Crystallization mechanisms of some Se<inf>100-x</inf>Te<inf>x</inf> glassy alloys

Y. Calventus; S. Suriñach; M. D. Baró

doi:10.1557/JMR.1997.0149

Crystallization mechanisms of some Se<inf>100-x</inf>Te<inf>x</inf> glassy alloys

Y. Calventus, S. Suriñach, M. D. Baró

Departament de Física

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Resum

La combinació de tècniques calorimètriques i microscòpiques mostra que tot el procés de cristal·lització d'algunes aliatges vítreos Se100-xTex (x = 1ль, 15) es produeix mitjançant dos mecanismes diferents, que anomenem superficial i massiu. Aquests mecanismes s'activen de manera diferent segons la velocitat d'escalfament particular utilitzada i la temperatura del tractament tèrmic isotèrmic escollit. Les freqüències de nucleació i les taxes de creixement es van determinar a partir de l'anàlisi microscòpica òptica polaritzat per reflexió, i hi ha una bona concordança entre aquests resultats experimentals i les prediccions fetes mitjançant teories clàssiques de nucleació i creixement normals. L'energia d'activació aparent del procés de cristal·lització total que s'obté a través de la calorimetria diferencial d'escombratge és superior per Se85Te15 que per Se90Te10, i es va establir una relació entre aquests valors i els obtinguts mitjançant energies d'activació de nucleació i creixement. Es presenta un debat detallat sobre el significat dels diferents índexs d'Avrami trobats.

Idioma original	Anglès
Pàgines (de-a)	1069-1075
Revista	Journal of Materials Research
Volum	12
Número	4
DOIs	https://doi.org/10.1557/JMR.1997.0149
Estat de la publicació	Publicada - 1 de gen. 1997

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10.1557/JMR.1997.0149

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@article{69ba45b821b64839aed2484307eb9606,

title = "Crystallization mechanisms of some Se100-xTex glassy alloys",

abstract = "The coupling of calorimetric and microscopic techniques shows that the whole crystallization process for some Se100-xTex (x = 10, 15) glassy alloys proceeds by two different mechanisms, which we call surface and bulk. These mechanisms are activated differently depending on the particular heating rate used and on the temperature of the isothermal heat treatment chosen. The nucleation frequencies and growth rates were determined from reflection polarized optical microscopy analysis, and a good agreement is found between these experimental results and predictions done by the classical nucleation and the normal growth theories. The apparent activation energy from the whole crystallization process which is obtained via differential scanning calorimetry is higher for Se85Te15 than for Se90Te10, and the relation with these values and those obtained from activation energies of nucleation and growth is established. A detailed discussion about the meaning of the different Avrami indexes found is presented.",

author = "Y. Calventus and S. Suri{\~n}ach and Bar{\'o}, \{M. D.\}",

year = "1997",

month = jan,

day = "1",

doi = "10.1557/JMR.1997.0149",

language = "English",

volume = "12",

pages = "1069--1075",

journal = "Journal of Materials Research",

issn = "0884-2914",

publisher = "Cambridge University Press",

number = "4",

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TY - JOUR

T1 - Crystallization mechanisms of some Se100-xTex glassy alloys

AU - Calventus, Y.

AU - Suriñach, S.

AU - Baró, M. D.

PY - 1997/1/1

Y1 - 1997/1/1

N2 - The coupling of calorimetric and microscopic techniques shows that the whole crystallization process for some Se100-xTex (x = 10, 15) glassy alloys proceeds by two different mechanisms, which we call surface and bulk. These mechanisms are activated differently depending on the particular heating rate used and on the temperature of the isothermal heat treatment chosen. The nucleation frequencies and growth rates were determined from reflection polarized optical microscopy analysis, and a good agreement is found between these experimental results and predictions done by the classical nucleation and the normal growth theories. The apparent activation energy from the whole crystallization process which is obtained via differential scanning calorimetry is higher for Se85Te15 than for Se90Te10, and the relation with these values and those obtained from activation energies of nucleation and growth is established. A detailed discussion about the meaning of the different Avrami indexes found is presented.

AB - The coupling of calorimetric and microscopic techniques shows that the whole crystallization process for some Se100-xTex (x = 10, 15) glassy alloys proceeds by two different mechanisms, which we call surface and bulk. These mechanisms are activated differently depending on the particular heating rate used and on the temperature of the isothermal heat treatment chosen. The nucleation frequencies and growth rates were determined from reflection polarized optical microscopy analysis, and a good agreement is found between these experimental results and predictions done by the classical nucleation and the normal growth theories. The apparent activation energy from the whole crystallization process which is obtained via differential scanning calorimetry is higher for Se85Te15 than for Se90Te10, and the relation with these values and those obtained from activation energies of nucleation and growth is established. A detailed discussion about the meaning of the different Avrami indexes found is presented.

UR - https://www.scopus.com/pages/publications/0031118224

U2 - 10.1557/JMR.1997.0149

DO - 10.1557/JMR.1997.0149

M3 - Article

SN - 0884-2914

VL - 12

SP - 1069

EP - 1075

JO - Journal of Materials Research

JF - Journal of Materials Research

IS - 4

ER -

Crystallization mechanisms of some Se<inf>100-x</inf>Te<inf>x</inf> glassy alloys

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