Li₂Ba₄Al₂Ta₂N₈O, the First Barium Nitridoalumotantalate with BCT‐Zeolite Type Structure

Abstract

Single-crystals of Li 2 Ba 4 Al 2 Ta 2 N 8 O:Eu 2 + were synthesized from Ba 3 N 2 , Al 2 O 3 , Li 3 N, Eu 2 O 3 , and lithium metal by a high-temperature solid-state reaction in a weld shut tantalum ampule. The crystal structure of Li 2 Ba 4 Al 2 Ta 2 N 8 O was determined by single-crystal X-ray diffraction and it crystallizes in the orthorhombic space group Pnnm (no. 58) with the lattice parameters a = 1006.71(3), b = 1026.58(3), c = 607.10(2) pm, and a volume of V = 0.62742(3) nm 3 . The compound is built up from AlN 4 and TaN 4 tetrahedra, which form a three-dimensional network corresponding to the BCT-zeolite type structure.

Synthesis and Crystal Structure of the Zinc Borate Zn3B4O9

“…The borate layers of the new zinc borate are structurally similar to the BCT framework type of zeolites (Figure 6). This framework type is formed by AlN 4 and TaN 4 tetrahedra in Li 2 M 4 Al 2 Ta 2 N 8 O (M=Ba, Sr) and SiN 4 tetrahedra in LiM 4 Si 4 N 8 F (M=Ca, Sr) [25–27] …”

“…This framework type is formed by AlN 4 and TaN 4 tetrahedra in Li 2 M 4 Al 2 Ta 2 N 8 O (M = Ba, Sr) and SiN 4 tetrahedra in LiM 4 Si 4 N 8 F (M = Ca, Sr). [25][26][27] The BCT structure consists of vierer-and achter-rings, [15] which both are also present in the borate. However, the borate additionally has dreier-and sechser-rings, that are a result of a higher linkage of the tetrahedra inside of the layer.…”