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  • Chem Sci Trans., 2017, 6(1),  pp 107-113  

    DOI:10.7598/cst2017.1339

    Research Article

    Soft Mode Dynamics of Order-Disorder Type Crystals

  • VIJAY SINGH BIST* and NARAYAN SINGH PANWAR
  • Department of Instrumentation Engineering-USIC, School of Engineering and Technology, H N B Garhwal University, Srinagar (Garhwal), Uttrakhand - 24 6174, India
  • Abstract

    The soft mode dynamics and related properties of order-disorder type crystals have been studied. The phonon width and shift have been calculated, which lead to the renormalization of the relaxation soft-mode. The dielectric properties are directly related to the relaxational soft mode behavior of stochastic motion of H2PO4- groups in order-disorder (KDP-system) crystals. The analysis of the temperature dependence of microwave loss tangent and dielectric constant explain the experimental results.

    Keywords

    Relaxational soft- mode, Stochastic motion, Microwave loss tangent

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