A topological phase transition in ternary chalcogenide films

Skordeva, E.; Arsova, D.

doi:10.1016/0022-3093(95)00422-x

Cited by 64 publications

(25 citation statements)

References 14 publications

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“…The error in the density measurement, and consequently in the compactness, has been estimated to be less than ±1 %. The compactness, d, has been calculated using the formula [20][21][22] …”

Section: Experimental Methodsmentioning

confidence: 99%

Analysis of chemical ordering and fragility for Ge–Se–In glasses

et al. 2015

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Decreasing the band gap of a material due to metal impurities has been approved through several studies, and this subject is considered as a major area of interest within the optoelectronic applications. Indium-based chalcogenides have been considered good candidates in nonlinear optics due to their ability to transmit in the infrared region. Hence, Ge 18 Se 82 has been alloyed with In. The nature of the chemical ordering of amorphous samples of Ge 18 Se 82-x In x (x = 0, 2, 4 and 6) have been systematically studied. The aim of present investigation is to understand the role of chemical composition and meancoordination number in determining their structural and physical properties. The compactness, d, of alloyed samples has been calculated from their measured densities, and values obtained have been interpreted using the topological model proposed to describe the atomic arrangements in these alloys. The variation of the glass transition temperature, T g , with the average coordination number, Z, has been investigated. The compositional dependence of the mean atomic volume, V m , has also been determined. The free volume percentage, FVP, in Ge 18 Se 82-x In x amorphous samples and their fragility indices, m, have been determined to examine the relationship with the mean-coordination number. We have also analyzed the obtained results on the basis of average single bond energy and electronegativity.

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Section: Experimental Methodsmentioning

confidence: 99%

Analysis of chemical ordering and fragility for Ge–Se–In glasses

et al. 2015

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“…Increasing the GeS 2 content in the glass matrix is accompanied by the compactness decrease (owing to the decompressing of the covalent linked network of As 2 S 3 -based pyramidal units by two structurally inconsistent GeS 2 forms) [10]. As a result, the relaxation processes decay too (see Table 1).…”

Section: Eevmentioning

confidence: 99%

On the problem of relaxation for radiation-induced optical effects in some ternary chalcogenide glasses

Butkiewicz

Golovchak²,

Kovalskiy³

et al. 2001

Radiation Effects and Defects in Solids

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Abstract.We have investigated the influence of high-energy γ-irradiation on the optical transmission spectra of ternary Ge-As-S chalcogenide glasses of the stoichiometric As 2 S 3 -GeS 2 and non-stoichiometric As 2 S 3 -Ge 2 S 3 systems. A long-wave shift of the fundamental absorption edge is observed for all glasses. Two different components of radiation-induced changes were specified: static (residual) and dynamic (time dependent) ones. The dynamic component is mathematically described by the exponential and power functions in respect to post-irradiation periods. It is shown that quantitative features of the observed self-restoration phenomena in the irradiated glasses are closely related to their chemical compositions and stoichiometry.

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“…However, the time constant s decreases in both systems, while g 0 amplitude increases with Z for (As 2 S 3 ) x (GeS 2 ) 1Àx and decreases for (Sb 2 S 3 ) x (GeS 2 ) 1Àx ChG. At the same time, the anomalous compositional character is observed in the dependence of g 0 and s parameters for non-stoichiometric (As 2 S 3 ) x (Ge 2 S 3 ) 1Àx ChG, the extremal values of these parameters being observed near Z % 2.7. As it was shown previously, this anomalous compositional behavior is observed not only in radiation-optical, but other chemical-physical properties of the investigated ChG too [5,6,9].…”

Section: Resultsmentioning

confidence: 65%

“…Then they were cut into plates about 1-2 mm in thickness and 10-15 mm in diameter, the sample surfaces being polished to optical quality with 1 lm alumina. The value of free volume per one atom of glass matrix V A o calculated for each ChG composition using known data [5,6] was chosen to develop an adequate interpretation for the observed relaxation phenomena.…”

Section: Methodsmentioning

confidence: 99%