Ionic conductivity in glass and glass-ceramics of the Na/sub 3/YSi/sub 4/O/sub 12/ type materials

Journal Article · Fri Nov 01 04:00:00 EST 1985 · J. Electrochem. Soc.; (United States)

DOI:https://doi.org/10.1149/1.2113635· OSTI ID:6119443

Banks, E; Kim, C H

The ionic conductivities in glass and glass-ceramics were studied for Na /SUB 3.2/ M /SUB 0.7/ Si /SUB 2.9/ P /SUB 0.1/ O /SUB 8.7/ (M = Er, Y, Ho, Dy, Gd, Eu, and Sm) compounds. The results showed comparable conductivity values, in the range of 10/sup -4/ (..mu..-cm)/sup -1/ at 280/sup 0/C, with the glasses being somewhat better conductors. Compounds of the type Na/sub 5/MSi/sub 4/O/sub 12/ (M = Fe, In, Er, Y, Gd, and Sm), which yielded highly conductive phases in the crystalline ceramic form, were also studied in glassy and glass-ceramic states. In compositions of the latter type, the glasses showed lower conductivity than that in the glass-ceramic or the conventional ceramic phase. However, glass-ceramic samples with M = Er, Y showed lower activation energies (4.0-4.4 kcal/mol) compared with those in the conventional crystalline phase prepared by Shannon et al. (1) The greater conductivity of the glass-ceramic state in the Na/sub 5/MSi/sub 4/O/sub 12/ phases, compared to the glassy state, is understood in terms of the favorable structure for ionic transport in the crystalline state.

• Research Organization: Department of Chemistry, Polytechnic Institute of New York, Brooklyn, NY
• OSTI ID: 6119443
• Journal Information: J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Journal Issue: 11 Vol. 132:11; ISSN JESOA
• Country of Publication: United States
• Language: English

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