| Autor: |
Gandi, Suman, Chinta, Srinivasa Rao, Ojha, Prasanta Kumar, Surendra Babu, Manubolu Surya, Ravuri, Balaji Rao |
| Předmět: |
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| Zdroj: |
Journal of the American Ceramic Society; Jan2018, Vol. 101 Issue 1, p167-177, 11p |
| Abstrakt: |
Na-ion conducting Na1+ x[Sn xGe2− 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%, Na1.5[Sn0.5Ge1.5( PO4)3]) of tetrahedral Ge4+ ions by Sn4+ on Na-Ge-P network. CV studies of the best conducting Na1.5[Sn0.5Ge1.5( 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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