Martin Klotz, Markus Seibald, Dominik Baumann, Klaus Wurst, Gunter Heymann, Hubert Huppertz
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引用次数: 0
摘要
摘要:以反应物M (M = Mo, W)和Li 3n为原料,在1000℃的射频炉中制备了化合物Li 6mon4和Li 6w4。单晶x射线衍射数据表明,锂氮金属在四角形体系中结晶,晶格参数为a = 6.6844(1), c = 4.9294(1) Å;粉末x射线衍射数据表明,锂氮金属在四角形体系中结晶,晶格参数为a = 6.6611(3), c = 4.9338(3) Å。分离出无色至微红色的钨化合物单晶,并在p42 / nmc (no. 6)空间群中细化了晶体结构。采用Rietveld细化法对钼化合物的粉末x射线数据进行了分析。这两种结构都属于Hoppe等人在1987年发表的Li 6 [ZnO 4]型(Untenecker H., Hoppe R. Z. Anorg.)。Allg。化学,1987,551,147-150),并且首次可以掺杂ce3 +。所研究的化合物在紫外至蓝光照射下呈现红色,并且具有较宽的发射带,Li 6 mon4的最大波长为λ max = 693 nm (fwhm为97 nm), Li 6 w4的最大波长为λ max = 653 nm (fwhm为133 nm)。
Crystal structures and luminescence properties of Li6MN4:Ce3+ (M = Mo, W)
Abstract The compounds Li 6 MoN 4 and Li 6 WN 4 were prepared from the reactants M ( M = Mo, W) and Li 3 N in a radiofrequency furnace at 1000 °C. The lithonitridometallates crystallize in the tetragonal system with the lattice parameters: a = 6.6844(1), c = 4.9294(1) Å for Li 6 WN 4 based on single-crystal X-ray diffraction data and a = 6.6611(3), c = 4.9338(3) Å for Li 6 MoN 4 taken from powder X-ray diffraction data. Colorless to slightly reddish single-crystals of the tungsten compound were isolated and the crystal structure was refined in the space group P 4 2 / nmc (no. 137) with Z = 2 and the powder X-ray data of the molybdenum compound were analyzed by a Rietveld refinement. Both structures belong to the Li 6 [ZnO 4 ] type published by Hoppe et al. in 1987 (Untenecker H., Hoppe R. Z. Anorg. Allg. Chem. 1987, 551 , 147–150) and could be doped with Ce 3+ for the first time. The investigated compounds show a reddish color impression upon UV to blue irradiation and exhibit a broad emission band with a maximum at λ max = 693 nm (fwhm 97 nm) for Li 6 MoN 4 and at λ max = 653 nm (fwhm 133 nm) for Li 6 WN 4 .