Ionic transport and heat capacity of glass-forming metal-nitrate mixtures

A. Pimenov, P. Lunkenheimer, M. Nicklas, R. Böhmer, A. Loidl, Charles Angell

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

Ionic transport of the glass-forming metal - nitrate mixtures [Ca(NO3)2]0.4[RbNO3]0.6 (CRN), [Mg(NO3)2]0.44[KNO3]0.56 (MKN), and [Mg(NO3)2]0.44[NaNO3]0.56 (MNN) was investigated near the glass transition using broadband spectroscopy of the complex conductivity to 300 MHz. The real part of the conductivity exhibits a transition from frequency independent to power law behavior as found in most ionic conductors. At high frequencies the frequency exponent approaches unity and becomes larger at low temperatures. In the real part of the dielectric constant, a relaxation step could be observed in CRN. A detailed evaluation of the results within the modulus formalism is presented. The imaginary part of the electrical modulus exhibits well developed peaks which are described by the Kohlrausch-Williams-Watts function. All materials studied can be characterized as fragile glass formers. The results are compared to findings in [Ca(NO3)2]0.4[KNO3]0.6 (CKN). Low temperature heat capacity, for three nitrate glass-formers, including CKN, exhibits weak excess contributions near 10 K.

Original languageEnglish (US)
Pages (from-to)93-101
Number of pages9
JournalJournal of Non-Crystalline Solids
Volume220
Issue number1
DOIs
StatePublished - Oct 1997

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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