固体の表面構造と相転移の研究 Studies on the Surface Structure and Phase Transformation of Solids

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The author shows two examples of phase transformation in some oxide ceramics, which is caused by the reaction of oxide ceramics and a vapor phase. The first example is a tetragonal-to-monoclinic transformation in ZrO<SUB>2</SUB>-Y<SUB>2</SUB>O<SUB>3</SUB> ceramics which takes place isothermally during low temperature aging in air, accompanying an weight increase. An absorption band at 3340 cm<SUP>-1</SUP> appears in FT-IR DRIFT spectrum in association with the appearance of monoclinic phase in ZrO<SUB>2</SUB>-Y<SUB>2</SUB>O<SUB>3</SUB> ceramics. The reaction between ZrO<SUB>2</SUB>-Y<SUB>2</SUB>O<SUB>3</SUB> ceramics and H<SUB>2</SUB>O in air, and the diffusion of OH- ions in the powders must be essential for this phase transformation to take place. The second case is an oxidation and reduction of powdered ceramic superconductor YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>y</SUB> In the case of isothermal reduction using orthorhombic powders, the reduction is controlled by the removing rate of oxygen from the particle surface. On the other hand, in a case of isothermal oxidation of tetragonal powders, the orthorhombic phase exists as a skin surrounding the unreacted core of the tetragonal phase. The oxidation is recognized to be controlled by the moving rate of the interface between the tetragonal and orthorhombic phases.

収録刊行物

  • 粉体および粉末冶金

    粉体および粉末冶金 44(10), 905-911, 1997-10-15

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002261472
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    REV
  • ISSN
    05328799
  • NDL 記事登録ID
    4324254
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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