Influence of Strain Energy on Kinetics of Ion Exchange in Glass | Zendy

VARSHNEYA A. K. | Zendy

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Influence of Strain Energy on Kinetics of Ion Exchange in Glass

Author(s) -

VARSHNEYA A. K.

Publication year - 1975

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.1151-2916.1975.tb19569.x

Subject(s) - electron microprobe , nernst equation , diffusion , alkali metal , ion , analytical chemistry (journal) , ion exchange , microprobe , chemistry , thermodynamics , kinetics , mineralogy , materials science , physics , chromatography , organic chemistry , electrode , quantum mechanics

The kinetics of the K + ⇌ Na + exchange in Na 2 O·3SiO 2 glass at 350°C were studied. The distribution of K in the glass specimens after exchange in molten KNO 3 was determined with an electron microprobe. The calculated interdiffusion coefficients, which varied with the local composition in the glass, were compared with those obtained using the Nernst‐Planck equation and Fleming and Day's self‐diffusion data for xNa 2 O. (1‐x)K 2 O·3SiO 2 glasses. Deviations of the observed interdiffusion coefficient from the Nernst‐Planck formula were noted. These deviations are explained on the basis of changes in the average size of the alkali ion sites and in the strain energy that occur during ion exchange.

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