Structural chemistry of Sr3Cr2WO9, Ca3Cr2WO9, and Ba3Cr2WO9 |
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Authors: | Dominique Ballutaud-Harari Paul Poix |
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Institution: | E.R. 83 du C.N.R.S.—Laboratoire de Chimie Minérale, Bâtiment 420 Faculté des Sciences, 91406 Orsay, France |
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Abstract: | We have studied the preparation and crystallographic structure of three perovskite-type compounds: Sr3Cr2WO9, cubic, the lattice parameter of which is a = 7.812Å; Ca3Cr2WO9, tetragonal, the lattice parameters of which are a = 5.408 Å and c = 7.635Å; and Ba3Cr2WO9, hexagonal, the lattice parameters of which are a = 5.691 Å and c = 13.957Å. We have compared these three structures and shown the relationship between the dimensions of the alkaline-earth metal and the existence of the different structures. |
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