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The role of crystallization on microstructural and electrical studies of lithium germanium phosphate glass-ceramic electrolytes

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Abstract

The glass-ceramic samples with the general formula: (100 − x) [0.4Li2O-0.1GeO2-0.6P2O5] + x 40-h ball-milled Al2O3 (where x = 0, 2, 4, 6, 8, 10, and 12 mol%) were synthesized by high-energy ball milling technique. X-ray diffraction (XRD) analysis revealed that the phases such as LiGe2(PO4)3, Li4P2O7, GeO2, and AlPO4 were identified from major diffraction peaks of LGPA samples. The intensity and broadening of XRD peaks of LGPA glass-ceramic samples displayed that the LGPA10 glass-ceramic possesses major crystalline phases namely sodium super ionic conductor (NASICON)-type phases of LiGe2(PO4)3 and Li4P2O7. Scanning electron micrograph (SEM) pictures further confirmed that the sample LGPA10 has the presence of particles of varied sizes (20–30 nm) and also large clusters of less than 60 nm dispersed uniformly in a continuous glass matrix. The slight difference in the Z″ and M″ peaks for the LGPA samples suggests the presence of possibly more than one mechanism.

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Acknowledgments

The authors gratefully acknowledged Prof. B.S. Murty, Department of MME, IITM, India, for kindly extending the facility to acquire the XRD spectra and SEM pictures and also for his guidance in the interpretation of the XRD and SEM results.

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Authors and Affiliations

  1. Department of Physics, GITAM Institute of Technology, GITAM University, Hyderabad, India

    Ch. Krishna Kishore Reddy & R. Balaji Rao

  2. Department of Physics, College of Engineering and Technology, Osmania University, Hyderabad, India

    Ch. Gopal Reddy

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  1. Ch. Krishna Kishore Reddy
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  2. R. Balaji Rao
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  3. Ch. Gopal Reddy
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Correspondence to R. Balaji Rao.

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Reddy, C.K.K., Rao, R.B. & Reddy, C.G. The role of crystallization on microstructural and electrical studies of lithium germanium phosphate glass-ceramic electrolytes. Ionics 21, 967–979 (2015). https://doi.org/10.1007/s11581-014-1265-2

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