Abstract
Composite proton-conducting solid electrolytes have been formed from α-zirconium hydrogen phosphate (α-Zr(HPO 4) 2·H 2O, α-ZrP) and aluminas (Al 2O 3) in varying mole ratios. Conductivity variations as a function of temperature have been characterised and compared to that for a delaminated α-ZrP (no alumina). There are no appreciable conductivity enhancements on composite formation, but conductivity for materials ca. 50 mole% in alumina can be comparable to the delaminated material. Differential scanning calorimetry shows the composites to have different thermal properties to simple admixtures. High resolution 31P NMR studies show reaction to form aluminium phosphate at the interface between components.
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