Lithium–germanium–phosphate glassceramic electrolytes: correlation between the nanocrystallization and electrical studies

Abstract

Investigations on the microstructural and electrical properties of a glassceramic system: (100 − x) [0.4Li2O − 0.1GeO2 − 0.6P2O5] + x [20 h ball milled Ga2O3] (0 ≤ x ≤ 10 mol%, in the regular steps of 2 mol%) via high-energy ball milling technique are reported. XRD spectra of LGePG glassceramic samples were identified major crystalline phases such as Li3Ge2(PO4)3 (NASICON-type phase), Ga2Li3(PO3)7 and GeO2 from the major diffraction peaks. Bulk conductivity of all these samples was measured for the powder-compressed pellets by ac impedance method. The correlation of log(σ) and M″ peaks suggests the presence of single conduction mechanism in the LGePG glassceramic samples. The results are discussed in the light of degree of crystallization of lithium phosphate glass network.