THE THORITE+HUTTONITE PHASE TRANSFORMATION AS DETERMINED BY GROWTH OF SYNTHETIC THORITE AND HUTTONITE SINGLE CRYSTALS C. B. FrNcn, L. A. Hannrs AND G. W. Cranr, Metals and' Ceromics
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چکیده
The structure of margarosanite is probably very similar to that of synthetic CazBaSisOg. This in turn is closely related to other substances containing X3Oe rings: compare the cell dimensions given. These data show the existence of a series of metasilicates of large divalent cations containing X3Oe rings. These structures can also exhibit cation ordering; thus the Ca/Ba ratio is known to be fixed in CazBaSiaOg, and it does not form solid solutions with either a-CaSiOe or BaSiOe. Water is not an essential constituent of CazBaSiaOe as crystals are readily grown from melts at -1320" C. The authors hope that other less well characterized metasilicates of large cations will be studied to enable an extension of this classification.
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