Abstract
The electrical properties and internal friction in (40−x)Fe2O3·xNa20.60P2O5 glasses were measured. Two or three peak on internal friction were observed in the temperature range of −100 to 300° C at a frequency of about 1 Hz. The peak area of internal friction could be explained quantitatively by the additivity law of diffusion of Na+ ion and hopping of electrons which are carriers similar to those of dielectric loss. Activation energy, peak temperature of dielectric loss and internal friction showed almost the same value. Both relaxation phenomena have the same mechanism which is due to the diffusion of Na+ion and the hopping of electrons between Fe2+ ⇌ Fe3+. The high-temperature peak is assumed to result from the interaction between protons or alkali ions and non-bridging oxygen.
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