ic301870n_si_002.cif (2.58 kB)

Crystal Structure and Superconducting Properties of Hexagonal Lithium–Niobium Oxynitride

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posted on 20.02.2016, 09:06 by Teruki Motohashi, Masahiko Ito, Yuji Masubuchi, Makoto Wakeshima, Shinichi Kikkawa
A hexagonal oxynitride (Li0.880.12)­Nb3.0(O0.13N0.87)4 was synthesized through ammonia nitridation of LiNb3O8. The structural analysis revealed that this oxynitride consists of alternate stacking of octahedral and prismatic layers with different Li/Nb ratios: significant amounts of Li and Nb atoms (Li/Nb = 43/57) coexist in the octahedral layer, while the prismatic site is preferentially occupied by Nb (Li/Nb = 3/97). A metallic behavior was accompanied by an abrupt drop of electrical resistivity at about 3 K. Furthermore, large diamagnetism and specific-heat anomaly were observed below this temperature, suggesting the appearance of superconductivity in the Li–Nb oxynitride.