Studies of amorphous GeSeTe alloys (I): Preparation and calorimetric observations

Sarrach, Donald J.; Neufville, J.P. de; Haworth, W. L.

doi:10.1016/0022-3093(76)90057-0

Cited by 166 publications

(58 citation statements)

References 41 publications

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“…To investigate this possibility, the MYEGA model (Mauro et al, 2009) FIGURE 4 | The dependence of the glass transition temperature Tg for the GexSe 1− x system, as measured using a variety of methods, on the composition x and mean coordination numbern = 2(1 + x). The results obtained from the total heat flow in the present work are compared to the results obtained by Avetikyan and Baidakov (1972), Awasthi and Sampath (2002), Azoulay et al (1975), Bhosle et al (2012a,b), Boolchand (2000), Boolchand and Bresser (2000), Bureau et al (2003), Dembovskii et al (1965), Feltz and Lippmann (1973), Feltz et al (1983), Feng et al (1997, Gueguen et al (2011), Guin et al (2002a, Gulbiten et al (2013), Lucas et al (2003), Nemilov (1964), Ota et al (1978), Sarrach et al (1976), Senapati and Varshneya (1996), Sharma et al (2005), Sreeram et al (1991a), Svoboda and Málek (2015), Wagner et al (1997), Wang et al (2005), Yang et al (2013), and Zhao et al (2013). The inset shows solely the results for Tg,rev as obtained in the present work and in the work of Boolchand and coworkers (Feng et al, 1997;Boolchand, 2000;Boolchand and Bresser, 2000;Wang et al, 2005;Bhosle et al, 2012a,b)-see Section 3.1 for details.…”

Section: Viscosity and Fragility Indexsupporting

confidence: 58%

Topological Ordering and Viscosity in the Glass-Forming Ge–Se System: The Search for a Structural or Dynamical Signature of the Intermediate Phase

et al. 2017

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The topological ordering of the network structure in vitreous Ge x Se 1−x was investigated across most of the glass-forming region (0 ≤ x ≤ 0.4) by using high-resolution neutron diffraction to measure the Bhatia-Thornton number-number partial structure factor. This approach gives access to the composition dependence of the mean coordination number n and correlation lengths associated with the network ordering. The thermal properties of the samples were also measured by using temperature-modulated differential scanning calorimetry. The results do not point to a structural origin of the so-called intermediate phase, which in our work is indicated for the composition range 0.175(8) ≤ x ≤ 0.235(8) by a vanishingly small non-reversing enthalpy near the glass transition. The midpoint of this range coincides with the mean-field expectation of a floppy-to-rigid transition at x = 0.20. The composition dependence of the liquid viscosity, as taken from the literature, was also investigated to look for a dynamical origin of the intermediate phase, using the Mauro-YueEllison-Gupta-Allan (MYEGA) model to estimate the viscosity at the liquidus temperature. The evidence points to a maximum in the viscosity at the liquidus temperature, and a minimum in the fragility index, for the range 0.20 ≤ x ≤ 0.22. The utility of the intermediate phase as a predictor of the material properties in network glass-forming systems is discussed.

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Section: Viscosity and Fragility Indexsupporting

confidence: 58%

Topological Ordering and Viscosity in the Glass-Forming Ge–Se System: The Search for a Structural or Dynamical Signature of the Intermediate Phase

et al. 2017

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“…1(c) shows the DTA curve of a typical ÔpoorÕ glass, Ge 15 As 15 -Se 29 Te 41 , which in this case exhibits two crystallisation peaks. Such multiple T c phenomena, and even double T g implying liquid-liquid phase separation, have also been observed in the parent ternary phase diagram Ge-As-Te [17] when special measures were taken to destabilise the glasses. Fig.…”

Section: Resultsmentioning

confidence: 88%

Glass formation in the Te-enriched part of the quaternary Ge–As–Se–Te system and its implication for mid-infrared optical fibres

Tikhomirov

Furniss

Seddon

et al. 2004

Infrared Physics & Technology

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“…It is known that the optical gap of amorphous semiconductor alloys strongly depends on the average bond energy [21]. According to the CON model and in chalcogen rich alloys, as in our case, the relative fraction of Ge-S, Bi-S, and S-S bonds, expected to exist in the structure of Ge x S y Bi z alloys, are given [22,23] by…”

Section: Methodsmentioning

confidence: 98%

Optical band gap in relation to the average coordination number in Ge—S—Bi thin films

Saffarini

Schmitt

Shanak

et al. 2003

Physica Status Solidi (b)

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Chalcogenide glasses belonging to the Ge x S 94 -x Bi 6 system (14 ≤ x ≤ 28.33 at%) have been prepared from high purity constituent elements. Thin films of the same materials have been deposited by vacuum thermal evaporation. Optical absorbance measurements have been performed on the as-deposited films. The allowed optical transition is found to be indirect and the corresponding optical gaps, E g , are determined. The variation of E g with the average coordination number, 〈r〉, is also investigated. The observed E g -〈r〉 dependence is discussed on the basis of the chemical bonding between the constituents and the rigidity percolation threshold behavior of the network.

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Studies of amorphous GeSeTe alloys (I): Preparation and calorimetric observations

Cited by 166 publications

References 41 publications

Topological Ordering and Viscosity in the Glass-Forming Ge–Se System: The Search for a Structural or Dynamical Signature of the Intermediate Phase

Topological Ordering and Viscosity in the Glass-Forming Ge–Se System: The Search for a Structural or Dynamical Signature of the Intermediate Phase

Glass formation in the Te-enriched part of the quaternary Ge–As–Se–Te system and its implication for mid-infrared optical fibres

Optical band gap in relation to the average coordination number in Ge—S—Bi thin films

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