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Effects of M 3+ Ions on the Conductivity of Glasses and Glass‐Ceramics in the System Li 2 O—M 2 O 3 —GeO 2 —P 2 O 5 (M = Al, Ga, Y, Dy, Gd, and La)
Author(s) -
Fu Jie
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01319.x
Subject(s) - ion , materials science , conductivity , ceramic , ionic radius , ionic conductivity , analytical chemistry (journal) , phase (matter) , glass ceramic , lanthanide , mineralogy , chemistry , composite material , electrolyte , electrode , chromatography , organic chemistry
Glasses with compositions Li 1.2 M 0.2 Ge 1.8 (PO 4 ) 3 (M = Al, Ga, Y, Gd, Dy, and La) were prepared and converted to glass‐ceramics by heat treatment. The effects of the M 3+ ions on the conductivity of the glasses and glass‐ceramics were studied. The main phase present in the glass‐ceramics was the conductive phase LiGe 2 (PO 4 ) 3 . Al 3+ and Ga 3+ ions entered the LiGe 2 (PO 4 ) 3 structure by replacing Ge 4+ ions, but lanthanide ions did not. The glass‐ceramics exhibited much higher conductivity than the glasses. With increased ionic radius of the M 3+ ions, the conductivity remained almost unchanged at ∼3 × 10 −12 S/cm for the glasses, but it decreased from 1.5 × 10 −5 to 8 × 10 −9 S/cm for the glass‐ceramics at room temperature. The higher conductivity for Al 3+ ‐ and Ga 3+ ‐containing glass‐ceramics was suggested to result from the substitutions of Al 3+ and Ga 3+ ions for Ge 4+ ions in the LiGe 2 (PO 4 ) 3 structure.