Although the frequency dependent conductivity of ion-containing glasses often displays scale invariant power law dispersion at high temperatures, the exponent increases to unity at lower temperatures. We report measurements of the conductivity of a series of alkali metaphosphate glasses including a mixed alkali composition and demonstrate that this temperature dependence results from the superposition of two power law dispersions originating from separate mechanism, and does not indicate any intrinsic change in scaling of the process which dominates at high temperatures. © 1995 The American Physical Society.
D. L. Sidebottom et al., "Two Contributions to the Ac Conductivity of Alkali Oxide Glasses," Physical Review Letters, American Physical Society (APS), Jan 1995.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.74.5068
Materials Science and Engineering
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© 1995 American Physical Society (APS), All rights reserved.