MIXED OXIDES OF TITANIUM AND NIOBIUM. I distances 1. 95 and 2.76 A between metal and anion, anion and anion respectively in Nb02F; Vousden (1951) 2.00 and 2.82 A for KNbOs, 1.95 and 2-76/~ for NaNb0s; BystrSm's (1944) data for the pyrochlor structure, based upon indirect methods, is not included.
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A. D. Wadsley (1961) studied this question.