Determination of the avrami exponent by non-isothermal analyses

Harnisch, Karsten; Lanzenberger, R.

doi:10.1016/0022-3093(82)90083-7

Cited by 33 publications

(7 citation statements)

References 12 publications

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“…The non-integral value of n for LiNbO 3 crystallization may be attributed to the coexistence of surface and bulk crystallization, and also because of the consequence of several complex processes occurring at the growth of a particular phase. 24 However, the n (close to 3) value observed in the present study indicates the near three-dimensional growth of LiNbO 3 . Based on Eq.…”

Section: Resultssupporting

confidence: 50%

Crystallization Kinetics of the LiBO₂–Nb₂O₅ Glass Using Differential Thermal Analysis

Prasad

Varma

2005

Journal of the American Ceramic Society

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The crystallization kinetics in the glass system (100−x)LiBO2−xNb2O5 (5≤x≤20, in molar ratio) prepared via the conventional metal‐plate quenching technique have been studied by isothermal and non‐isothermal methods using differential thermal analyses. X‐ray powder diffraction studies carried out on heat‐treated (500°C) glasses reveal the evolution of lithium niobate crystalline phase along with a minor phase of LiBO2. The exponent n in the Jhonson–Mehl–Avrami (JMA) equation applied to the isothermal process is 2.62, which is in excellent agreement with that obtained under the non‐isothermal process (2.67). The activation energies for crystal growth obtained from JMA equation under isothermal condition, modified Ozawa and Kissinger equations under non‐isothermal conditions, are 293, 311, and 306 kJ/mol, respectively.

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Section: Resultssupporting

confidence: 50%

Crystallization Kinetics of the LiBO₂–Nb₂O₅ Glass Using Differential Thermal Analysis

Prasad

Varma

2005

Journal of the American Ceramic Society

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“…16,17 The nonintegral value of n for MgTi 2 O 5 indicates that the growth of the MgTi 2 O 5 crystals involves several complex processes. 31,32 Values of ln k have been determined for successive temperatures from Figs. 4 and 5.…”

Section: (1) Isothermal Methodsmentioning

confidence: 99%

Differential Thermal Analysis on the Crystallization Kinetics of K₂O‐B₂O₃‐MgO‐Al₂O₃‐SiO₂‐TiO₂‐F Glass

Cheng

Wan

Liang

1999

Journal of the American Ceramic Society

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The crystallization kinetics of a glass based on one type of mica, NaMg 3 AlSi 3 O 10 F 2 , with the addition of a nucleating agent, TiO 2 , has been studied using differential thermal analysis (DTA) under both isothermal and nonisothermal conditions. Two distinct crystallization exotherms in the DTA curve are observed and resolved that correspond to the initial formation of magnesium titanate (MgTi 2 O 5 ) and the later formation of mica. The activation energy for precipitation of each crystalline phase has been evaluated, and the crystallization mechanism has been studied. The results indicate that the growth of mica is a two-dimensional process, controlled by the crystal-glass interface reaction. The average calculated values of activation energies are 256 ± 11 kJ/mol and 275 ± 6 kJ/mol for the precipitation of MgTi 2 O 5 and mica from the glass matrix, respectively.

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“…The EB for thermal decomposition reactions that follow first-order kinetics can be determined in a simple manner from DDTA curves (236). A method was presented for the rapid determination of the growth morphologies of glass-forming materials using DTA or DSC (134). Chemical kinetics subroutines were developed for isothermal and nonisothermal DSC and for DTA by digitizing analog outputs (367).…”

Section: IXmentioning

confidence: 99%

Thermal analysis

Wendlandt¹

1984

Anal. Chem.

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Determination of the avrami exponent by non-isothermal analyses

Cited by 33 publications

References 12 publications

Crystallization Kinetics of the LiBO₂–Nb₂O₅ Glass Using Differential Thermal Analysis

Crystallization Kinetics of the LiBO₂–Nb₂O₅ Glass Using Differential Thermal Analysis

Differential Thermal Analysis on the Crystallization Kinetics of K₂O‐B₂O₃‐MgO‐Al₂O₃‐SiO₂‐TiO₂‐F Glass

Thermal analysis

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Determination of the avrami exponent by non-isothermal analyses

Cited by 33 publications

References 12 publications

Crystallization Kinetics of the LiBO2–Nb2O5 Glass Using Differential Thermal Analysis

Crystallization Kinetics of the LiBO2–Nb2O5 Glass Using Differential Thermal Analysis

Differential Thermal Analysis on the Crystallization Kinetics of K2O‐B2O3‐MgO‐Al2O3‐SiO2‐TiO2‐F Glass

Thermal analysis

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Crystallization Kinetics of the LiBO₂–Nb₂O₅ Glass Using Differential Thermal Analysis

Crystallization Kinetics of the LiBO₂–Nb₂O₅ Glass Using Differential Thermal Analysis

Differential Thermal Analysis on the Crystallization Kinetics of K₂O‐B₂O₃‐MgO‐Al₂O₃‐SiO₂‐TiO₂‐F Glass