ウスタイトとシリカとの反応におけるウスタイトの格子欠陥の挙動について

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タイトル別名
  • On the Behavior of the Cationic Vacancy in Wüstite During the Reaction between Wüstite and Silica (Experimental Studies on the Reaction between Wüstite and Silica (1))
  • ウスタイト ト シリカ ト ノ ハンノウ ニ オケル ウスタイト ノ コウシ ケッカン ノ キョドウ ニ ツイテ
  • On the Behavior of the Cationic Vacancy in Wüstite During the Reaction between Wüstite and Silica (Experimental Studies on the Reaction between Wüstite and Silica (1))

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A cylindrical wüstite pellet was thermally synthesized. The lattice constant of wüstite (4.307Å) in the pellet indicated that the amount of cationic vacancy was very small. It was also found that the magnetite in the pellet had a larger constant (8.52Å) than the stoichiometric one (8.390Å). The pellet was placed on a vitreous silica rod and heated at 1150°C for 24 hrs under A gas. As a result of the heating, a new crystalline phase was formed in the silica rod. The reacted wüstite pellet was separated from the silica at the surface of contact and was filed nearly parallel to the surface. The filings thus obtained from each layer of wüstite pellet were analyzed by using X-ray diffractometer. The nearer to the contact surface, the smaller the lattice constants for both the iron oxides. The largest constant for those oxides was comparable to the values observed befor the reaction. From the present experimental results the author obtained the following conclusions：(1) Wüstite which had reacted with silica might be expressed as Fe1−yO indicating lesser (or no) cationic vacancy as compared with the iron saturated wustite Fe1−xO (y<x). (2) Consequently, as the reaction proceeded the cationic vacancy was accumulated in the wüstite in the neighborhood of the contact surface; therefore, the lattice constant of this wüstite became smaller. (3) When the wüstite was saturated with the vacancy, magnetite was precipitated. This magnetite had a lattice constant comparable with the stoichiometric one.

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