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

Crystals

Rachelle Ann F. Pinlac¹  Charlotte L. Stern¹ 

[1] Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA;

关键词: perovskites;    oxide-fluorides;    hydrothermal synthesis;   

DOI  :  10.3390/cryst1010003

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.