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  • 1
    Electronic Resource
    Electronic Resource
    Age and duration of Peking man site by fission track method
    Amsterdam : Elsevier
    International Journal of Radiation Applications & Instrumentation. Part D, 19 (1991), S. 719-724 
    Details
    ISSN: 1359-0189
    Keywords: Fission track dating ; age and duration of Peking Man Site ; ancient ash ; sphene
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/1359-0189(91)90299-W
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  • 2
    Electronic Resource
    Electronic Resource
    Comparison of the thermal stability of NiSi films in Ni/Pt/(111)Si and Ni/Pt/(100)Si systems (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 745-749 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The thermal stability of NiSi films in Ni/Pt/(111)Si and Ni/Pt/(100)Si bilayered systems was investigated. In the Ni/Pt/(111)Si system, the NiSi films formed at 640 °C have an epitaxial relationship of (100)NiSi(parallel)(111)Si and [01¯0]NiSi(parallel)[011¯]Si with the substrates. On the other hand, those formed on (100)Si substrates were polycrystalline although the experimental parameters are the same as those in Ni/Pt/(111)Si samples. In both cases, NiSi and PtSi formed a solid solution Ni1−xPtxSi following Vegard's law. While the thermal stability of NiSi films is improved in both cases compared with the Ni/Si system, the thermal stability of the textured NiSi films formed on (111)Si substrates is higher than their polycrystalline counterparts formed on (100)Si substrates. This is attributed to the reduced interfacial energy and consequently increased activation energy for the nucleation of NiSi2 due to the formation of textured NiSi films on (111)Si substrates. At 900 °C, the Ni(Pt)Si film formed in Ni/Pt/(100)Si system decomposed into separate phases of NiSi and PtSi with noticeable lattice deformation. Differences between the texture evolution of NiSi films in Ni/Pt/Si and Ni(Pt) alloy/Si systems were also reported and explained from both kinetic and thermodynamic aspects. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1379053
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  • 3
    Electronic Resource
    Electronic Resource
    Abnormal temperature dependence of intrinsic coercivity in Sm(Co, Fe, Cu, Zr)z powder materials (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 3007-3009 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The intrinsic coercivity Hci in Sm(CobalCuxFe0.1Zr0.033)z powder materials was found to increase with increasing temperature when Cu content x=0.048, but to decrease when Cu content x≥0.068. This abnormal behavior, which is also reversible, was found in a series of samples with various ratios z. The field dependence of the intrinsic coercivity suggests that the bonded magnets were fully saturated with an applied field of 20 kOe. The exposure to higher temperatures did not change the room temperature value of coercivity. This indicates that the microstructure does not change during the measurement from 573 to 773 K. The change of coercivity mechanism was found to be responsible for this abnormal temperature behavior. Monte Carlo simulation showed that the coercivity increases (decreases) with increasing temperature for the repulsive (attractive) cell boundary, which is consistent with the experimental results. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122659
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  • 4
    Electronic Resource
    Electronic Resource
    The first x-ray diffraction station at Beijing Synchrotron Radiation Laboratory, BEPC : Proceedings of the 4th international conference on synchrotron radiation instrumentation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 1078-1079 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The first x-ray diffraction experimental station at Beijing Synchrotron Radiation Laboratory has been available for synchrotron radiation users in research. The station is located on the back-end of 4B9A, a beamline from a bending magnet. When the storage ring of BEPC operates in a dedicated mode (2.2 GeV), 4B9A provides a focused monochromatic x ray in between 4 and 12 keV. A four-circle diffractometer with a crystal analyzer is installed. Experimental processes such as apparatus alignment, monitoring of incident radiation, acquisition of diffracted intensities, and running of the monochromator, are controlled with a computer through CAMAC modules. In this article, instrumentation and performances of the station are outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143205
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  • 5
    Electronic Resource
    Electronic Resource
    New rare-earth permanent magnets with an intrinsic coercivity of 10 kOe at 500 °C (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5660-5662 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Sm(CobalFe0.1CuxZr0.033)z magnets with higher Cu content were found to have higher intrinsic coercivity Hci at both room temperature and higher temperatures up to 500 °C. For the magnets with a ratio z=8.5, the intrinsic coercivity reaches a maximum of about 40 kOe at room temperature when the Cu content x reaches 0.088. But for the magnets with a ratio z=7.0, the intrinsic coercivity continues to increase with increasing Cu content x up to 0.128. Microstructure analysis showed that the cell size decreases while the density of lamella phase increases with increasing Cu content. A record high intrinsic coercivity of 10.8 kOe at 500 °C was obtained on a Sm(CobalFe0.1Cu0.128Zr0.033)z magnet. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369832
