Development of Two‐Phase Structure in Glasses, with Special Reference to the System BaO‐SiO2

T. P.SEWARD III, Donald R Uhlmann, DAVID TURNBULL

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Vapor deposition was used to obtain homogeneous glass films of several BaO‐SiO2 compositions in the region of the metastable miscibility gap. The films were electron‐beam heated in the electron microscope, and the phase separation process was observed. At low BaO contents, separation was characterized by the appearance of discrete, amorphous, second‐phase particles. For compositions near the center of the miscibility gap, separation resulted in two continuously interconnected phases similar to those in the corresponding bulk glasses. In the thinnest of these films, the process proceeded by the coalescence of isolated particles into the interconnected second‐phase submicrostructure. At high BaO contents, rapid crystallization of the films prevented study of the separation process. Two processes which could lead to coalescence of discrete second‐phase particles into an interconnected submicrostructure are discussed. It is suggested that coalescence may occur when either of these processes results in the particles approaching within some small distance of each other. It is indicated that under appropriate conditions, this requirement may be satisfied by either process. These conclusions, together with the present observations of BaO‐SO2 thin films and those previously reported for bulk samples, indicate that observations of final phase‐separated morphologies are inadequate for specifying the processes by which those morphologies arose.

Original languageEnglish (US)
Pages (from-to)634-642
Number of pages9
JournalJournal of the American Ceramic Society
Volume51
Issue number11
DOIs
StatePublished - 1968
Externally publishedYes

Fingerprint

Coalescence
Glass
Particles (particulate matter)
Solubility
Vapor deposition
Crystallization
Chemical analysis
Phase separation
Electron microscopes
Thin films

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Development of Two‐Phase Structure in Glasses, with Special Reference to the System BaO‐SiO2. / III, T. P.SEWARD; Uhlmann, Donald R; TURNBULL, DAVID.

In: Journal of the American Ceramic Society, Vol. 51, No. 11, 1968, p. 634-642.

Research output: Contribution to journalArticle

@article{fbf101c5aed94f089d75237cc05df5f5,
title = "Development of Two‐Phase Structure in Glasses, with Special Reference to the System BaO‐SiO2",
abstract = "Vapor deposition was used to obtain homogeneous glass films of several BaO‐SiO2 compositions in the region of the metastable miscibility gap. The films were electron‐beam heated in the electron microscope, and the phase separation process was observed. At low BaO contents, separation was characterized by the appearance of discrete, amorphous, second‐phase particles. For compositions near the center of the miscibility gap, separation resulted in two continuously interconnected phases similar to those in the corresponding bulk glasses. In the thinnest of these films, the process proceeded by the coalescence of isolated particles into the interconnected second‐phase submicrostructure. At high BaO contents, rapid crystallization of the films prevented study of the separation process. Two processes which could lead to coalescence of discrete second‐phase particles into an interconnected submicrostructure are discussed. It is suggested that coalescence may occur when either of these processes results in the particles approaching within some small distance of each other. It is indicated that under appropriate conditions, this requirement may be satisfied by either process. These conclusions, together with the present observations of BaO‐SO2 thin films and those previously reported for bulk samples, indicate that observations of final phase‐separated morphologies are inadequate for specifying the processes by which those morphologies arose.",
author = "III, {T. P.SEWARD} and Uhlmann, {Donald R} and DAVID TURNBULL",
year = "1968",
doi = "10.1111/j.1151-2916.1968.tb12635.x",
language = "English (US)",
volume = "51",
pages = "634--642",
journal = "Journal of the American Ceramic Society",
issn = "0002-7820",
publisher = "Wiley-Blackwell",
number = "11",

}

TY - JOUR

T1 - Development of Two‐Phase Structure in Glasses, with Special Reference to the System BaO‐SiO2

AU - III, T. P.SEWARD

AU - Uhlmann, Donald R

AU - TURNBULL, DAVID

PY - 1968

Y1 - 1968

N2 - Vapor deposition was used to obtain homogeneous glass films of several BaO‐SiO2 compositions in the region of the metastable miscibility gap. The films were electron‐beam heated in the electron microscope, and the phase separation process was observed. At low BaO contents, separation was characterized by the appearance of discrete, amorphous, second‐phase particles. For compositions near the center of the miscibility gap, separation resulted in two continuously interconnected phases similar to those in the corresponding bulk glasses. In the thinnest of these films, the process proceeded by the coalescence of isolated particles into the interconnected second‐phase submicrostructure. At high BaO contents, rapid crystallization of the films prevented study of the separation process. Two processes which could lead to coalescence of discrete second‐phase particles into an interconnected submicrostructure are discussed. It is suggested that coalescence may occur when either of these processes results in the particles approaching within some small distance of each other. It is indicated that under appropriate conditions, this requirement may be satisfied by either process. These conclusions, together with the present observations of BaO‐SO2 thin films and those previously reported for bulk samples, indicate that observations of final phase‐separated morphologies are inadequate for specifying the processes by which those morphologies arose.

AB - Vapor deposition was used to obtain homogeneous glass films of several BaO‐SiO2 compositions in the region of the metastable miscibility gap. The films were electron‐beam heated in the electron microscope, and the phase separation process was observed. At low BaO contents, separation was characterized by the appearance of discrete, amorphous, second‐phase particles. For compositions near the center of the miscibility gap, separation resulted in two continuously interconnected phases similar to those in the corresponding bulk glasses. In the thinnest of these films, the process proceeded by the coalescence of isolated particles into the interconnected second‐phase submicrostructure. At high BaO contents, rapid crystallization of the films prevented study of the separation process. Two processes which could lead to coalescence of discrete second‐phase particles into an interconnected submicrostructure are discussed. It is suggested that coalescence may occur when either of these processes results in the particles approaching within some small distance of each other. It is indicated that under appropriate conditions, this requirement may be satisfied by either process. These conclusions, together with the present observations of BaO‐SO2 thin films and those previously reported for bulk samples, indicate that observations of final phase‐separated morphologies are inadequate for specifying the processes by which those morphologies arose.

UR - http://www.scopus.com/inward/record.url?scp=84977686395&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84977686395&partnerID=8YFLogxK

U2 - 10.1111/j.1151-2916.1968.tb12635.x

DO - 10.1111/j.1151-2916.1968.tb12635.x

M3 - Article

AN - SCOPUS:84977686395

VL - 51

SP - 634

EP - 642

JO - Journal of the American Ceramic Society

JF - Journal of the American Ceramic Society

SN - 0002-7820

IS - 11

ER -