Effect of Particle Size and Pretreatment on the Conductivity of Glass Powder during Compaction

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Authors

  • Dawid Murawski
  • Harald Behrens
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Details

Original languageEnglish
Pages (from-to)1323-1343
Number of pages21
JournalZeitschrift für Physikalische Chemie
Volume231
Issue number7-8
Early online date12 Jul 2017
Publication statusPublished - 26 Jul 2017

Abstract

Physical properties of solid materials can be strongly modified by pressure treatment at elevated temperatures. This study focuses on the compaction-induced behavior of powdered amorphous solids using Li2Si3O7-glass as an example. Experiments were carried out on distinct fractions with particle sizes from <25 μm to 224-250 μm. Measurements of electrical conductivity using impedance spectroscopy were carried out in situ at pressures up to 930 MPa and at temperatures from 373 K to 667 K. Simultaneous monitoring of volume changes allows correlating conductivity and porosity of samples. To study the effect of adsorbed water on surfaces, the material was pretreated by flushing with water-bearing nitrogen before the experiment. Continuous increase of electrical conductivity upon pressurization was observed for all particle size fractions both in the brittle and in the plastic deformation regimes. The pressure derivative of DC conductivity strongly increases with grain size at low T (373 K). At high T (608-665 K) the effect is less pronounced due to the onset of welding of particles forming continuous pathways for charge transport without grain boundaries as barriers. Welding of particles occurs already at temperatures significantly below the glass transition temperature, induced by strong local forces at grain-grain contacts. No effect by pretreatment of glass powder with water vapor was observed at low temperature, while at high temperature surface modification by adsorbed water resulted in enhancement of electrical conductivity, probably caused by lowering of viscosity at grain surfaces, which facilitates welding of particles.

Keywords

    amorphous solids, conductivity, impedance spectroscopy, lithium mobility, porosity, powder compaction, water vapor

ASJC Scopus subject areas

Cite this

Effect of Particle Size and Pretreatment on the Conductivity of Glass Powder during Compaction. / Murawski, Dawid; Behrens, Harald.
In: Zeitschrift für Physikalische Chemie, Vol. 231, No. 7-8, 26.07.2017, p. 1323-1343.

Research output: Contribution to journalArticleResearchpeer review

Murawski D, Behrens H. Effect of Particle Size and Pretreatment on the Conductivity of Glass Powder during Compaction. Zeitschrift für Physikalische Chemie. 2017 Jul 26;231(7-8):1323-1343. Epub 2017 Jul 12. doi: 10.1515/zpch-2016-0926
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