Solid Solubilities in the Alkaline-Earth Metal Aluminates

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  • ITO Suketoshi
    Department of Inorganic Materials, Nagoya Institute of Technology
  • BANNO Shirou
    Department of Inorganic Materials, Nagoya Institute of Technology
  • SUZUKI Kazutaka
    Department of Inorganic Materials, Nagoya Institute of Technology
  • INAGAKI Michio
    School of Materials Science, Toyohashi University of Technology

Bibliographic Information

Other Title
  • アルカリ土類金属アルミネート間の固溶関係
  • アルカリ ドルイ キンゾク アルミネートカン ノ コヨウ カンケイ
Published
1979
DOI
  • 10.2109/jcersj1950.87.1007_344
Publisher
The Ceramic Society of Japan

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Description

The solid solubilities in the alkaline-earth metal aluminates with the stuffed tridymite structure (CaAl2O4, SrAl2O4 and BaAl2O4) were investigated on heating at 900°-1500°C in air. The results obtained are summarized as follows:<br>(1) The soild solubilities in these aluminates, CaAl2O4, SrAl2O4 and BaAl2O4, depend on the difference in the linkage of AlO4-tetrahedra in the stuffed tridymite structure. Two types of solid solution, BaAl2O4-type and CaAl2O4-type, formed in the binary and the ternary systems in CaAl2O4-SrAl2O4-BaAl2O4.<br>(2) The BaAl2O4-type and the CaAl2O4-type structures are closely related to the average ionic radius of alkaline-earth metals which were stuffed in the channels made up of AlO4-tetrahedra. In the range of 1.14 to 1.21Å, the CaAl2O4-type structure was formed, and from 1.23 to 1.50Å the BaAl2O4-type was formed.<br>(3) Below 1.37Å of the average ionic radius of alkaline-earth metals, the BaAl2O4-type structure slightly distored to the α-SrAl2O4-type structure at low temperatures.

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