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Superionic Conductivity in a Lithium Aluminum Germanium Phosphate Glass–Ceramic

2008; Institute of Physics; Volume: 155; Issue: 12 Linguagem: Inglês

10.1149/1.2988731

1945-7111

Joykumar S. Thokchom, Nutan Gupta, Binod Kumar,

Ferroelectric and Piezoelectric Materials

In this paper, processing and characterization of sheet, pellet, and membrane specimens based on the lithium aluminum germanium phosphate (LAGP) glass–ceramic system is reported. X-ray diffraction patterns exhibited the presence of as the primary phase. Increasing heat-treatment temperature from led to the precipitation of an impurity phase, , and a large increase in LAGP grain size. The highest total conductivity of the LAGP glass–ceramic material at was obtained by crystallizing the glass sheet at for . The total conductivity of the specimen was in the range of in the temperature range. The pelletized specimen prepared from the glass–ceramic powder and sintered at for exhibited a slightly lower conductivity at . The membrane conductivity was above in the temperature range. High grain boundary conductivity is apparent in the LAGP glass-ceramic materials. The impurity phases and were attributed to a characteristic nonlinearity in the Arrhenius plots and mediated the transport of the lithium ion, which is associated with a higher activation energy.