Kinetic parameters determination in non-isothermal conditions for the crystallisation of a silica-soda-lead glass

Mocioiu, Oana Cătălina; Zaharescu, Maria; Jitianu, G.; Budrugeac, P.

doi:10.1007/s10973-005-7273-8

Cited by 18 publications

(12 citation statements)

References 47 publications

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“…As can be seen, FWO and KAS give similar results in the whole range. Differences between the models come from different approximations of the temperature integral [11].…”

Section: Resultsmentioning

confidence: 99%

“…(5) there should be a straight line (Ln[bg(x)/T 2 ] vs. 1/T) for all heating rates. This will be also used for discrimination of the conversion function [7,11].…”

Section: Pérez-maqueda Et Al Criterionmentioning

confidence: 99%

“…In the literature, the application of the Isokinetic Relationship (IKR) and Invariant Kinetic Parameters (IKP) methods can be found for studying the decomposition of aromatic azomonoethers [7], polymer curing [8], polymerisation of poly(ester amide) potassium salt [9], nickel oxide reduction [10], and the crystallisation of silica-soda-lead glass [11]. However, to the author's knowledge, these methods have not been previously applied to the study of mullite crystallisation in porcelain stoneware.…”

Section: Introductionmentioning

confidence: 99%

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Study of mullite formation in porcelain stoneware applying isoconversional and IKP methods

Pérez

Rincón

Romero

2010

Ceramics International

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The growth process of mullite in a porcelain stoneware body has been studied under isoconversional, isokinetic relationship and invariant kinetic parameters. Activation energy for mullite crystallisation of over 589-628 kJ mol À1 and a Ln A over 50-59 min À1 was obtained. The model was Johnson-Melh-Avrami with n = 1.5. The model chosen implies quick nucleation and subsequent one or three-dimensional growth. Isoconversional methods show an independent activation energy variation in mid range conversion degrees. Lower and higher conversion degrees show different reactions in mullite formation. Results obtained with the methods employed here are in agreement with a previous paper where the Kissinger non-isothermal method and Ligero et al. approximation were applied. #

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“…As can be seen, FWO and KAS give similar results in the whole range. Differences between the models come from different approximations of the temperature integral [11].…”

Section: Resultsmentioning

confidence: 99%

“…(5) there should be a straight line (Ln[bg(x)/T 2 ] vs. 1/T) for all heating rates. This will be also used for discrimination of the conversion function [7,11].…”

Section: Pérez-maqueda Et Al Criterionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of mullite formation in porcelain stoneware applying isoconversional and IKP methods

Pérez

Rincón

Romero

2010

Ceramics International

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“…It was considered that the E values are independent of a if the relative error of the slope of the FWO equation straight line is lower than 10 %. If E value is independent of a, the decomposition may be a simple reaction; otherwise, it is a multistep reaction mechanism [25]. According to the characteristics of the E-a plot of using the FWO methods, the activation energies are 435 kJ mol -1 at beginning and, with increasing mass loss, it drops sharply to 260 kJ mol -1 , then reach a plateau or constant with mean value of E = 227.73 kJ mol -1 , indicating that the reaction proceeds with two stages [26].…”

Section: Friedman-reich-levi (Frl) Methodsmentioning

confidence: 99%

Synthesis, characterization and nonisothermal decomposition kinetics of La2(CO3)3·3.4H2O

Zhang

Wang

et al. 2015

J Therm Anal Calorim

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The single-phase La 2 (CO 3 ) 3 Á3.4H 2 O with the orthorhombic type was synthesized by hydrothermal method. The results characterized by XRD, FTIR and DTA-TG showed that the thermal decompositions of La 2 (CO 3 ) 3 Á3.4H 2 O below 1,273 K experience four steps, which involve a two-stage dehydration and formation of anhydrous La 2 (CO 3 ) 3 at first, and then the formation of La 2 O 2 CO 3 and La 2 O 3 , respectively. An additional intermediate product assigned to La 2 O(CO 3 ) 2 was observed in the third step. Thermal decomposition kinetics of La 2 (CO 3 ) 3 to La 2 O 2 CO 3 was investigated under nonisothermal conditions. The dependence of the activation energy on the reaction degree was estimated by Ozawa and Friedman isoconversional methods, which confirm that the step is a multistage kinetic process. The reaction mechanism determined by a multivariate nonlinear regression program is a kind of two-stage consecutive reaction (A n -A n model), f(a) = n(ln(1 -a (1 -1/n) )(1 -a)). The first stage: E = 435 ± 9 kJ mol -1 , lg A = 28.7 ± 0.8, Dimension1 = 0.28; the second stage: E = 234 ± 4 kJ mol -1 , lg A = 13.5 ± 0.3, Dimension2 = 1.22.

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“…Due to this fact, in the ternary system, the crystallization could be complex and surely depend on the ratio of Na and Pb in the composition. Some attempts to bring information on the matter were realized previously by the authors [21]. Due to the complex crystallization process of the most studied compositions, kinetic calculations were possible for only one glass [21].…”

Section: Introductionmentioning

confidence: 99%

Study of crystallization process of soda lead silicate glasses by thermal and spectroscopic methods

Mocioiu

Zaharescu

Atkinson

et al. 2014

J Therm Anal Calorim

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The crystallization process of some glasses in the ternary Na 2 O-SiO 2 -PbO system with good chemical stability that can be used for waste inertization was studied using X-ray diffraction (XRD), infrared spectroscopy (FT-IR), differential thermal analysis (DTA) and scanning electron microscopy. The parent glasses were characterized by XRD and FT-IR, and their vitreous state was determined. DTA measurements evidenced glass transition (T g ) and crystallization temperatures (T c ). The thermal treatments were conducted at vitreous transition temperature (400°C) and at highest effect of crystallization (650°C). XRD evidenced the lead and sodium silicate crystalline phases in samples treated at 650°C for 12 h. Micrometer crystallites dispersed in the glass matrices have affected the transparence of glasses and made them opaque after treatment at 650°C. The influence of oxide quantities in compositions on the crystallization tendency was revealed. A PbO higher content than that of SiO 2 as well as lower Na 2 O content decreased the tendency of crystallization.

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Kinetic parameters determination in non-isothermal conditions for the crystallisation of a silica-soda-lead glass

Cited by 18 publications

References 47 publications

Study of mullite formation in porcelain stoneware applying isoconversional and IKP methods

Study of mullite formation in porcelain stoneware applying isoconversional and IKP methods

Synthesis, characterization and nonisothermal decomposition kinetics of La2(CO3)3·3.4H2O

Study of crystallization process of soda lead silicate glasses by thermal and spectroscopic methods

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