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  • 1
    Digitale Medien
    Digitale Medien
    Nonequilibrium phase transformation and magnetic properties of Ni3Sn2 during mechanical milling (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 1521-1527 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A nonequilibrium phase transformation in stoichiometric Ni3Sn2 during mechanical impact in a high-energy ball mill was monitored by the measurements of high-field magnetization, ac susceptibility, and x-ray diffraction. X-ray diffraction showed that the material transformed from the low-temperature Ni3Sn2 phase with Ni3Sn2-type orthorhombic structure to the high-temperature Ni3Sn2 phase with partially filled-up B8-type structure after 40 h of milling. Quenching was used to confirm the phase transformation during ball milling. The magnetization of the ball-milled high-temperature phase (metastable) is much higher than that of the quenched high-temperature phase, where both ball-milled and quenched high-temperature phases have higher magnetization than the low-temperature phase. The Curie temperature of our metastable high-temperature phase is quite close to that of the equilibrium phases (high- and low-temperature phases). The result is discussed in terms of atomic disordering induced by mechanical milling.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.353226
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  • 2
    Digitale Medien
    Digitale Medien
    Atomic disorder and phase transformation in L12-Ni3Al by mechanical milling (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 3438-3444 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Mechanical milling of the ordered L12-Ni3Al was performed in a high-energy ball mill. The milling process was monitored by x-ray diffraction, high-field magnetization, ac magnetic susceptibility, and differential scanning calorimetry (DSC). It was found that antisite disorder is generated in the early stages of milling and a phase transformation from the disordered L12 compound to the disordered fcc solid solution of Al in Ni was observed after milling for long periods. Partial amorphization occurs after prolonged periods of milling. The long-range-order parameter decreases monotonously with time in the early stages of milling and attains a zero value after relatively short periods of milling. The lattice parameter and the relative strain increase with milling time. Magnetic properties of ball-milled Ni3Al at 4.2 K differ markedly from those of the ordered state. Based on the magnetic data, it is concluded that short-range disordering could be the third source of energy storage during milling of Ni3Al. Exothermic heat effects resulting from atomic reordering and phase restoration and/or crystallization are evident in the DSC scans of ball-milled Ni3Al. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.359974
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  • 3
    Digitale Medien
    Digitale Medien
    Analysis of sequences of twist angles in DNA double helix
    Amsterdam : Elsevier
    International Journal of Biological Macromolecules 11 (1989), S. 165-168 
    Details
    ISSN: 0141-8130
    Schlagwort(e): DNA ; conformation ; twist angles
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0141-8130(89)90062-7
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  • 4
    Digitale Medien
    Digitale Medien
    Analysis of patterns of twist angles in DNA double helix
    Amsterdam : Elsevier
    International Journal of Biological Macromolecules 12 (1990), S. 226-232 
    Details
    ISSN: 0141-8130
    Schlagwort(e): DNA ; LS sequence ; promoter ; twist angles
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0141-8130(90)90001-Q
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