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D. TSIULYANU1,* , I. STRATAN1
The kinetics of the photodissolution of Ag into S - rich As-S-Ge glassy films of various compositions along the tie-line (GeS4)x (AsS3)1-x (0 ≤ x ≤ 1) has been studied by monitoring the changes that occur in their optical transmission of weakly absorbed broadband light. It was shown that the kinetics profiles comprise two consecutive linear steps followed by a quasi – parabolic tail, but the transitions between these steps are not monotonic. The photodissolution rate and the amount of adopted Ag on the first step were found (except of GeS4) not to depend on glass composition. This result was ascribed to provide evidence for a preferential and direct interaction of Ag with free sulfur at the interface. The rate of photodissolution on the second linear step exhibits a compositional maximum around (GeS4)0.33 (AsS3)0.67, being by two orders of magnitude higher than the rate for GeS4. The diffusion coefficient, determined from the final quasi-parabolic step of the photodissolution, reaches its maximal value k = 3, 5·10-13 cm2s-1 for the same composition, that is (GeS4)0.33 (AsS3)0.67. The revealed compositional dependences are qualitatively attributed to the fact that only some, very specific glassy compositions being Ag photodoped yield a homogeneous material..
Glassy chalcogenides, Photodissolution, Kinetics.
D. TSIULYANU, I. STRATAN, Compositional dependence of Ag photodissolution in S-rich ternary As-S-Ge glassy films, Optoelectronics and Advanced Materials - Rapid Communications, 5, 8, August 2011, pp.851-857 (2011).
Submitted at: June 20, 2011
Accepted at: Aug. 10, 2011
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
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