single-crystal X-ray diffraction data and was confirmed with Rietveld refinement methods and lattice-energy calculations (Madelung part of lattice energy, MAPLE). Ca[LiAlN2] forms layers of edge- and vertex-sharing AlN4 tetrahedra isotypic with LiCaGaN2. Li+ ions are positioned in tetrahedral voids within the [Al2N2N4/2] layers resulting in a highly condensed structure of Al- and Li-centered polyhedra.
Ca[LiAlN2] 是由 LiAlH4、
LiN3、
钙和
锂金属在 900 °C 的焊接封闭
钽坩埚中作为助熔剂合成的。该化合物以透明的无色小片形式结晶,在空气中和
潮湿条件下会发生
水解。晶体结构 [P21/c (no. 14), a = 5.7587(12) A, b = 6.8773(14) A, c = 5.7960(12) A, β = 90.28(3)°, Z = 4]由单晶 X 射线衍射数据求解,并通过 Rietveld 精修方法和晶格能计算(Madelung 部分晶格能,
MAPLE)得到证实。Ca[LiAlN2] 形成与 LiCaGaN2 同型的共享边缘和顶点的 AlN4 四面体层。Li+ 离子位于 [Al2N2N4/2] 层内的四面体空隙中,形成以铝和
锂为中心的多面体的高度凝聚结构。