Abstract
AbstractLaNbON2 was synthesized by thermal ammonolysis of crystalline LaNbO4 prepared by a soft chemistry approach. LaNbON2 crystallizes in a distorted GdFeO3‐like perovskite structure with space group Pnma and a = 5.5720(2), b = 7.8656(4), c = 5.6066(3) Å and a random anionic arrangement as revealed by neutron diffraction. Elongated displacement ellipsoids found by neutron diffraction and a considerable degree of residual bond strain as revealed by the bond valence calculations suggest a local positional disorder of the niobium ions.The material exhibits good chemical stability at ambient conditions and a considerable thermal stability upon heating in synthetic air (up to T = 500 K) as well as a small optical band gap of ~1.7 eV.
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