Compositional dependence of thermal stability, glass-forming ability and fragility index in some Se–Te–Sn glasses

Lafi, Omar A.; Imran, Mousa M.A.

doi:10.1016/j.jallcom.2011.01.150

Cited by 50 publications

(19 citation statements)

References 55 publications

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“…Note that both the density and molar volume generally show opposite behavior to each other, but in the present investigation the molar volume data for the studied glasses are observed also to increase as the Bi 2 O 3 increases except for the sample containing 15 % Bi 2 O 3 . This behavior has been observed by several authors for other systems of glasses [35,36]. The behavior of molar volume in glass depends on structural changes and the formation of nonbridging oxygens (NBOs).…”

Section: Density and Molar Volumesupporting

confidence: 65%

“…The values of glass transition temperature, T g and crystallization temperature, T c can be determined from the DTA curve as described in reference [36]. The values of the characteristic temperatures, T g , T c , T p (maximum crystallization Table 2 and the glass transition temperature, T g is observed to decrease with increasing the Bi 2 O 3 content except for the BiB5 sample.…”

Section: Differential Thermal Analysis (Dta)mentioning

confidence: 99%

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The Effects of Bi2O3 on Optical, FTIR and Thermal Properties of SrO-B2O3 Glasses

Hammad

Marzouk

ElBatal

2015

Silicon

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Combined optical and FTIR were measured for binary bismuth borate glass together with samples containing 2.5 -15 mol % Bi 2 O 3 glasses to justify the role of bismuth (Bi 3+ ) ions on the spectral properties. The density and molar volume values were calculated to obtain some insight on the compactness and structural arrangement in the network. DTA measurements were carried out to calculate the thermal transition parameters of the studied glasses and to justify their stability. Optical spectra reveal three strong UV-near visible absorption bands at 250, 275 and 310 nm due to collective absorption of trace iron (Fe 3+ ) ions impurities together with absorption from Bi 3+ ions at 360 nm. The absorption edges reveal an obvious increase with the Bi 2 O 3 content. FTIR spectra reveal vibrational bands characteristic for triangular borate groups at 1200-1600 cm −1 , tetrahedral borate groups at 800 -1200 cm −1 together with interference of Bi-O vibrations upon the introduction of Bi 2 O 3 . The observed bands at about 429, 465, and 595 cm −1 are related to BiO 6 and the band at 879 cm −1 is related to BiO 3 in the host sample 15 % Bi 2 O 3 . Thermal properties are found to depend on the Bi 2 O 3 content depending on the specific role of the formed groups (BiO 6 , BO 3 ) and their function as modifier or former together with the formation of nonbridging oxygens.

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Section: Density and Molar Volumesupporting

confidence: 65%

Section: Differential Thermal Analysis (Dta)mentioning

confidence: 99%

The Effects of Bi2O3 on Optical, FTIR and Thermal Properties of SrO-B2O3 Glasses

Hammad

Marzouk

ElBatal

2015

Silicon

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“…According to the value of fragility index, m, glass forming liquid can be classified into two categories: strong liquid and fragile liquid. [15][16][17] The fragility index 'm' which is a measure of the rate at which the relaxation time decreases with increasing temperature around T g and is given by 18 .…”

Section: Different Methods To Evaluate Activation Energy E Using T Gmentioning

confidence: 99%

STUDY OF GLASS TRANSITION KINETICS FOR Co₆₆Si₁₂B₁₆Fe₄Mo₂ METALLIC GLASS

Patel

Pratap

2013

Int. J. Mod. Phys. Conf. Ser.

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Metallic glasses have received considerable attention in comparison to normal metallic materials due to their superior physical, mechanical, electrical and magnetic properties. Understanding the glass transition kinetics of metallic alloys is of great importance in order to know its thermal stability. In the present paper, kinetics of glass transition of metallic glass Co 66 Si 12 B 16 Fe 4 Mo 2 is studied using thermal analysis technique, i.e. differential scanning calorimetry (DSC), by nonisothermal heating of the sample at four different heating rates. The activation energy (E) of the glass transition region is determined by two most frequently used methods, namely, Moynihan's method and Kissinger's equation. The fragility index, m is also calculated using T g , which is a measure of glass forming ability of the given system. The results show that the fragility index 'm' of the given system falls below 16. This clearly indicates that the given system is strong liquid with excellent glass forming ability (GFA).

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“…According to Angell [61][62] , glass-forming liquids can be classified into strong and fragile liquids, depending on their fragility. The upper and lower limits of parameter are theoretically estimated between 16 for 'strong' systems and 200 for 'fragile' systems 63 . The alloys obtained are strong systems with high glass forming ability.…”

Section: Resultsmentioning

confidence: 99%

“…The kinetic fragility index is recently used to know whether an alloy will present high or low GFA 63 . Since elastic moduli can be potentially correlated to a wide range of physical, mechanical and thermal properties in BMGs, the way the database has been used here may be considered a starting point for how it can be implemented in future studies.…”

Section: N° Alloy Reported Composition Predicted Composition %Packmentioning

confidence: 99%

Composition, Elastic Property and Packing Efficiency Predictions for Bulk Metallic Glasses in Binary, Ternary and Quaternary Systems

et al. 2016

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The results of database based on the efficiency packed model for metallic glasses. The database contains the atomic radii information as well as elastic properties of the most commonly used alloying elements, permitting composition, packing efficiency and elastic property predictions to be made for binary, ternary and quaternary bulk metallic glasses. Twenty different alloys per system (binary, ternary and quaternary) experimentally reported in the literature were compared with those estimated by the database. Comparison charts and diagrams showed good agreement between the composition predictions and those reported from the experimentally processed metallic glasses. The elastic properties predictions could be used to elaborate Blackman diagrams in order to know, in advance, the intrinsic toughness that the investigated alloys might present. The database is intended for designing bulk metallic glasses. Finally, some quaternary alloys were experimentally produced based on the prediction obtained with the database, showing a glassy phase. The microhardness values obtained experimentally of the Zr

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Compositional dependence of thermal stability, glass-forming ability and fragility index in some Se–Te–Sn glasses

Cited by 50 publications

References 55 publications

The Effects of Bi2O3 on Optical, FTIR and Thermal Properties of SrO-B2O3 Glasses

The Effects of Bi2O3 on Optical, FTIR and Thermal Properties of SrO-B2O3 Glasses

STUDY OF GLASS TRANSITION KINETICS FOR Co₆₆Si₁₂B₁₆Fe₄Mo₂ METALLIC GLASS

Composition, Elastic Property and Packing Efficiency Predictions for Bulk Metallic Glasses in Binary, Ternary and Quaternary Systems

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Compositional dependence of thermal stability, glass-forming ability and fragility index in some Se–Te–Sn glasses

Cited by 50 publications

References 55 publications

The Effects of Bi2O3 on Optical, FTIR and Thermal Properties of SrO-B2O3 Glasses

The Effects of Bi2O3 on Optical, FTIR and Thermal Properties of SrO-B2O3 Glasses

STUDY OF GLASS TRANSITION KINETICS FOR Co66Si12B16Fe4Mo2 METALLIC GLASS

Composition, Elastic Property and Packing Efficiency Predictions for Bulk Metallic Glasses in Binary, Ternary and Quaternary Systems

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Product

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STUDY OF GLASS TRANSITION KINETICS FOR Co₆₆Si₁₂B₁₆Fe₄Mo₂ METALLIC GLASS