Synthesis,Crystal Structure and Optical Properties of LaNbON2 |
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| Authors: | Dmitry Logvinovich,Stefan G. Ebbinghaus,Armin Reller,Ivan Marozau,Davide Ferri,Anke Weidenkaff Prof. Dr. |
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| Affiliation: | 1. Solid State Chemistry and Catalysis, Empa, Ueberlandstrasse 129, 8600 Duebendorf, Switzerland;2. Solid State Chemistry, Martin‐Luther‐Universit?t Halle‐Wittenberg, 06120 Halle, Germany;3. Solid State Chemistry, University of Augsburg, 86159 Augsburg, Germany;4. Materials Group, Paul Scherrer Institut, 5232 Villigen, Switzerland;5. Department of Chemistry, University of Bern,3012 Bern, Switzerland |
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| Abstract: | LaNbON2 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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| Keywords: | Oxynitrides Perovskite phases Ammonolysis Functional materials Lanthanum niobates |
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