The local structure of As Se S chalcogenide glasses studied by neutron diffraction and Raman scattering

Alekberov, R. I.; Mekhtiyeva, S. I.; Isayev, A. I.; Fábián, Margit

doi:10.1016/j.jnoncrysol.2017.05.015

Cited by 20 publications

(7 citation statements)

References 28 publications

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“…The ACN can give insight into the dependence of a glass macroscopic property on glass atomic structure and composition and the theoretical, calculated ACN value has been widely applied in the analysis of chalcogenide glasses . The experimental ACN values through neutron diffraction and Reverse Monte Carlo simulations have been proved to match closely to the theoretical ACN values in As–Se and As–Se–S chalcogenide glasses . A larger ACN value normally suggests tighter connectivity of a glass structure .…”

Section: Resultsmentioning

confidence: 91%

“…In a Ge a As b Ga c Se d glass system (a+b+c+d = 1), the coordination number of Ge, As, Ga, and Se is taken as 4, 3, 4, and 2, respectively. It should be noted due to the amorphous nature of the glass, the coordination number of an element can vary from site to site and homopolar bonds (e.g., As–As, Se–Se) can occur . The theoretical ACN value of the Ge a As b Ga c Se d glass system is calculated using the following equation:

ACN = (4 \times (a+c)) + (3 \times b) + (2 \times d)

…”

Section: Resultsmentioning

confidence: 99%

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Low gallium‐content, dysprosium III‐doped, Ge–As–Ga–Se chalcogenide glasses for active mid‐infrared fiber optics

et al. 2018

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A systematic investigation is presented, for the first time, of a 1000 ppmw (parts per million, by weight) Dy 3+ -doped Ge-As-Ga-Se chalcogenide glass series, with a fixed low Ga content of 1 atomic% (at. %), suitable for active mid-infrared fiber optics. Seven glasses constitute the series, which have increasing average coordination number from 2.49 to 2.61, in steps of 0.02, with the GeSe 2 , As 2 Se 3 , and Ga 2 Se 3 stoichiometries kept. Glass formation is confirmed using X-ray diffraction and differential scanning calorimetry. Fourier transform infrared spectroscopy is reported for the series. Parallel plate viscometry enables prediction of fiber-drawing temperatures and, with differential thermal analysis, determines the potential for fiber fabrication. X-ray diffraction of samples after parallel-plate viscometry shows that Ge 25 As 9 Ga 1 Se 65 (at. %) alone, in the glass-series, devitrifies to form the single-crystalline phase: monoclinic-GeSe 2 ; scanning electron microscope imaging suggests that this phase is both surface and bulk grown. Overall, the recommended host glass at. % compositions for doping with rare-earth ions and drawing to active mid-infrared fiber are

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Section: Resultsmentioning

confidence: 91%

ACN = (4 \times (a+c)) + (3 \times b) + (2 \times d)

…”

Section: Resultsmentioning

confidence: 99%

Low gallium‐content, dysprosium III‐doped, Ge–As–Ga–Se chalcogenide glasses for active mid‐infrared fiber optics

et al. 2018

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“…The characteristic peaks of the homopolar bond Ge-Ge in the ethane-like Se 2 Ge=GeSe 2 structure unit appear around 175 cm -1 and 300 cm -1 , respectively [23,[26][27][28]. For chalcogenide glasses As x Se 1-x , the vibration peaks of AsSe 3/2 pyramidal units appear at 230 cm -1 and 268 cm -1 [29][30][31]. The vibration peak at around 247 cm -1 is ascribed to the homopolar bond As-As of the As 4 Se 4 structural unit [32].…”

Section: Resultsmentioning

confidence: 99%

The effect of the structure on the physical properties in GexAs10Se90-x glasses

Xu¹,

Liang²,

Zhu³

2023

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We have prepared a group of GexAs10Se90-x glass(x=5, 10, 15, 20, 25, 30, and 35 at. %) and investigated their structure and physical properties. It was found that, the minimum refractive index and maximum optical bandgap occur in Ge25As10Se65 glass that is chemically stoichiometric. Analysis of Raman spectra of the glasses indicated that the number of the Ge-Ge, As-As, and Se-Se homopolar bonds is closely related to the bandgap, because the band-tails formed by homopolar bonds could reduce the optical bandgap. The transition behavior of the structural units and physical properties of the glasses occurs at the glass with the chemically stoichiometric composition, and thus the chemical composition dominates physical properties of GexAs10Se90-x chalcogenide glasses

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“…1,2 Also the structural arrangement of chalcogenide glasses is still of interest. [3][4][5] One of the important mechanical characteristics of solids is density, which affects various optical, electrical and mechanical properties. Changes in density can signicantly inuence the refractive index of a material as it follows for example, from the Lorentz-Lorenz relation.…”

Section: Introductionmentioning

confidence: 99%

The density, nanohardness and some optical properties of As–S and As–Se chalcogenide bulk glasses and thin films

et al. 2020

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The local structure of As Se S chalcogenide glasses studied by neutron diffraction and Raman scattering

Cited by 20 publications

References 28 publications

Low gallium‐content, dysprosium III‐doped, Ge–As–Ga–Se chalcogenide glasses for active mid‐infrared fiber optics

Low gallium‐content, dysprosium III‐doped, Ge–As–Ga–Se chalcogenide glasses for active mid‐infrared fiber optics

The effect of the structure on the physical properties in GexAs10Se90-x glasses

The density, nanohardness and some optical properties of As–S and As–Se chalcogenide bulk glasses and thin films

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