The processes involved in the nitridation of Sr₂Nb₂O₇ and SrNbO₃ to SrNbO₂N were assessed by varying the nitridation time, and the related effects on the physical and photoelectrochemical properties of the nitrided products were investigated. In the case of the layered perovskite-type oxide Sr₂Nb₂O₇, the introduction of nitrogen and the extraction of oxygen took place concurrently, leading to lattice shrinkage and a porous structure. In contrast, during nitridation of the perovskite-type oxide SrNbO₃, nitrogen was initially introduced without any loss of oxygen, which caused phase separation as a result of a lattice expansion and a charge compensation. The photoelectrochemical properties of obtained SrNbO₂N under simulated sunlight were found to vary with the oxide precursor used and with the nitridation process.
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Kodera et al. (2018) studied this question.
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