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Reference x-ray powder patterns and the crystal structures of the lanthanide compounds, BaR 2 ZnO 5 , in which R = La, Nd, Sm, Eu, Gd, Dy, Ho, Y, Er, or Tm, were determined by the x-ray Rietveld refinement technique. A structural trend was confirmed for this series of compounds. The compounds with smaller ionic radii (R = Sm, Eu, Gd, Dy, Ho, Y, Er, or Tm) are isostructural to the orthorhombic “green phase” (BaY 2 CuO 5 ). The lattice parameters for compounds with R = Tm to Sm range from  a  = 7.01855(9) Å to 7.20452(14) Å,  b  = 12.25445 (17) Å to 12.5882(2) Å, and  c  = 5.6786(14) Å to 5.81218(11) Å, respectively. R is sevenfold coordinated inside a monocapped trigonal prism. These prisms share edges to form wave-like chains parallel to the long  b -axis. The BaR 2 ZnO 5  compounds which contain larger size R (La and Nd) crystallize in the tetragonal space group  I4/mcm . The lattice parameters are  a  = 6.90982(10) and  c  = 11.5977(2) Å for BaLa 2 ZnO 5 , and  a  = 6.75979(5) Å and  c  = 11.54560(12) Å for BaNd 2 ZnO 5 . The structure consists of ZnO 4  tetrahedra (instead of planar CuO 4  groups as found in BaR 2 CuO 5 ) with 10-fold coordinated bicapped square prismatic Ba and 8-fold coordinated bicapped trigonal prismatic R ions between them. The reference x-ray powder patterns will be submitted to the Powder Diffraction File (PDF).

Crystal structures and reference powder patterns of BaR2ZnO5 (R = La, Nd, Sm, Eu, Gd, Dy, Ho, Y, Er, and Tm)