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Welcome to Crystals: A New Open-Access, Multidisciplinary Forum for Growth, Structures and Properties of Crystals
Crystals 2011, 1(1), 3-14; doi:10.3390/cryst1010003

New Layered Oxide-Fluoride Perovskites: KNaNbOF5 and KNaMO2F4 (M = Mo6+, W6+)

Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA
* Author to whom correspondence should be addressed.
Received: 24 February 2011 / Revised: 9 March 2011 / Accepted: 16 March 2011 / Published: 18 March 2011
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KNaNbOF5 and KNaMO2F4 (M = Mo6+, W6+), three new layered oxide-fluoride perovskites with the general formula ABB’X6, form from the combination of a second-order Jahn-Teller d0 transition metal and an alkali metal (Na+) on the B-site. Alternating layers of cation vacancies and K+ cations on the A-site complete the structure. The K+ cations are found in the A-site layer where the fluoride ions are located. The A-site is vacant in the adjacent A-site layer where the axial oxides are located. This unusual layered arrangement of unoccupied A-sites and under bonded oxygen has not been observed previously although many perovskite-related structures are known.
Keywords: perovskites; oxide-fluorides; hydrothermal synthesis perovskites; oxide-fluorides; hydrothermal synthesis
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Pinlac, R.A.F.; Stern, C.L.; Poeppelmeier, K.R. New Layered Oxide-Fluoride Perovskites: KNaNbOF5 and KNaMO2F4 (M = Mo6+, W6+). Crystals 2011, 1, 3-14.

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