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Synthesis, Crystal Structure and Optical Properties of LaNbON 2
Author(s) -
Logvinovich Dmitry,
Ebbinghaus Stefan G.,
Reller Armin,
Marozau Ivan,
Ferri Davide,
Weidenkaff Anke
Publication year - 2010
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201000067
Subject(s) - valence (chemistry) , neutron diffraction , crystal structure , niobium , thermal stability , crystallography , materials science , diffraction , bond length , chemical bond , band gap , molecular geometry , chemistry , molecule , optics , optoelectronics , physics , organic chemistry , metallurgy
LaNbON 2 was synthesized by thermal ammonolysis of crystalline LaNbO 4 prepared by a soft chemistry approach. LaNbON 2 crystallizes in a distorted GdFeO 3 ‐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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