Synthesis of (La0.8Y0.2)PO4: Sm3+, Eu3+, Na+ and kinetics mechanism study with Z(α) master plots method for thermal process of its precursor

Wang, Yinglong; Wen, Jiahao; Wang, Tianman; Wu, Xinke; Cao, Chunfang; Liu, Yang; Liao, Sen; Huang, Yingheng

doi:10.1007/s10973-018-7869-4

Cited by 5 publications

(2 citation statements)

References 38 publications

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“…The most suitable model is determined based on a statistical criterion, i.e. the residual sum of squares (RSS), calculated according to the equation 29, 43 :

RSS goodbreak= \sum {[z {((), α)}_{\exp .} - z {((), α)}_{cal .}]}^{2} goodbreak= \min

After identification of the most probable mechanism function, the values of A can be determined. According to Vyazovkin et al ., 29 the pre‐exponential factor can be calculated from the following equation:

A goodbreak= \frac{- {qE}_{a}}{{RT}_{p}^{2} f^{'} ((), α_{normalp})} \exp ((), \frac{E_{a}}{{RT}_{p}})

where the subscript p is related to the maximum of DTG results obtained at various heating rates and

f^{'} ((), α) = normald f ((), α) / normald α

44 .…”

Section: Methodsmentioning

confidence: 99%

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Thermal stability and non‐isothermal kinetics of poly(ethyl cyanoacrylate) nanofibers

Georgieva

Simeonova

Turmanova

et al. 2022

Polymer International

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A thermogravimetric study of poly(ethyl cyanoacrylate) nanofibers was carried out at five heating rates with a linear increase in the temperature in a nitrogen atmosphere. The data provided by the thermogravimetric study were used to evaluate the kinetics of the degradation process using three isoconversional methods. Considering that the kinetic parameters of the process depend on the reaction mechanism, various approaches were applied in order to determine the most probable mechanism function. In this respect, the mechanism of thermal degradation of poly(ethyl cyanoacrylate) is a phase boundary reaction with cylindrical symmetry (F 0.5 function) as demonstrated by the z(⊍) master plots method, iso-temperature method and isoconversional method. On their basis, the values of the kinetic triplet (E a , A and the shape of the most appropriate f(⊍) function) of the process were obtained, and subsequently the thermodynamic functions of the activated complex formation were calculated. The thermal stability of the polymer was predicted according to the integral procedure decomposition temperature.

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“…The most suitable model is determined based on a statistical criterion, i.e. the residual sum of squares (RSS), calculated according to the equation 29, 43 :

RSS goodbreak= \sum {[z {((), α)}_{\exp .} - z {((), α)}_{cal .}]}^{2} goodbreak= \min

A goodbreak= \frac{- {qE}_{a}}{{RT}_{p}^{2} f^{'} ((), α_{normalp})} \exp ((), \frac{E_{a}}{{RT}_{p}})

where the subscript p is related to the maximum of DTG results obtained at various heating rates and

f^{'} ((), α) = normald f ((), α) / normald α

44 .…”

Section: Methodsmentioning

confidence: 99%

“…The most suitable model is determined based on a statistical criterion, i.e. the residual sum of squares (RSS), calculated according to the equation 29,43 : Thermal stability and non-isothermal kinetics of PECA nanofibers www.soci.org…”

Section: Preparation Of Peca Nanofibers By Vapor-phase Polymerizationmentioning

confidence: 99%

Thermal stability and non‐isothermal kinetics of poly(ethyl cyanoacrylate) nanofibers

Georgieva

Simeonova

Turmanova

et al. 2022

Polymer International

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The multistep decomposition of boric acid

Huber

Jahromy

Birkelbach

et al. 2020

Energy Science & Engineering

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Due to its high potential for thermal energy storage systems (Huber, Setoodeh Jahromy, Jordan, et al, Energies. 2019;12:17) the decomposition of boric acid is of particular interest in the field of applied research. The complexity of the reaction mechanism, with its multiple partial‐overlapping reaction steps, hitherto prevented a clear identification and analysis of each stoichiometric reaction step. So far, various research teams performed different kinetic analyses of boric acid, which led to various reaction mechanisms and stoichiometric reaction steps with yet inconclusive results for process modeling. Thus, a deeper examination of the process was desirable, to validate whether a proposed reaction is reasonable or not. For this purpose, experimental data were used for a deconvolution of the reaction sequence, using the Fraser‐Suzuki function, which clearly revealed the respective single reactions. The results of the deconvolution were compared with the proposed reaction steps in consideration of the stoichiometric ratio and thereby illustrated that the decomposition of polycrystalline boric acid more likely consists of three reaction steps. In contrary to the two‐step mechanism, the three‐step mechanism showed a very good correlation (r > 99%). Based on these outcomes, kinetic analyses were performed for each reaction step, by means of the nonparametric kinetics 2 (NPK2) method with subsequent determination of kinetic parameters. Additionally, for a deeper insight into the reaction, analyzing techniques like X‐ray diffraction (XRD), scanning electron microscopy (SEM) and simultaneous thermal analysis (STA) were applied.

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Enhanced luminescence of a new red phosphor Na13Sr2Ta2(PO4)9:Eu3+ by co-doping charge compensators Li+/Na+/K+

Zhao

Shi

et al. 2020

Journal of Luminescence

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Synthesis of (La0.8Y0.2)PO4: Sm3+, Eu3+, Na+ and kinetics mechanism study with Z(α) master plots method for thermal process of its precursor

Cited by 5 publications

References 38 publications

Thermal stability and non‐isothermal kinetics of poly(ethyl cyanoacrylate) nanofibers

Thermal stability and non‐isothermal kinetics of poly(ethyl cyanoacrylate) nanofibers

The multistep decomposition of boric acid

Enhanced luminescence of a new red phosphor Na13Sr2Ta2(PO4)9:Eu3+ by co-doping charge compensators Li+/Na+/K+

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