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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
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Received: 24 February 2011 / Revised: 9 March 2011 / Accepted: 16 March 2011 / Published: 18 March 2011
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Abstract

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
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MDPI and ACS Style

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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