Abstract
The family (SrO)(SrNbO 2-xN) n is the first example of Ruddlesden-Popper strontium niobium oxynitrides and provides layered structures to obtain mixed valence niobium compounds with a variety of oxidation states and transport properties. We have prepared members with n=1 (Sr 2NbO 3N) and n=2 (Sr 3Nb 2O 5N 2) by solid state reaction of Nb 2O 5 and SrCO 3 at 900–1050 °C under ammonia flow. These compounds crystallize in the I4/mmm space group and show a range of anionic stoichiometry that together with the N/O ratio determines the formal oxidation state for niobium and therefore the resultant physical properties. Samples of the n=1 member show mixed valence Nb 5+/Nb 4+ and are paramagnetic and very resistive at room temperature. This behavior may be understood by considering electron localization due to N/O disorder.
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