Barrier to crystal nucleation in anorthite

D. Cranmer; R. Salomaa; H. Yinnon; D. R. Uhlmann

doi:10.1016/0022-3093(81)90097-1

Barrier to crystal nucleation in anorthite

D. Cranmer, R. Salomaa, H. Yinnon, D. R. Uhlmann

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Abstract

The kinetics of crystal nucleation in anorthite (CaAl₂Si₂O₈) have been determined over the range of undercooling between 475 and 600°C. The plot of In(I_vη) versus (ΔT_|staggered|r²T_|staggered|r³)^-1 is a straight line of negative slope over the temperature range investigated. The slope of this relation indicates a free energy barrier to crystal nucleation of about 82 kT* (where T* = 0.8T_E). The intercept at (ΔT_|staggered|r²T_staggered|r³)^-1 = 0 is approximately 10²⁷ cm^-3 s^-1P. Samples of anorthite glass were also analyzed by differential thermal analysis, with the temperature of maximum crystallization rate being determined as a function of heating rate. From this variation, a nucleation barrier of about 80 kT* was estimated. The combined results are in good agreement with predictions of the classical theory of homogeneous nucleation.

Original language	English (US)
Pages (from-to)	127-136
Number of pages	10
Journal	Journal of Non-Crystalline Solids
Volume	45
Issue number	1
DOIs	https://doi.org/10.1016/0022-3093(81)90097-1
State	Published - Jul 1981
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Materials Chemistry

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10.1016/0022-3093(81)90097-1

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@article{741eb56c6ef14f16a05d8f11bbeb564a,

title = "Barrier to crystal nucleation in anorthite",

abstract = "The kinetics of crystal nucleation in anorthite (CaAl2Si2O8) have been determined over the range of undercooling between 475 and 600°C. The plot of In(Ivη) versus (ΔT|staggered|r2T|staggered|r3)-1 is a straight line of negative slope over the temperature range investigated. The slope of this relation indicates a free energy barrier to crystal nucleation of about 82 kT* (where T* = 0.8TE). The intercept at (ΔT|staggered|r2Tstaggered|r3)-1 = 0 is approximately 1027 cm-3 s-1P. Samples of anorthite glass were also analyzed by differential thermal analysis, with the temperature of maximum crystallization rate being determined as a function of heating rate. From this variation, a nucleation barrier of about 80 kT* was estimated. The combined results are in good agreement with predictions of the classical theory of homogeneous nucleation.",

author = "D. Cranmer and R. Salomaa and H. Yinnon and Uhlmann, {D. R.}",

note = "Funding Information: Financial support for the present work was provided by the National Science Foundation. This support is gratefully acknowledged, as is the assistance of the Undergraduate Research Opportunities Program at MIT.",

year = "1981",

month = jul,

doi = "10.1016/0022-3093(81)90097-1",

language = "English (US)",

volume = "45",

pages = "127--136",

journal = "Journal of Non-Crystalline Solids",

issn = "0022-3093",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Barrier to crystal nucleation in anorthite

AU - Cranmer, D.

AU - Salomaa, R.

AU - Yinnon, H.

AU - Uhlmann, D. R.

N1 - Funding Information: Financial support for the present work was provided by the National Science Foundation. This support is gratefully acknowledged, as is the assistance of the Undergraduate Research Opportunities Program at MIT.

PY - 1981/7

Y1 - 1981/7

N2 - The kinetics of crystal nucleation in anorthite (CaAl2Si2O8) have been determined over the range of undercooling between 475 and 600°C. The plot of In(Ivη) versus (ΔT|staggered|r2T|staggered|r3)-1 is a straight line of negative slope over the temperature range investigated. The slope of this relation indicates a free energy barrier to crystal nucleation of about 82 kT* (where T* = 0.8TE). The intercept at (ΔT|staggered|r2Tstaggered|r3)-1 = 0 is approximately 1027 cm-3 s-1P. Samples of anorthite glass were also analyzed by differential thermal analysis, with the temperature of maximum crystallization rate being determined as a function of heating rate. From this variation, a nucleation barrier of about 80 kT* was estimated. The combined results are in good agreement with predictions of the classical theory of homogeneous nucleation.

AB - The kinetics of crystal nucleation in anorthite (CaAl2Si2O8) have been determined over the range of undercooling between 475 and 600°C. The plot of In(Ivη) versus (ΔT|staggered|r2T|staggered|r3)-1 is a straight line of negative slope over the temperature range investigated. The slope of this relation indicates a free energy barrier to crystal nucleation of about 82 kT* (where T* = 0.8TE). The intercept at (ΔT|staggered|r2Tstaggered|r3)-1 = 0 is approximately 1027 cm-3 s-1P. Samples of anorthite glass were also analyzed by differential thermal analysis, with the temperature of maximum crystallization rate being determined as a function of heating rate. From this variation, a nucleation barrier of about 80 kT* was estimated. The combined results are in good agreement with predictions of the classical theory of homogeneous nucleation.

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SN - 0022-3093

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EP - 136

JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

IS - 1

ER -

Barrier to crystal nucleation in anorthite

Abstract

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