X線回折法による非化学量論組成のMg_<(1-x)>Al_<(2+2/3・x)>O_4スピネルの結晶構造の評価

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Ｘ線ディフラクトメータ法による回折パターンの測定結果をもとに、Al2O3を過剰に含むMgAl2O4スピネルの結晶構造を調べた。Ｘ線回折強度の理論計算結果と比較することで、空孔は2種類の陽イオン位置両方にランダムに存在していることがわかった。化学量論組成のスピネルに比べて若干小さい酸素パラメータ(0.384)が得られた。In steel refining process,castable refractories containing magnesium aluminate spinel are extensively used as linings of furnace.Most of those spinels are non-stoichiometric and have many vacancies in the structure as compared with stoichiometric spinel.In order to get a preliminary knowledge about the relation between the resistance to slag-corrosion and spinel structure,the position of vacancy and the oxygen parameter in non-stoichiometric magnesium aluminate spinmel,which contains surplus alumina,are discussed by the use of X-ray diffraction technique.(1)The vacancies exist disorderly.(2)It is considered that some of Al3+ ions occupy Mg2+ site to balance the electrical charge and the cation vacancies exist in both two cation sites.(3)The oxygen parameter is smaller than that for the case of stoichiometric spinel.
高温学会の論文
1997-09-20