Coarsening Process of Nucleation-Growth Type Phase-Separated Particles in Binary Germanate Glasses

Kunihiko Nakashima, Koichi Hayashi, Kenji Morinaga

研究成果: ジャーナルへの寄稿記事

2 引用 (Scopus)

抄録

The coarsening process of nucleation-growth type phase-separated particles in a metastable immiscible region of binary Ge02 systems was investigated in detail, and is discussed in terms of the mechanism of connection and coalescence for fluid mixtures. Furthermore, the factors which affect the coarsening process were investigated. At the later stage of the growth of particles, their mean radius r changed in proportion to the ath power of time (r(t)∝tα), and the value of growth rate α varied in the range of 0.34 ∽0.68 depending on the number of connected and coalesced particles n. It was found that nucleation-growth type phase-separated particles grow coarser intermittently by the mechanism of connection and coalescence, and that this coarsening process can not be explained by the usual theory of the l/3rd power rule. The factors which affect this coarsening process of particles are volume fraction Vf of particles and interfacial tension γA/B between the particles and the dispersed phase. Additionally, it is found that the mean number n of connected and coalesced particles concerning all the measured compositions can be arranged on one line by the cohesive coefficient Vf⋅γA/B defined in this study.

元の言語英語
ページ(範囲)766-771
ページ数6
ジャーナルMaterials Transactions, JIM
31
発行部数9
DOI
出版物ステータス出版済み - 1 1 1990

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Coarsening
Nucleation
nucleation
Glass
glass
Coalescence
coalescing
Surface tension
Volume fraction
Fluids
Chemical analysis
proportion
interfacial tension
radii
fluids
coefficients

All Science Journal Classification (ASJC) codes

  • Engineering(all)

これを引用

Coarsening Process of Nucleation-Growth Type Phase-Separated Particles in Binary Germanate Glasses. / Nakashima, Kunihiko; Hayashi, Koichi; Morinaga, Kenji.

:: Materials Transactions, JIM, 巻 31, 番号 9, 01.01.1990, p. 766-771.

研究成果: ジャーナルへの寄稿記事

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AB - The coarsening process of nucleation-growth type phase-separated particles in a metastable immiscible region of binary Ge02 systems was investigated in detail, and is discussed in terms of the mechanism of connection and coalescence for fluid mixtures. Furthermore, the factors which affect the coarsening process were investigated. At the later stage of the growth of particles, their mean radius r changed in proportion to the ath power of time (r(t)∝tα), and the value of growth rate α varied in the range of 0.34 ∽0.68 depending on the number of connected and coalesced particles n. It was found that nucleation-growth type phase-separated particles grow coarser intermittently by the mechanism of connection and coalescence, and that this coarsening process can not be explained by the usual theory of the l/3rd power rule. The factors which affect this coarsening process of particles are volume fraction Vf of particles and interfacial tension γA/B between the particles and the dispersed phase. Additionally, it is found that the mean number n of connected and coalesced particles concerning all the measured compositions can be arranged on one line by the cohesive coefficient Vf⋅γA/B defined in this study.

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