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  • 2005-2009  (2)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Low Temperature Kinetics of In-Cd Solid Solution Decomposition (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 137 (Mar. 2008), p. 35-42 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: An influence of Cd content on the kinetics of a spontaneous low-temperature structuretransformation in In-rich In - Cd alloys has been investigated using acoustic, resistivity and DSCtechniques.It is established that increase of the concentration of Cd leads to an essential increase ofa driving force of the transition that results in an increase of the transition rate and in decrease of therelaxation time. The low-temperature instability of acoustic, resistivity and thermal properties iscaused presumably by a decomposition of the solid solution that has features of a phase transition ofthe 1st order. The main empirical activation parameters of the transformation are derived. Theactivation energy amounts to U0 = 0.43 eV, the attempt period is τ 0 =5 × 10-9 s. The probable borderof the decomposition in the phase diagram of the In-Cd system is established
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.137.35.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of Heat Treatment on Acoustic Properties of Chromium Polycrystals at Low Temperatures (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 137 (Mar. 2008), p. 43-48 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Acoustic properties of polycrystalline Cr samples of 99.99 % purity are investigated atfrequencies of longitudinal vibrations f ~ 75 kHz and of bending vibrations at 0.6 〈 f 〈 1.5 kHzwhen thermocycling within the temperature interval 5 − 330 K. Special attention is paid to theacoustic anomalies in the vicinity of the magnetic phase transitions: the Néel point and the spin-fliptransition. In the as-received samples, a significant hysteresis of the acoustic properties has beenfound for the first time. The effect of heat treatments on internal friction and elastic properties ofchromium polycrystals is also investigated. The data obtained are compared with the effect of smallpreliminary deformation and а long-time ageing at room temperature on the ultrasound anomalies inCr single crystal. The observed behavior of the acoustic properties may be caused by changes in theantiferromagnetic domain structure in Cr polycrystals under the action of thermoelastic stressesarising from quenching, preliminary plastic deformation or thermocycling
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.137.43.pdf
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    Paper (German National Licenses)
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