P-30. The quasilinear repetition-rate dependence suggests the fluorescence is transient in nature and relaxes partially between successive laser pulses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105703
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