The comparative kinetic analysis of the non-isothermal crystallization process of Eu3+ doped Zn2SiO4 powders prepared via polymer induced sol–gel method

Marinović‐Cincović, Milena; Janković, Bojan; Milićević, Bojana; Antić, Željka; Whiffen, Radenka Krsmanović; Dramićanin, Miroslav D.

doi:10.1016/j.powtec.2013.09.020

Cited by 23 publications

(9 citation statements)

References 73 publications

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“…Both functions show similar shapes for the dependence on the heating rate β. This behaviour of y(α) and z(α) curves with varying of β indicates the characteristic of complex kinetic crystallization [23]. The y(α) function shows an obvious high-α side shoulder suggesting the growth of crystallization is three-dimensional growth from bulk nuclei [24].…”

Section: Crystallization Kineticsmentioning

confidence: 78%

Glass transition and crystallization kinetics of a new chalcogenide-alkali metal $$\hbox {Se}_{80}\hbox {Te}_{8}(\hbox {NaCl})_{12}$$ Se 80 Te 8

et al. 2019

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A new chalcogenide-alkali metal alloy of Se 80 Te 8 (NaCl) 12 has been prepared by a melt-quench technique. The crystallized phases due to the thermal annealing are observed by X-ray diffraction of the powdered sample. The glass transition and kinetics of crystallization in the Se 80 Te 8 (NaCl) 12 alloy are studied using the differential scanning calorimetric technique under non-isothermal conditions. The activation energy of the glass transition is evaluated by Kissinger and Mahadevan methods. The crystallization activation energy (E c) is calculated by isoconversion Friedman methods. The decrease of E c with increasing crystallization conversion is attributed to the complex mechanism of the crystallization process. Based on the shape of the characteristic kinetic function, the crystallization growth is found to be a three-dimensional growth from the bulk nuclei. The results show that the conditions of the Sestak-Berggren model are satisfied for describing the crystallization process of the studied Se 80 Te 8 (NaCl) 12 alloy. The parameters M and N involved in this model are calculated and related to the crystallization process.

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Section: Crystallization Kineticsmentioning

confidence: 78%

Glass transition and crystallization kinetics of a new chalcogenide-alkali metal $$\hbox {Se}_{80}\hbox {Te}_{8}(\hbox {NaCl})_{12}$$ Se 80 Te 8

et al. 2019

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“…Additionally, more structured shape of TG/DTA curves shows that thermal behavior of sol-gel derived materials is more complex compared to mixed metal-citric acid ones. According to our previous study on the crystallization of phosphor materials prepared by sol-gel method [25], one should expect that materials crystallize in a two-step process. In the primary crystallization stage nonconstant radial growth rate is present, while in the second stage twodimensional crystal growth occurs.…”

Section: Resultsmentioning

confidence: 99%

Sol‐Gel Derived Eu³⁺‐Doped Gd₂Ti₂O₇ Pyrochlore Nanopowders

Ćulubrk

Antić

Lojpur

et al. 2015

Journal of Nanomaterials

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Herein we presented hydrolytic sol-gel synthesis and photoluminescent properties of Eu3+-doped Gd2Ti2O7pyrochlore nanopowders. According to Gd2Ti2O7precursor gel thermal analysis a temperature of 840°C is identified for the formation of the crystalline pyrochlore phase. Obtained samples were systematically characterized by powder X-ray diffraction, scanning and transmission electron microscopy, and photoluminescence spectroscopy. The powders consist of well-crystalline cubic nanocrystallites of approximately 20 nm in size as evidenced from X-ray diffraction. The scanning and transmission electron microscopy shows that investigated Eu3+-doped Gd2Ti2O7nanopowders consist of compact, dense aggregates composed entirely of nanoparticles with variable both shape and dimension. The influence of Eu3+ions concentration on the optical properties, namely, photoluminescence emission and decay time, is measured and discussed. Emission intensity as a function of Eu3+ions concentration shows that Gd2Ti2O7host can accept Eu3+ions in concentrations up to 10 at.%. On the other hand, lifetime values are similar up to 3 at.% (~2.7 ms) and experience decrease at higher concentrations (2.4 ms for 10 at.% Eu3+). Moreover, photoluminescent spectra and lifetime values clearly revealed presence of structural defects in sol-gel derived materials proposing photoluminescent spectroscopy as a sensitive tool for monitoring structural changes in both steady state and lifetime domains.

