Enrichment of the phosphate glass by lithium due to ZrP2O7 crystallization from the Li2O-P2O5– ZrO2 melt

S.V. Pershina, А. А. Raskovalov, B. D. Аntonov, О. G. Reznitskikh, Т. V. Yaroslavtseva

KEYWORDS:

lithium-ion conductivity, phosphate glass, glass-ceramics, ZrP2O7

ABSTRACT:

 The lithium-ion conducting Li2O–P2O5–ZrO2 glass-ceramics was obtained using melt- quenching procedure. Optical microscopy testified that the morphology of  crystalline inclusions strongly depends on the initial zirconia concentration in the melt. The formed crystalline phase was identified by X-ray diffraction analysis as zirconium pyrophosphate, ZrP2O7. According to the impedance spectroscopy results, the ionic conductivity of the 50Li2O · 44P2O5 · 6ZrO2 composition is an order of magnitude higher compared with that of the original 50Li2O · 50P2O5 glass. It was revealed that this conductivity enhancement is due to the Li+ ions enrichment in the residual glass phase and, hence, to the charge carrier concentration growth.