A study on glass transition and crystallization kinetics in Sb0.12As0.36Se0.52 glassy alloy by using non-isothermal techniques

Vázquez, J.; López-Alemany, P.L.; Villares, P.; Jiménez‐Garay, R.

doi:10.1016/s0254-0584(98)00220-x

Cited by 32 publications

(18 citation statements)

References 19 publications

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“…This DSC trace shows the typical behaviour of a glass-crystal transformation. The DSC data for the different heating rates, β, quoted in Section 3, show values of the quantities T g , T c and T p, which increase with increasing β a property which has been reported in the literature [25]. The ratio between the ordinates and the total area of the peak gives the corresponding crystallization rates, which make it possible to plot the curves of the exothermal peaks represented in Fig.…”

Section: Resultsmentioning

confidence: 59%

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A theoretical method for analyzing the glass-crystal transformation observed by DSC in the continuous heating regime. Application to the Sb0.16As0.36Se0.48 semiconducting alloy

Vázquez

González-Palma

López-Alemany

et al. 2004

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 59%

“…3. It may be observed that the (dx/dt) | p value increases in the same proportion as the heating rate, a property which has been widely discussed in the literature [25].…”

Section: Resultsmentioning

confidence: 84%

A theoretical method for analyzing the glass-crystal transformation observed by DSC in the continuous heating regime. Application to the Sb0.16As0.36Se0.48 semiconducting alloy

Vázquez

González-Palma

López-Alemany

et al. 2004

Journal of Alloys and Compounds

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“…[5], usando los valores de E, K 0 , y n obtenidos por los tratamientos isotermos. La Fig.5 muestra la curva teórica típica y las experimentales de procesos no isotermos, incluyendo el efecto del recocido durante un tiempo equivalente al de incubación.…”

Section: Resultados Y Discusiónunclassified

“…[4] con respecto al tiempo, resultando [ 5 ] La máxima velocidad de cristalización se encuentra haciendo d 2 x/dt 2 =0, obteniéndose la relación [ 6 ] en la que β = dT/dt es la velocidad de calentamiento para un proceso no isotermo, y donde se denotan con el subíndice p los valores de magnitudes correspondientes a la máxima velocidad de cristalización.…”

Section: Tratamiento No Isotermounclassified

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Generalización de la ecuación de transformación de fases al análisis de la cinética de cristalización no-isoterma. Aplicación a la aleación vítrea Cu0.10As0.40Se0.50

Vázquez¹,

López-Alemany²,

Villares³

et al. 2000

Bol. Soc. Esp. Ceram. Vidr.

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. Puerto Real (Cádiz).Las técnicas de análisis térmico diferencial se emplean con frecuencia para estudiar la cinética de las reacciones de transformación y, en particular la de la cristalización de aleaciones vítreas. Los datos térmicos correspondientes pueden analizarse por el método de Kissinger, que se desarrolló originalmente para el estudio de reacciones homogéneas. Durante varias décadas, el consenso en la literatura fue que tales aplicaciones (es decir, a transformaciones heterogéneas de estado sólido) del método de Kissinger no eran válidas. En el presente trabajo se señalan las principales objeciones a las aplicaciones mencionadas y se da una deducción alternativa de los resultados teóricos. Estos resultados demuestran que el método de Kissinger es válido para reacciones heterogéneas del tipo descrito por la ecuación de Johnson-Mehl-Avrami en el caso isotermo. También se dan los datos de cristalización isoterma y no isoterma de la aleación vítrea Cu 0.10 As 0.40 Se 0.50 . Los resultados experimentales y la discusión realizada aquí, ayudan a aclarar los efectos del tiempo de incubación en la cinética de transformaciones no isotermas y proporcionan una demostración adicional de la validez de la teoría generalizada de Johnson-Mehl-Avrami para la descripción de transformaciones heterogéneas de estado sólido. Palabras clave: Aleación vítrea, procesos isotermos y no isotermos, velocidad de calentamiento, parámetros cinéticos, recocido.Generalization of the phase transformation equation for the analysis of non-isothermal crystallization kinetics. Application to the Cu 0.10 As 0.40 Se 0.50 glassy alloy.The techniques of differential thermal analysis are frequently employed to study the kinetics of the transformation reactions and, in particular, the crystallization of the glassy alloys. The corresponding thermal data can be analyzed by the Kissinger method, which was originally derived for the study of homogeneous reactions. The consensus in the literature, in several decades, was that such applications (i.e. to heterogeneous solid state transformations) of the Kissinger method are not valid. In the present work the principal objections to the mentioned applications are addressed and alternative derivations of theoretical results are provided. These results demonstrate that the Kissinger method is valid for heterogeneous reactions of the type described by Johnson-Mehl-Avrami equation in the isothermal case. Also the isothermal and non-isothermal data on crystallization of the Cu 0.10 As 0.40 Se 0.50 glassy alloy are given. The experimental results and the discussion carried out here, help to clarify the effects of incubation time in non-isothermal transformation kinetics and provide a further demonstration of validity of the generalized Johnson-Mehl-Avrami theory for the description of heterogeneous solid state transformations.

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A Theoretical Study on Thermo-Analytical Techniques in Differential Scanning Calorimetry. Application to the Crystallization of the Semiconducting Sb0.12As0.40Se0.48Alloy

López-Alemany¹,

Vázquez²,

Villares³

et al. 2000

phys. stat. sol. (b)

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A procedure has been developed for analyzing the evolution with time of the volume fraction crystallized and for calculating the kinetic parameters at non‐isothermal reactions in materials involving formation and growth of nuclei. Considering the assumptions of extended volume and random nucleation, a general expression of the fraction crystallized as a function of time has been obtained in isothermal crystallization process. The application of the crystallization rate to the non‐isothermal processes has been carried out under the restriction of a nucleation which takes place early in the transformation and the nucleation frequency is zero thereafter. Under these conditions, the kinetic parameters have been deduced by using the techniques of data analysis of single‐scan and multiple‐scan. The theoretical method developed has been applied to the crystallization kinetics of the semiconducting Sb0.12As0.40Se0.48 alloy. The kinetic parameters obtained according to both techniques differ by only about 6%, which confirms the reliability and accuracy of the single‐scan technique when calculating the above‐mentioned parameters in non‐isothermal crystallization processes.

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A study on glass transition and crystallization kinetics in Sb0.12As0.36Se0.52 glassy alloy by using non-isothermal techniques

Cited by 32 publications

References 19 publications

A theoretical method for analyzing the glass-crystal transformation observed by DSC in the continuous heating regime. Application to the Sb0.16As0.36Se0.48 semiconducting alloy

A theoretical method for analyzing the glass-crystal transformation observed by DSC in the continuous heating regime. Application to the Sb0.16As0.36Se0.48 semiconducting alloy

Generalización de la ecuación de transformación de fases al análisis de la cinética de cristalización no-isoterma. Aplicación a la aleación vítrea Cu<sub>0.10</sub>As<sub>0.40</sub>Se<sub>0.50</sub>

A Theoretical Study on Thermo-Analytical Techniques in Differential Scanning Calorimetry. Application to the Crystallization of the Semiconducting Sb0.12As0.40Se0.48Alloy

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