Measurements of DSC isothermal crystallization kinetics in amorphous selenium bulk samples

Abu-Sehly, A.A.; Alamri, S.N.; Joraid, A.A.

doi:10.1016/j.jallcom.2008.08.059

Cited by 56 publications

(40 citation statements)

References 18 publications

(21 reference statements)

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“…The marked dominance of the volume crystallization mechanism is certainly a consequence of slow pre-isothermal heating performed at 20°C min -1 . The rapidity of the crystallization process corresponding to the large number of volume-located nuclei can be confirmed by simple comparison with our own data: in [24], it took *3 min to finish the crystallization process at 95°C, while in our present work the crystallization proceeded for 50 min under the same conditions.…”

Section: Comparison With Literature Datasupporting

confidence: 83%

“…Third, in their work [24], Abu-Sehly et al studied isothermal kinetics of melt-quenched a-Se glass in a fine powder form. Strong dependence of the apparent activation energy E on the degree of conversion a and variation of the Avrami exponent m with the annealing temperature (values from 2 to 4 in the 80-100°C range) suggests complex crystallization behavior with a dominating volume-located CNT crystal growth mechanism.…”

Section: Comparison With Literature Datamentioning

confidence: 99%

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Crystallization kinetics of a-Se

Svoboda

Málek

2014

J Therm Anal Calorim

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Differential scanning calorimetry was used to study crystallization behavior in selenium glass under isothermal conditions. In the current work, which is the third in a sequence of articles dealing with the crystallization kinetics of complex processes, the isothermal crystallization kinetics was described in terms of the JohnsonMehl-Avrami nucleation-growth model. The study was performed in dependence on particle size so that the advanced interpretation of characteristic kinetic functions could be employed. The complexity of the crystallization process was found to be represented by overlapping competing surface and bulk nucleation-growth mechanisms. Based on this information, the deconvolution in terms of the Johnson-Mehl-Avrami process was performed, separating the mechanisms involved. High consistency of the resulting kinetic parameters confirms the accuracy and physical meaningfulness of the deconvolution procedure. The resulting concept not only describes the isothermal crystallization process in glassy selenium very well, both qualitatively and quantitatively, but is also capable of explaining all accessible data from the literature on this topic. In addition, comparisons of the present and literature data clearly imply that the nucleation processes play a major role in the isothermal crystallization of amorphous selenium.

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Section: Comparison With Literature Datasupporting

confidence: 83%

Section: Comparison With Literature Datamentioning

confidence: 99%

Crystallization kinetics of a-Se

Svoboda

Málek

2014

J Therm Anal Calorim

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“…where E is the effective activation energy describing the overall crystallization process, n is the growth (Avrami) exponent and K 0 the rate constant, depend on the operating nucleation and growth modes [18,19]. To determine the effective activation energy for crystallization, E c , under isothermal or non-isothermal conditions, Eq.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Glass transition and crystallization kinetics of Inx(Se0.75Te0.25)100−x chalcogenide glasses

Elnaeim¹,

Aly²,

Afify³

et al. 2010

Journal of Alloys and Compounds

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“…Moreover the free Sb atoms could effectively prevent Se atoms from forming a crystal nucleus. Certainly, under high-temperature conditions, the Sb-Se bonds would be converted into a stable crystalline state of the Sb-Se compound with various stoichiometric compositions [20][21][22][23][24][25].…”

Section: à2mentioning

confidence: 99%

“…Kushwaha et al [24] reported that both the photoconductivity and photosensitivity of Se-Sb glass have a discontinuity at 2 and 8 at.% of Sb. Joraid and coworkers [25] measured the activation energy for crystallization of a-Se film, and found the Avrami exponent to be about 2 for an annealing temperature T 361 K. High-field effects and crystallization kinetics have been reported by Kumar and coworkers [26][27][28]. However, little attention has been paid to its X-ray sensitivities [21].…”

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confidence: 99%

Improved thermal stability of antimony‐doped amorphous selenium film for X‐ray flat‐panel detectors

Chen

Dong

et al. 2012

Physica Status Solidi (a)

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Amorphous selenium (a-Se) film is a promising photoconductive material for X-ray flat-panel detectors (FPD) application. However, a-Se tends to be crystalline Se at near room temperature. This remarkable temperature sensitivity limits its practical application. To prevent the near-room-temperature crystallization of a-Se film, we fabricate antimony (Sb)-doped a-Se films using a vacuum evaporation technique equipped with an in situ cooling trap. We experimentally demonstrate that the Sb doping improves the thermal stability of a-Se film while possessing a similar X-ray photoelectric conversion efficiency as the pure a-Se film. After air annealing at 50 8C for 90 min, the X-ray diffraction (XRD) results of the 4.1 at.% Sb-doped a-Se film shows no detectable crystallization diffraction peak. Upon applying an electric field of 10 V mm À1 , such Sb-doped a-Se film exhibits dark current density below 1 nA cm À2, while under an X-ray dosage of about 4 mGy, the annealed Sb-doped a-Se film shows a photocurrent density of more than 100 nA cm À2 .

show abstract

Measurements of DSC isothermal crystallization kinetics in amorphous selenium bulk samples

Cited by 56 publications

References 18 publications

Crystallization kinetics of a-Se

Crystallization kinetics of a-Se

Glass transition and crystallization kinetics of Inx(Se0.75Te0.25)100−x chalcogenide glasses

Improved thermal stability of antimony‐doped amorphous selenium film for X‐ray flat‐panel detectors

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