High Na‐ion conducting Na1+x[SnxGe2−x(PO4)3] glass‐ceramic electrolytes: Structural and electrochemical impedance studies |
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| Authors: | Suman Gandi Srinivasa Rao Chinta Prasanta Kumar Ojha Manubolu Surya Surendra Babu Balaji Rao Ravuri |
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| Affiliation: | 1. Department of Physics, School of Technology, GITAM University, Hyderabad, India;2. Naval Materials Research Laboratory, Thane, Maharashtra, India;3. Department of Chemistry, School of Technology, GITAM University, Hyderabad, India |
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| Abstract: | Na‐ion conducting Na1+xSnxGe2?x(PO4)3] (x = 0, 0.25, 0.5, and 0.75 mol%) glass samples with NASICON‐type phase were synthesized by the melt quenching method and glass‐ceramics were formed by heat treating the precursor glasses at their crystallization temperatures. XRD traces exhibit formation of most stable crystalline phase NaGe2(PO4)3 (ICSD‐164019) with trigonal structure. Structural illustration of sodium germanium phosphate NaGe2(PO4)3] displays that each germanium is surrounded by 6 oxygen atom showing octahedral symmetry (GeO6) and phosphorous with 4 oxygen atoms showing tetrahedral symmetry (PO4). The highest bulk Na+ ion conductivities and lowest activation energy for conduction were achieved to be 8.39 × 10?05 S/cm and 0.52 eV for the optimum substitution levels (x = 0.5 mol%, Na1.5Sn0.5Ge1.5(PO4)3]) of tetrahedral Ge4+ ions by Sn4+ on Na–Ge–P network. CV studies of the best conducting Na1.5Sn0.5Ge1.5(PO4)3] glass‐ceramic electrolyte possesses a wide electrochemical window of 6 V. The structural and EIS studies of these glass‐ceramic electrolyte samples were monitored in light of the substitution of Ge by its larger homologue Sn. |
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| Keywords: | conductivity electrical properties glass‐ceramics microstructure |
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