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Mixed‐Alkali Effect in the Dilute Foreign‐Alkali Region. Failure of the Strong Electrolyte/Cationic Interaction Model
Author(s) -
MOYNIHAN C. T.,
SAAD N. S.,
TRAN D. C.,
LESIKAR A. V.
Publication year - 1980
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.1151-2916.1980.tb10212.x
Subject(s) - alkali metal , electrolyte , relaxation (psychology) , chemistry , ion , cationic polymerization , conductivity , inorganic chemistry , electrical resistivity and conductivity , electric field , analytical chemistry (journal) , chromatography , physics , organic chemistry , psychology , social psychology , electrode , quantum mechanics
Electrical conductivity and relaxation data were measured for glasses of composition 0.242[ X K 2 O+(1‐ X )Na 2 O]‐0.758SiO 2 from 25° to 205°C and in the dilute Na + ion composition range X = 0.9 to 1. The decrease in electrical conductivity σ when the majority alkali K + is replaced with the foreign alkali Na + is most rapid in the very dilute range X = 0.98 to 1 and becomes less rapid at larger Na + contents. The electric field relaxation times agree well with the single‐alkali mechanical relaxation times. The electric field relaxation function becomes more exponential with increasing foreign alkali content, indicating a corresponding decrease in the concentration of mobile ions. Attempts to account for the decrease in σ with increasing foreign alkali content by assuming that the single‐alkali glass is a strong electrolyte and that the foreign alkali complexes with and immobilizes the majority alkali were unsuccessful. Calculated values of the number of majority alkali ions complexed by a foreign‐alkali ion were unreasonably large.