Abstract
A conductivity anomaly has been observed for the purified BeF 2CsF glass system. Initial additions of CsF to vitreous BeF 2 decrease the conductivity σ by two orders of magnitude. The minimum conductivity is at 3 mol% CsF whereupon further additions of the CsF modifier gradually increase σ. The vitreous BeF 2 and 44.0 Kcal/mol at the conductivity minima. A d.c. electrolysis technique verified that fluorine transport is the dominant transport mode at all CsF concentration. A model for conduction is proposed based upon two competing fluorine transport mechanisms: (1) an anti-Frenkel defect mechanism at low CsF concentrations, and (2) a classical non-bridging fluorine transport mechanism at higher CsF concentrations. The model shows fluorine transport to be highly dependent on hydroxyl impurities.
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