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  • 1
    Electronic Resource
    Electronic Resource
    Yield properties, phase transition, and equation of state of aluminum nitride (AlN) under shock compression up to 150 GPa (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 6710-6716 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Inclined-mirror Hugoniot measurements were performed on pure AlN polycrystals in the pressure range up to 150 GPa to study the yield properties, phase transition, and equation of state. The Hugoniot-elastic limit (HEL) stress was approximately 9.4 GPa. Above the HEL, the Hugoniot data converged to a static compression curve despite the high thermal conductivity, which indicated that the thermal property is not an important factor in determining the shock yield property. The phase transformation from wurtzite-type (B4) to rock salt-type (B1) structure took place at approximately 19.4 GPa, and was completed by about 75 GPa. The corrected transition pressure at 298 K was 19.2 GPa. Shock velocity (Us) versus particle velocity (Up) relation of the final phase was given by Us=3.27+1.81Up km/s. The Birch–Murnaghan fitting curve of the calculated isothermal compression curve of the B1-type phase roughly coincided with the recent static x-ray diffraction data up to over 100 GPa. The Grüneisen parameter, bulk moduli (K0), and the pressure derivative (K0′) at zero pressure of the B1-type phase were estimated to be 1.51±0.03, 304±4 GPa, and 3.9±0.2 (K0″=−0.02), respectively. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371749
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  • 2
    Electronic Resource
    Electronic Resource
    Yielding and phase transition under shock compression of yttria-doped cubic zirconia single crystal and polycrystal (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 5060-5068 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Inclined-mirror Hugoniot measurements of yttria (Y2O3) -doped (9.6 and 8.0 mol %) cubic zirconia single crystal and polycrystal were performed in the pressure range up to 120 GPa to study yielding and phase transition. The Hugoniot-elastic limit (HEL) stresses parallel to the 〈100〉 and 〈110〉 axes were approximately 14 and 25 GPa, respectively, while that of the polycrystal was approximately 13 GPa. Above the HELs the Hugoniot data parallel toward the 〈100〉 and 〈110〉 axes converged on each other, and showed large relief to an isotropic compression state, while those of the polycrystal preserved a considerably larger shear strength. A phase transformation took place at approximately 53 GPa (both 〈100〉 and 〈110〉 axis directions), and was completed by about 70 GPa. The phase transition pressure was much higher than those of the monoclinic- or tetragonal-orthorhombic II phase transitions under static compression. The shock velocity Us versus particle velocity Up relation of the final phase of the single crystal was given by Us=2.19+2.35Up km/s. The equation of state of the final phase was analyzed by using a program based on the Debye model, the Mie–Grüneisen equation, and the Birch–Murnaghan equation. The volume change between the cubic phase and the final phase at zero pressure was estimated to be 20%, which was larger than that expected for the cubic-orthorhombic II transition. The bulk moduli of the final phase at zero pressure were estimated to be 510 GPa. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359314
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  • 3
    Electronic Resource
    Electronic Resource
    Anomalous shock compression behavior of yttria-doped tetragonal zirconia (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 5069-5076 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Shock-wave measurement and shock-compression recovery experiments of yttria (Y2O3) -doped (3.0 mol %) tetragonal zirconia in the pressure range up to 125 GPa were performed to study the anomalous shock compression and release behaviors. The minute three-wave structure with the transition points of 15–17 and 33–35 GPa was observed also by the inclined-mirror method, which is consistent with the VISAR (velocity interferometer system for any reflector) data. The shock velocities of the second wave were so fast that the first transition could not be identified as a normal elastoplastic transition. The shock velocity Us versus particle velocity Up relation of the final wave was given by Us=2.71+2.39Up km/s. The equation of state of the final phase was analyzed by using a program based on the Debye model, the Mie–Grüneisen equation, and the Birch–Marnaghan equation. The volume change between the tetragonal phase and the final phase at zero pressure was estimated to be 18%, which was larger than that expected for the tetragonal-orthorhombic II transition. The bulk moduli of the final phase at zero pressure was estimated to be 550 GPa. An instability was observed at release in the stress history of 28 GPa in peak stress. A certain amount of the monoclinic phase was observed at fractured surfaces of the recovered specimens from the shock compressions of below and above the first transition point (15–17 GPa) by Raman spectrum and transmission electron microscope observations. This might be related to the observed anomalous shock compression and release behaviors. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359315
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  • 4
    Electronic Resource
    Electronic Resource
    Hall effect of metallic Langmuir–Blodgett films based on bisethylenedioxytetrathiafulvalene complex of decyltetracyanoquinodimethane (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 2602-2604 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Hall effect of a metallic Langmuir–Blodgett film based on bisethylenedioxytetrathiafulvalene complex of decyltetracyanoquinodimethane has been investigated using a double ac Hall method. The polarity of the Hall coefficient is positive over the measuring temperature range. The carrier density is of the order of 1021 cm−3, almost independent of temperature, and the Hall mobility, of around 0.05 cm2 (V s)−1 at room temperature, is in a single activated process. The Hall results have been interpreted with an inhomogeneous structure model, and support that metallic domains are developed throughout the whole sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111539
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of solid phase crystallization in amorphized polycrystalline Si films on quartz substrates (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 4248-4251 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The solid phase crystallization of amorphized Si films on quartz substances is studied by means of the transmission electron microscope observation of grain growth. The amorphous Si films are prepared by Si ion implantation into polycrystalline Si films deposited by low-pressure chemical vapor deposition. It has been found that the twin formation in grains at the early stage of the crystallization accelerates the growth rate preferentially in a 〈112〉 direction. During the twin growth about a given 〈112〉 direction, other twins also grow from the twin boundary dendritically in some other 〈112〉 directions, leading to the formation of a large grain of dendritic structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343965
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  • 6
    Electronic Resource
    Electronic Resource
    Wavelength conversion of quadrupled Nd:YAG laser radiation to the vacuum ultraviolet by anti-Stokes stimulated Raman scattering (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 2175-2179 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Up-converted beams of a conventional quadrupled Nd:YAG laser by anti-Stokes Raman scattering in hydrogen are characterized as a vacuum ultraviolet light source. The beams diverge with the increase of the hydrogen pressure and also with the increase of the order of anti-Stokes scattering. Although the profiles of anti-Stokes beams vary from a Gaussian-like shape to a typical ring shape, the maximum energy conversion is always obtained with a near-Gaussian beam profile. The output energy ranges from 5.9 mJ for the first-order anti-Stokes wave (240 nm) to 8 μJ for the ninth-order anti-Stokes wave (133 nm). The energy of the sixth-order anti-Stokes wave (160 nm) fluctuates ±45% of the average output energy. The beam characteristics are described well by a model on the basis of phase matching between four waves related to each Raman process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354751
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