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“…Thus, it can be concluded that the JMA model is not appropriate for the study of crystallization kinetics for the alloy under investigation. Also, the general results αp ∞ values are lower than 0.632 indicating a complicated and accelerated crystallization techniques [66]. Such crystallization behavior could be particularly characteristic in the evidential SB (M, N) method.…”

Section: The Validity Of Jma or Sb Modelmentioning

confidence: 89%

“…Such crystallization behavior could be particularly characteristic in the evidential SB (M, N) method. M and N are two main parameters that identify the unique influence of the accelerator and decomposition components of the crystallization operating [66]. The mentioned two parameters are computed in terms of M …”

Section: The Validity Of Jma or Sb Modelmentioning

confidence: 99%

Pre-Crystallization Criteria and Triple Crystallization Kinetic Parameters of Amorphous–Crystalline Phase Transition of As40S45Se15 Alloy

Alzaid

Salam

Qasem

et al. 2021

J Inorg Organomet Polym

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This framework focuses mainly on a detailed study of the pre-crystallization criteria that characterize the As40S45Se15 glassy alloy in various heating rates ranging from 5 to 40 (K/min.) by DSC thermo-grams in the range of (300-575 K). These criteria aim to clarify the relationship of the tendency of glass-forming by the heating rate for the investigated glassy alloy. As well, the present framework demonstrates the criteria of thermal stability.Continuously, the various nucleation and growth pathways. The transformation in activation energy with the volume of the crystalline portion was deduced and, through this, we were able to determine the surface resistance of the analyzed bulk alloy in the crystallization region. The crystalline structure of the study sample was recognized by X-ray diffraction (XRD) and electron scanning microscope (SEM).

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The comparative kinetic analysis of the non-isothermal crystallization process of Eu3+ doped Zn2SiO4 powders prepared via polymer induced sol–gel method

Cited by 23 publications

References 73 publications

Glass transition and crystallization kinetics of a new chalcogenide-alkali metal $$\hbox {Se}_{80}\hbox {Te}_{8}(\hbox {NaCl})_{12}$$ Se 80 Te 8

Glass transition and crystallization kinetics of a new chalcogenide-alkali metal $$\hbox {Se}_{80}\hbox {Te}_{8}(\hbox {NaCl})_{12}$$ Se 80 Te 8

Sol‐Gel Derived Eu³⁺‐Doped Gd₂Ti₂O₇ Pyrochlore Nanopowders

Pre-Crystallization Criteria and Triple Crystallization Kinetic Parameters of Amorphous–Crystalline Phase Transition of As40S45Se15 Alloy

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The comparative kinetic analysis of the non-isothermal crystallization process of Eu3+ doped Zn2SiO4 powders prepared via polymer induced sol–gel method

Cited by 23 publications

References 73 publications

Glass transition and crystallization kinetics of a new chalcogenide-alkali metal $$\hbox {Se}_{80}\hbox {Te}_{8}(\hbox {NaCl})_{12}$$ Se 80 Te 8

Glass transition and crystallization kinetics of a new chalcogenide-alkali metal $$\hbox {Se}_{80}\hbox {Te}_{8}(\hbox {NaCl})_{12}$$ Se 80 Te 8

Sol‐Gel Derived Eu3+‐Doped Gd2Ti2O7 Pyrochlore Nanopowders

Pre-Crystallization Criteria and Triple Crystallization Kinetic Parameters of Amorphous–Crystalline Phase Transition of As40S45Se15 Alloy

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Sol‐Gel Derived Eu³⁺‐Doped Gd₂Ti₂O₇ Pyrochlore Nanopowders