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Synthesis, crystal structure and properties of a new calcium-magnesium-monosilicate-chloride, Ca8Mg[(SiO4)4Cl2]

✍ Scribed by F. v. Lampe; K.H. Jost; B. Wallis; P. Leibnitz


Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
478 KB
Volume
16
Category
Article
ISSN
0008-8846

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✦ Synopsis


A new chloride-silicate, "belinite", CasMg(Si04)4CI2, has been synthesized from a CaCI o flux. It crystalllzes in perfect octahedra (monoerysta~s). The structure determination revealed cubic symmetry, a = 15.084 ~, space group Fd~. Si-and Mg-atoms are tetrahedrally surrounded by oxygen, Ca occurs in a 6-fold(6xO) and a 8-fold (6xO + 2xCl) coordination. In contrast to the chloride-silicate alinite belinite reveals no isomorphic substitution. There is no connection of Ca-coordination-polyhedra via common faces in the structure. This corresponds to the poor hydraulicity obtained.


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