ZrF<sub>4</sub>-BaF<sub>2</sub>系フッ化物ガラスの結晶化

DOI Web Site Web Site オープンアクセス

書誌事項

タイトル別名
  • Crystallization in Fluoride Glasses Based on ZrF<sub>4</sub>-BaF<sub>2</sub> System
  • ZrF4 BaF2ケイ フッカブツ ガラス ノ ケッショウカ

この論文をさがす

説明

The non-isothermal crystallization kinetics in ZrF4-BaF2 and ZrF4-BaF2-NaF-AlF3 glasses were analyzed based on the method for determining the activation energy for crystal growth from DSC curves obtained at various heating rate. In binary system ZrF4-BaF2, most stable glasses were formed around the composition of 2 ZrF4⋅BaF2 (molar ratio) and the glass transition and crystallization temperatures increased as the glass composition approached to ZrF4⋅BaF2. It was found that the crystal particles grow two-dimensionally in thin film glass specimens. The activation energies for crystal growth were determined to be about 170 and 130kcal/mol in the composition range in which β-BaZrF6 and β-BaZr2F10 crystals precipitated respectively. In ZrF4-BaF2-NaF-AlF3 system, it was found that the crystal particles formed in the bulk specimens grow three-dimensionally and that the surface crystallization is predominant in powder specimens. The activation energies for crystal growth were below 120kcal/mol, much less than that for viscous flow. The crystallization mechanisms were discussed in detail.

収録刊行物

  • 窯業協會誌

    窯業協會誌 94 (1093), 941-947, 1986

    公益社団法人 日本セラミックス協会

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