Crystallization kinetics of Na2O · 3SiO2

D. R. Uhlmann; G. W. Scherer

doi:10.1016/0022-0248(75)90042-1

Crystallization kinetics of Na₂O · 3SiO₂

D. R. Uhlmann
, G. W. Scherer

Civil & Environmental Engineering

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

The crystallization kinetics of Na₂O · 3SiO₂ have been determined over the temperature range between 600°C and 800°C. The (metastable) melting point of this material has been determined as 811 ± 3°C. The growth rate vs. temperature relation exhibits the maximum generally found for glass-forming systems, with the maximum growth rate (3.3 x 10^-6 cm sec^-1) observed at 735 °C. Under all conditions of growth, the crystal-liquid interfaces are faceted. This is indicative of significant growth rate anisotropy, and suggests that the entropy of fusion is large in Jackson's sense (ΔS_fM &62- 4R, where ΔS_fM is the molar entropy of fusion). Assuming ΔS_fM = 4R, by analogy with the characteristics of Na₂O · 2SiO₂, the reduced growth rate versus undercooling relation has been constructed. The form of this relation - a straight line of positive slope passing through the origin - is suggestive of growth by a screw dislocation mechanism. The magnitudes of the growth rates are in close accord with the predictions of the standard model for such growth.

Original language	English (US)
Pages (from-to)	12-18
Number of pages	7
Journal	Journal of Crystal Growth
Volume	29
Issue number	1
DOIs	https://doi.org/10.1016/0022-0248(75)90042-1
State	Published - May 1975

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Inorganic Chemistry
Materials Chemistry

Access to Document

10.1016/0022-0248(75)90042-1

Cite this

@article{a6b74492edbe4b7e84447d2e31e8dbad,

title = "Crystallization kinetics of Na2O · 3SiO2",

abstract = "The crystallization kinetics of Na2O · 3SiO2 have been determined over the temperature range between 600°C and 800°C. The (metastable) melting point of this material has been determined as 811 ± 3°C. The growth rate vs. temperature relation exhibits the maximum generally found for glass-forming systems, with the maximum growth rate (3.3 x 10-6 cm sec-1) observed at 735 °C. Under all conditions of growth, the crystal-liquid interfaces are faceted. This is indicative of significant growth rate anisotropy, and suggests that the entropy of fusion is large in Jackson's sense (ΔSfM \&62- 4R, where ΔSfM is the molar entropy of fusion). Assuming ΔSfM = 4R, by analogy with the characteristics of Na2O · 2SiO2, the reduced growth rate versus undercooling relation has been constructed. The form of this relation - a straight line of positive slope passing through the origin - is suggestive of growth by a screw dislocation mechanism. The magnitudes of the growth rates are in close accord with the predictions of the standard model for such growth.",

author = "Uhlmann, \{D. R.\} and Scherer, \{G. W.\}",

note = "Funding Information: Financial support for the present work was provided by the National Aeronautics and Space Administration, and by Owens—Illinois Inc. (who provided G. S. with the Owens—Illinois Fellowship in Materials Science). This support is gratefully acknowledged, as are stimulating discussions with Dr. K. A. Jackson of Bell Telephone Laboratories.",

year = "1975",

month = may,

doi = "10.1016/0022-0248(75)90042-1",

language = "English (US)",

volume = "29",

pages = "12--18",

journal = "Journal of Crystal Growth",

issn = "0022-0248",

publisher = "Elsevier B.V.",

number = "1",

}

TY - JOUR

T1 - Crystallization kinetics of Na2O · 3SiO2

AU - Uhlmann, D. R.

AU - Scherer, G. W.

N1 - Funding Information: Financial support for the present work was provided by the National Aeronautics and Space Administration, and by Owens—Illinois Inc. (who provided G. S. with the Owens—Illinois Fellowship in Materials Science). This support is gratefully acknowledged, as are stimulating discussions with Dr. K. A. Jackson of Bell Telephone Laboratories.

PY - 1975/5

Y1 - 1975/5

N2 - The crystallization kinetics of Na2O · 3SiO2 have been determined over the temperature range between 600°C and 800°C. The (metastable) melting point of this material has been determined as 811 ± 3°C. The growth rate vs. temperature relation exhibits the maximum generally found for glass-forming systems, with the maximum growth rate (3.3 x 10-6 cm sec-1) observed at 735 °C. Under all conditions of growth, the crystal-liquid interfaces are faceted. This is indicative of significant growth rate anisotropy, and suggests that the entropy of fusion is large in Jackson's sense (ΔSfM &62- 4R, where ΔSfM is the molar entropy of fusion). Assuming ΔSfM = 4R, by analogy with the characteristics of Na2O · 2SiO2, the reduced growth rate versus undercooling relation has been constructed. The form of this relation - a straight line of positive slope passing through the origin - is suggestive of growth by a screw dislocation mechanism. The magnitudes of the growth rates are in close accord with the predictions of the standard model for such growth.

AB - The crystallization kinetics of Na2O · 3SiO2 have been determined over the temperature range between 600°C and 800°C. The (metastable) melting point of this material has been determined as 811 ± 3°C. The growth rate vs. temperature relation exhibits the maximum generally found for glass-forming systems, with the maximum growth rate (3.3 x 10-6 cm sec-1) observed at 735 °C. Under all conditions of growth, the crystal-liquid interfaces are faceted. This is indicative of significant growth rate anisotropy, and suggests that the entropy of fusion is large in Jackson's sense (ΔSfM &62- 4R, where ΔSfM is the molar entropy of fusion). Assuming ΔSfM = 4R, by analogy with the characteristics of Na2O · 2SiO2, the reduced growth rate versus undercooling relation has been constructed. The form of this relation - a straight line of positive slope passing through the origin - is suggestive of growth by a screw dislocation mechanism. The magnitudes of the growth rates are in close accord with the predictions of the standard model for such growth.

UR - https://www.scopus.com/pages/publications/49549143018

UR - https://www.scopus.com/pages/publications/49549143018#tab=citedBy

U2 - 10.1016/0022-0248(75)90042-1

DO - 10.1016/0022-0248(75)90042-1

M3 - Article

AN - SCOPUS:49549143018

SN - 0022-0248

VL - 29

SP - 12

EP - 18

JO - Journal of Crystal Growth

JF - Journal of Crystal Growth

IS - 1

ER -

Crystallization kinetics of Na₂O · 3SiO₂

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this