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

Research output: Contribution to journalArticle

17 Citations (Scopus)

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

Cite this

Pressure dependance of the ionic conductivity of Na- and Na-Rb borate glasses. / Imre, A. W.; Voss, S.; Berkemeier, F.; Mehrer, H.; Konidakis, I.; Ingram, Malcolm David.

In: Solid State Ionics, Vol. 177, No. 11, 04.2006, p. 963-969.

Research output: Contribution to journalArticle

Imre, AW, Voss, S, Berkemeier, F, Mehrer, H, Konidakis, I & Ingram, MD 2006, 'Pressure dependance of the ionic conductivity of Na- and Na-Rb borate glasses' Solid State Ionics, vol. 177, no. 11, pp. 963-969. https://doi.org/10.1016/j.ssi.2006.03.009
Imre, A. W. ; Voss, S. ; Berkemeier, F. ; Mehrer, H. ; Konidakis, I. ; Ingram, Malcolm David. / Pressure dependance of the ionic conductivity of Na- and Na-Rb borate glasses. In: Solid State Ionics. 2006 ; Vol. 177, No. 11. pp. 963-969.
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AU - Imre, A. W.

AU - Voss, S.

AU - Berkemeier, F.

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AU - Konidakis, I.

AU - Ingram, Malcolm David

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N2 - 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.

AB - 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.

KW - alkali borates

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KW - ionic conductivity

KW - pressure dependence

KW - MIXED-CATION GLASSES

KW - ELECTRICAL-CONDUCTIVITY

KW - TRACER DIFFUSION

KW - ACTIVATION VOLUMES

KW - SILICATE-GLASSES

KW - OXIDE GLASSES

KW - TRANSPORT

KW - TEMPERATURE

KW - TRANSITION

KW - CRYSTALS

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