Novel Materials for Power Systems. Part 2. Investigations of Proton Semi-Conducting Glasses
Annual technical rept. 1 Jun 1973-31 May 1974
PURDUE UNIV LAFAYETTE IN SCHOOL OF ELECTRICAL ENGINEERING
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The phenomenon of unusually large electrical conductivity in glasses formed by the cooling of certain aqueous solutions of strong protonic acids has been investigated with the object of 1 establishing that the origin of the excess conductivity lies in the high mobility of protons in the glassy structure, and 2 determining the states of protons responsible for the phenomenon and examining the relation of the operative conductance mechanism to that oxide glass with mobile alkali metal cations. D.C. conductivity studies confirmed the protonic origin of the conductance, but showed also that the phenomenon was limited to glasses with relatively high glass transition temperatures. NMR and IR spectral studies showed that excess acid protons exchanged rapidly with water protons on the NMR time scale although two distinct proton environments are observed in the shorter time scale IR spectra. Conductivity relaxation studies were unable to find any basic differences in the electrical field response characteristics between the protonic conductors and the silicate glass ionic conductors.
- Physical Chemistry
- Solid State Physics