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  • 6
    Electronic Resource
    Electronic Resource
    Microstructure and high temperature magnetic properties of Sm(Co, Cu, Fe, Zr)z (z=6.7–9.1) permanent magnets (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 2800-2804 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of ratio z on the high temperature magnetic properties of Sm(Co, Fe, Cu, Zr)z magnets have been examined in a range of ratio z values from 6.7 to 9.1. Reasonably high coercivity at room temperature has been achieved in all the magnets. It was found that the lower the ratio z, the smaller the temperature coefficient of coercivity. When the ratio z=7.0, a temperature coefficient of coercivity of −0.03%/°C can be achieved, which is more than eight times smaller than the magnet with z=8.5. A coercivity of more than 10 kOe has been obtained at 773 K for the newly developed magnets, which is believed to be the highest coercivity at 773 K ever reported. Transmission electron microscope studies showed that the cell size decreases with the decrease of the ratio z, while the density of lamella phase remains almost the same. This suggests that smaller cell size leads to a smaller temperature coefficient of intrinsic coercivity. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369597
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of iron on the high temperature magnetic properties and microstructure of Sm(Co, Fe, Cu, Zr)z permanent magnets (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 1670-1674 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have fabricated a new magnet with nominal composition of Sm(CobalFe0.1Cu0.078Zr0.033)8.3, which has a room temperature intrinsic coercivity Hci of 40 kOe and a saturation magnetization Ms of 92 emu/g. The new magnet has a temperature coefficient of intrinsic coercivity β(RT−773 K)=−0.15%/K and a high intrinsic coercivity of 10.7 kOe at 773 K. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369304
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  • 8
    Electronic Resource
    Electronic Resource
    Improvement of the thermal stability of NiSi films by using a thin Pt interlayer (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 2177-2179 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of a thin interlayer of Pt on the stability of NiSi films on Si(111) substrates has been investigated. Both x-ray diffraction (XRD) data and sheet resistance measurements show a remarkable improvement in the thermal stability of NiSi due to the Pt interlayer. Detailed study on the XRD data shows PtSi and NiSi form a solid solution following a Vegard's law. It was found in Ni/Pt/Si samples that a transition in NiSi texture from (200)NiSi||(111)Si to (002)NiSi||(111)Si took place before the nucleation of NiSi2, which may contribute to the enhanced stability of NiSi films. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1313815
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  • 9
    Electronic Resource
    Electronic Resource
    Film thickness dependence of the NiSi-to-NiSi2 transition temperature in the Ni/Pt/Si(100) system (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 270-272 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of film thickness on the NiSi-to-NiSi2 transition temperature in the Ni/Pt/Si(100) system has been studied. Three sets of Ni/Pt/Si(100) bilayered samples with the same Ni:Pt ratios but with different film thicknesses were annealed by rapid thermal annealing at 750–900 °C. Both the x-ray diffraction analysis and the sheet resistance measurement show that the thermal stability of Ni(Pt)Si films improves with a decrease in film thickness. This property of Ni(Pt)Si films reveals the good potential for its applications in ultrashallow junctions. The experimental results are explained in terms of classical nucleation theory. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1434311
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic and structural properties of commercial Sm2(Co,Fe,Cu,Zr)17-based magnets : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 7139-7141 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A newly developed Sm(Co,Fe,Cu,Zr)z magnet, with z(approximate)7, has a lower temperature coefficient of coercivity β, as compared with other commercial magnets with z(approximate)7.7. It was found that the initial magnetization curve for the newly developed magnet is typical of pure uniform domain wall pinning, while for the commercial magnets nucleation and domain wall pinning occur simultaneously, although domain wall pinning is still the dominant mechanism. It was also found that the magnetic viscosity parameter Sv has similar temperature dependence with the coercivity. Transmission electron microscope studies showed that the smaller cell size contributes to the low temperature coefficient of coercivity. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367565
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