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Orientationally disordered glassy phases

  • Conference paper
Soft Matter under Exogenic Impacts

Part of the book series: NATO Science Series II: Mathematics, Physics and Chemistry ((NAII,volume 242))

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Abstract

Broadband dielectric spectroscopy (BDS) studies for a remarkable temperature range (230 K) in a supercooled orientationally disordered phase given rise to an orientational glass have been performed in mixed crystal formed between NPG ((CH3)2C(CH2OH)2) and NPA ((CH3)3C(CH2OH)) compounds. The α-relaxation slows down and the width of the dielectric spectra becomes broader with decreasing temperature without any additional relaxation process, making easy the fitting procedure of the relaxation loss spectra. The existence of three dynamic domains is made evident: For the high temperature region the relaxation time obeys an Arrhenius behavior, while when decreasing temperature two crossover temperatures define the temperature intervals for which two different VFT regimes are clearly visible. The shape parameters α and α·β according to the fit of HN function have been determined. Approaching T g , the common feature of many structural glass forming materials (decrease of the shape parameters with temperature) is found, indicating the strong deviation from the Debye behavior. Both parameters seem to reach the claimed universal value of 0.5.

According to MCT theory, the temperature dependence of the relaxation time seems to validate the general trend given by the MCT equation. But a fine-tuning reveals the existence of three different regimes governed by three different exponents γ.

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Authors and Affiliations

  1. Department of Physics and Nuclear Engineering, ETSEIB, Laboratory of Characterization of Materials, Diagonal, 647, 08028, Barcelona, Catalonia, Spain

    J. Ll. Tamarit

  2. Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007, Katowice, Poland

    S. Pawlus

  3. Institute of Physics, Silesian University, ul. Universytecha 4, 40-007, Katowice, Poland

    A. Drozd-Rzoska

  4. Department of Biophysics and Molecular Physics, Institute of Physics, Silesian University, Katowice, Poland

    S. J. Rzoska

Authors
  1. J. Ll. Tamarit
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  2. S. Pawlus
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  3. A. Drozd-Rzoska
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  4. S. J. Rzoska
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Editor information

Editors and Affiliations

  1. Department of Biophysics and Molecular Physics, Silesian University, Katowice, Poland

    Sylwester J. Rzoska

  2. Department of Themodynamics, Institute of Energy and Ecology, State Academy of Refrigeration, Odessa, Ukraine

    Victor A. Mazur

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© 2007 Springer

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Tamarit, J.L., Pawlus, S., Drozd-Rzoska, A., Rzoska, S.J. (2007). Orientationally disordered glassy phases. In: Rzoska, S.J., Mazur, V.A. (eds) Soft Matter under Exogenic Impacts. NATO Science Series II: Mathematics, Physics and Chemistry, vol 242. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-5872-1_11

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