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Composition and structure dependence of the properties of lithium borophosphate glasses showing boron anomaly
This work presents a study on the structure, microstructure and properties of 50Li2O xB2O3 (50 x)P2O5
glasses. The structure has been studied through NMR spectroscopy and the microstructure by TEM. The
properties of the glasses are discussed according to their structure and microstructural features. The
introduction of boron produces new linkages between phosphate chains through P–O–B bonds, whose
amount increases with boron incorporation; at the same time, a depolymerisation of the phosphate
chains into Q1-type phosphate units takes place. The introduction of boron produces an increase in Tg
together with a decrease in the molar volume. The room temperature electrical conductivity increases
with boron content as well. However, B2O3 contents higher than 20 mol% lead to crystallisation of lithium
orthophosphate which contributed to hinder ionic conduction of the glasses.Peer reviewe