High-temperature X-ray analysis of phase evolution in lithium ion conductor Li1.5Al0.5Ge1.5(PO4)3

High temperature X-ray diffraction (HT-XRD) and Rietveld refinement of Li1.5Al0.5Ge1.5(PO4)3 (LAGP) glass-ceramics were recorded to investigate the phase transformation, cell parameters and the mass fraction of each crystal phase, which occur in the glass to glass-ceramics process during different crystallization temperatures. The relationship between the average grain size and conductivity that originate from and relate to the crystallization temperature was analyzed by SEM micrograph and AC impedance spectroscopy.