6533b7d1fe1ef96bd125c0f3
RESEARCH PRODUCT
Synthesis and crystal structure of novel Ruddlesden–Popper strontium niobium oxynitrides
Daniel Beltrán-porterJudith Oró-soléAmparo FuertesGerard Tobiassubject
StrontiumValence (chemistry)Inorganic chemistryNiobiumchemistry.chemical_elementGeneral ChemistryCrystal structureElectron localization functionParamagnetismCrystallographychemistryOxidation stateMaterials ChemistryStoichiometrydescription
Abstract The family (SrO)(SrNbO 2-x N) 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 2 NbO 3 N) and n =2 (Sr 3 Nb 2 O 5 N 2 ) by solid state reaction of Nb 2 O 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2002-09-01 | Crystal Engineering |