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An Electron Diffraction and XRPD Study of Superlattice Ordering in the Elpasolite-Related Oxyfluoride K3MoO3F3

✍ Scribed by F.J. Brink; R.L. Withers; K. Friese; G. Madariaga; L. Norén

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
589 KB
Volume
163
Category
Article
ISSN
0022-4596

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✦ Synopsis

A detailed electron di4raction and XRPD study has been made of the room-temperature polymorph of K 3 MoO 3 F 3 . It is shown that the true symmetry of this polymorph is neither tetragonal, trigonal, nor triclinic as previously reported but rather monoclinic I1a1, a ‫؍‬ 2a p ؊ c p , b ‫؍‬ 4b p , c ‫؍‬ a p ؉ 2c p when expressed in terms of the underlying elpasolite (ordered perovskite) parent structure type. A highly structured, three-dimensional, continuous di4use intensity distribution (presumably arising from local O/F ordering and associated structural relaxation) is shown to coexist with the sharp satellite re6ections characteristic of the monoclinic supercell.

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