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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Synthesis, crystal structure and optical properties of LaNbON_2
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Synthesis, crystal structure and optical properties of LaNbON_2

机译:LaNbON_2的合成,晶体结构和光学性质

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摘要

LaNbON_2 was synthesized by thermal ammonolysis of crystalline LaNbO_4 prepared by a soft chemistry approach. LaNbON_2 crystallizes in a distorted GdFe_3-like perovskite structure with space group Prima and a = 5.5720(2), b = 7.8656(4), c = 5.6066(3) ? and a random anionic arrangement as revealed by neutron diffraction, Elongated displacement ellipsoids found by neutron diffraction and a con- siderable 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.
机译:LaNbON_2是通过软化学方法制备的结晶LaNbO_4的热氨解反应合成的。 LaNbON_2以扭曲的GdFe_3状钙钛矿结构结晶,空间结构为Prima,a = 5.5720(2),b = 7.8656(4),c = 5.6066(3)?由中子衍射揭示的无规阴离子排列,由中子衍射发现的伸长位移椭球以及由键合价计算显示的相当大程度的残余键应变表明铌离子的局部位置无序。该材料具有良好的化学性质在环境条件下具有稳定的稳定性,并且在合成空气中加热时(高达T = 500 K)具有相当大的热稳定性,并且光学带隙约为1.7 eV。

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