Studies on glass transition of lithium-iron phosphate glasses

Amorphous analogs of lithium-iron phosphates (LFP) were prepared by standard press-quenching method and their thermal stabilities as well as structural properties were studied for the first time. Glass transition temperature T-g determined by DTA method was observed at the temperature range 492-523 degrees C, depending on the glass composition. The maxima of crystallization peaks were observed in the 555-579 degrees C range. In products obtained after heating LIP to 700 degrees C the XRD patterns have revealed the presence of: LiFePO4 (triphylite), FePO4 (heterosite), alpha-FePO4 (quartz like structure) and Li3Fe2(PO4)(3) (Nasicon like structure) phases.