Intergrowth of hexagonal tungsten bronze and perovskite-like structures: The oxides ACu3M7O21 (A = K, Rb, Cs, TI; M = Nb, Ta)
作者:A. Benmoussa、D. Groult、F. Studer、B. Raveau
DOI:10.1016/0022-4596(82)90205-5
日期:1982.2
Seven oxides ACu3M7O21 have been isolated with A = K, Rb, Tl, Cs for M = Ta and A = K, Rb, Cs for M = Nb. These phases are orthorhombic: a ⋍ 28 Å, b ⋍ 7.50 Å, and c ⋍ 7.55 Å, probable space group Cmmm. Their structure has been established from an X-ray diffraction study and from high-resolution microscopy observations. The structure consists of an intergrowth of single hexagonal tungsten bronze AM3O9
已分离出七个氧化物A Cu 3 M 7 O 21,其中M = Ta为A = K,Rb,Tl ,Cs,M = Nb为A = K,Rb,Cs 。这些相是正交的:a⋍28Å,b⋍7.50Å和c⋍7.55Å,可能的空间群Cmmm。通过X射线衍射研究和高分辨率显微镜观察已确定了它们的结构。该结构由单个六角形钨青铜AM 3 O 9薄片和双畸变钙钛矿Cu 3 M 4 O 12平板(M = Nb,Ta),其中铜具有平方配位。这些化合物的主晶格可以认为是“ n = 1;对应于公式|的一系列共生的n '= 2” M 3 O 9 | H n | M 2 O 6 | P n '。