Pressure dependance of the ionic conductivity of Na- and Na-Rb borate glasses

A. W. Imre, S. Voss, F. Berkemeier, H. Mehrer, I. Konidakis, Malcolm David Ingram

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Abstract

The ionic conductivity of Na- and Na-Rb borate glasses is investigated as a function of hydrostatic pressure. Activation volumes of the dc conductivity are obtained from pressure-dependent ac conductivity measurements at a constant temperature of 180 degrees C. The activation volume of Na borate glasses decreases with increasing alkali content. It depends linearly on a separation parameter which is defined as the ratio of the average ionic distance and the average network atom distance. The activation volume of Na-Rb borate glasses increases from both end-members towards the mixed-alkali regime and passes through a maximum near the relative content Na/(Na+Rb)=0.4. In addition to mobility anomalies, observed earlier in these borate glasses, the maximum in the activation volume is a further important fingerprint of the mixed-alkali effect. (c) 2006 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)963-969
Number of pages7
JournalSolid State Ionics
Volume177
Issue number11
DOIs
Publication statusPublished - Apr 2006

Keywords

  • alkali borates
  • mixed-alkali effect
  • impedance spectroscopy
  • ionic conductivity
  • pressure dependence
  • MIXED-CATION GLASSES
  • ELECTRICAL-CONDUCTIVITY
  • TRACER DIFFUSION
  • ACTIVATION VOLUMES
  • SILICATE-GLASSES
  • OXIDE GLASSES
  • TRANSPORT
  • TEMPERATURE
  • TRANSITION
  • CRYSTALS

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