Pre-crystallization and crystallization kinetics of some Se-Te-Sb glasses

Moharram, A.H.; Abu-Sehly, A.A.; El-Oyoun, M. Abu; Soltan, A.S.

doi:10.1016/s0921-4526(02)01421-7

Cited by 48 publications

(24 citation statements)

References 21 publications

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“…With the addition of some small particles, the supercooling degree (SD) of water can be greatly reduced [1,2], a finding that might improve the performance of ice storage system. Differential scanning calorimetry (DSC) has been widely used to study properties of materials by probing the thermal behaviours, particularly the phase transition with temperature [3][4][5]. In recent years, it has been applied to the investigation of nanofluids.…”

Section: Introductionmentioning

confidence: 99%

Reduction of supercooling of water by TiO₂ nanoparticles as observed using differential scanning calorimeter

Chen

Jia

et al. 2011

Journal of Experimental Nanoscience

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Aqueous dispersions of Titania nanoparticles were cooled using differential scanning calorimetry (DSC). The nanoparticles reduce the supercooling of water by acceleration of nucleation. The experimental results demonstrated the important role in water crystallisation by the internal surface of the sample holder, and that stable nanofluids are required for the measurements to investigate the effect of nanoparticles on freezing. But for dispersions at low concentrations, such as 0.05 wt% and 0.1 wt%, the starting temperatures of freezing were found to be unusual at the cooling rates of 3 C/min and 4.5 C/min, namely they were even lower than that of the deionised (DI) water. It is found that surface controlled nucleation (SCN) is dominant at low cooling rates, while volumetric controlled nucleation (VCN) is dominant at high cooling rates.

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Section: Introductionmentioning

confidence: 99%

Reduction of supercooling of water by TiO₂ nanoparticles as observed using differential scanning calorimeter

Chen

Jia

et al. 2011

Journal of Experimental Nanoscience

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“…Also across an investigation for Se 80−x Te 20 Sb x (x = 1.5, 7.5, 9). Moharram et al [48] have found that the compositions of larger amounts of Sb have a higher stability. The deduced values of K(T g ) and K(T p ) criteria were calculated using the above mentioned relations given by Eqs.…”

Section: Thermal Stability and The Ability Of Glass Formationmentioning

confidence: 99%

Thermal Stability Criteria of Se_80-xTe₂₀Sb_xin Terms of Characteristic Temperatures and Kinetic Parameters

2015

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Thermal stability in terms of characteristic temperature and kinetic parameters of dierent compositions of glassy Se80−xTe20Sbx (x = 0, 2, 4, 6, 8, 10) have been investigated. Dierential scanning calorimetry under nonisothermal conditions have been proposed to investigate thermal characteristic of these compositions. The thermal stability of these glasses was obtained in terms of various simple quantitative methods based on the characteristic temperatures, such as the glass transition temperature, Tg, the onset temperature of crystallization, Tin, the temperature corresponding to the maximum crystallization rate, Tp, and the melting temperature, Tm. Furthermore, the kinetic parameter Kr(T ) was achieved as another indicator for thermal stability and its results about stability compared with those evaluated by other criteria. The results of both the criteria and the kinetic parameter Kr(T ) conrm that the thermal stability increases with increase of Sb content. The results also refer to that: the glass transition Tg, activation energy of crystallization Ep and the frequency factor K0 were increased with the addition of Sb. These results have been discussed in terms of the average coordination number, cohesive energy and average heat of atomization.

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“…One can see the IReO in a real SEM image, which is interpreted by the authors as "a pre-crystallization stage, in which glass matrix becomes inhomogeneous, forming nano-sized volumes" [25]. Indirect evidence of the IReO is seen in the conclusion that "glass-transition kinetics can be treated as pre-crystallization kinetics" [26] as well as in the models of "dynamic heterogeneity" in an amorphous matrix before its crystallization [27][28][29]. The problem is that both "dynamic heterogeneity" and "initial reorientation" are the only terms that need decoding.…”

Section: Induction Period Transient Effects and Initial Reorientationmentioning

confidence: 99%

Crystallization in Glass Forming Substances: The Chemical Bond Approach

Chechetkina¹

2012

Crystallization - Science and Technology

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Pre-crystallization and crystallization kinetics of some Se-Te-Sb glasses

Cited by 48 publications

References 21 publications

Reduction of supercooling of water by TiO₂ nanoparticles as observed using differential scanning calorimeter

Reduction of supercooling of water by TiO₂ nanoparticles as observed using differential scanning calorimeter

Thermal Stability Criteria of Se_80-xTe₂₀Sb_xin Terms of Characteristic Temperatures and Kinetic Parameters

Crystallization in Glass Forming Substances: The Chemical Bond Approach

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Pre-crystallization and crystallization kinetics of some Se-Te-Sb glasses

Cited by 48 publications

References 21 publications

Reduction of supercooling of water by TiO2 nanoparticles as observed using differential scanning calorimeter

Reduction of supercooling of water by TiO2 nanoparticles as observed using differential scanning calorimeter

Thermal Stability Criteria of Se80-xTe20Sbxin Terms of Characteristic Temperatures and Kinetic Parameters

Crystallization in Glass Forming Substances: The Chemical Bond Approach

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Product

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Reduction of supercooling of water by TiO₂ nanoparticles as observed using differential scanning calorimeter

Reduction of supercooling of water by TiO₂ nanoparticles as observed using differential scanning calorimeter

Thermal Stability Criteria of Se_80-xTe₂₀Sb_xin Terms of Characteristic Temperatures and Kinetic Parameters