Ionic-to-Electronic Conductivity Crossover in CdTe–AgI–As2Te3 Glasses: An 110mAg Tracer Diffusion Study

Conductivity isotherms of (CdTe) x (AgI)0.5–x/2(As2Te3)0.5–x/2 glasses (0.0 ≤ x ≤ 0.15) reveal a nonmonotonic behavior with increasing CdTe content reminiscent of mixed cation effect in oxide and chalcogenide glasses. Nevertheless, the apparent similarity appears to be partly incorrect. Using 110mAg...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2018-04, Vol.122 (14), p.4179-4186
Main Authors: Kassem, M, Alekseev, I, Bokova, M, Le Coq, D, Bychkov, E
Format: Article
Language:English
Subjects:
Chemical Sciences
Material chemistry
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Summary:Conductivity isotherms of (CdTe) x (AgI)0.5–x/2(As2Te3)0.5–x/2 glasses (0.0 ≤ x ≤ 0.15) reveal a nonmonotonic behavior with increasing CdTe content reminiscent of mixed cation effect in oxide and chalcogenide glasses. Nevertheless, the apparent similarity appears to be partly incorrect. Using 110mAg tracer diffusion measurements, we show that semiconducting CdTe additions produce a dual effect: (i) decreasing the Ag+ ion transport by a factor of ≈200 with a simultaneous increase of the diffusion activation energy and (ii) increasing the electronic conductivity by 1.5 orders of magnitude. Consequently, the conductivity minimum at x = 0.05 reflects an ionic-to-electronic transport crossover; the silver-ion transport number decreases by 3 orders of magnitude with increasing x.
ISSN:1520-6106
1520-5207
DOI:10.1021/acs.jpcb.8b00739