Crystal Structures and Reference Powder Patterns of BaR 2 ZnO 5 (R=La,Nd,Sm,Eu,Gd,Dy,Ho,Y,Er, and Tm).
作者： J. A. Kaduk , W. Wong-Ng , G. Greenwood , J. Dillingham , B. H. Toby
DOI: 10.6028/JRES.104.011
关键词:
摘要: Reference x-ray powder patterns and the crystal structures of lanthanide compounds, BaR{sub 2}ZnO{sub 5}, in which R = La, Nd, Sm, Eu, Gd, Dy, Ho, Y, Er, or Tm were determined by Rietveld refinement technique. A structural trend was confirmed for this series compounds. The compounds with smaller ionic radii (R Tm) are isostructural to orthorhombic green phase (BaY{sub 2}CuO{sub 5}). lattice parameters Sm range from a 7.01855(9) {angstrom} 7.20452(14) {angstrom}, b 12.25445(17) 12.5882(2) c 5.6786(14) 5.81218(11) respectively. is sevenfold coordinated inside monocapped trigonal prism. These prisms share edges form wave-like chains parallel long b-axis. 5} contain larger size (La Nd) crystallize tetragonal space group 14/mcm. 6.90982(10) 11.5977(2) BaLa{sub 6.75979(5) 11.54560(12) BaNd{sub 5}. structure consists ZnO{sub 4} tetrahedra (instead planar CuO{sub groups as found BaR{submore » 5}) 10-fold bicapped square prismatic Ba 8-fold ions between them. reference will be submitted Powder Diffraction File (PDF).« less
sci-hub.se 参考文章(13)
Marta Z. Cieplak, Gang Xiao, C. L. Chien, A. Bakhshai, D. Artymowicz, W. Bryden, J. K. Stalick, J. J. Rhyne, Incorporation of gold into YBa2Cu3O7: Structure and Tc enhancement. Physical Review B. ,vol. 42, pp. 6200- 6208 ,(1990) , 10.1103/PHYSREVB.42.6200
Judith K. Stalick, Winnie Wong-Ng, Neutron diffraction study of the “brown phase” BaNd2CuO5 Materials Letters. ,vol. 9, pp. 401- 404 ,(1990) , 10.1016/0167-577X(90)90074-V
C. Michel, B. Raveau, Ln2BaZnO5 and Ln2BaZn1−xCuxO5: A series of zinc oxides with zinc in a pyramidal coordination Journal of Solid State Chemistry. ,vol. 49, pp. 150- 156 ,(1983) , 10.1016/0022-4596(83)90108-1
Claude Michel, Bernard Raveau, Copper doped zinc oxide Y2BaZnO5: ERS and optical investigation Materials Research Bulletin. ,vol. 19, pp. 849- 855 ,(1984) , 10.1016/0025-5408(84)90046-1
R. D. Shannon, C. T. Prewitt, Effective ionic radii in oxides and fluorides Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. ,vol. 25, pp. 925- 946 ,(1969) , 10.1107/S0567740869003220
H. M. Rietveld, A profile refinement method for nuclear and magnetic structures Journal of Applied Crystallography. ,vol. 2, pp. 65- 71 ,(1969) , 10.1107/S0021889869006558
R. M. Hazen, L. W. Finger, R. J. Angel, C. T. Prewitt, N. L. Ross, H. K. Mao, C. G. Hadidiacos, P. H. Hor, R. L. Meng, C. W. Chu, Crystallographic description of phases in the Y-Ba-Cu-O superconductor Physical Review B. ,vol. 35, pp. 7238- 7241 ,(1987) , 10.1103/PHYSREVB.35.7238
Gang Xiao, F. H. Streitz, A. Gavrin, Y. W. Du, C. L. Chien, Effect of transition-metal elements on the superconductivity of Y-Ba-Cu-O Physical Review B. ,vol. 35, pp. 8782- 8784 ,(1987) , 10.1103/PHYSREVB.35.8782
M. Taibi, J. Aride, J. Darriet, A. Moqine, A. Boukhari, Structure cristalline de l'oxyde Nd2BaZnO5 Journal of Solid State Chemistry. ,vol. 86, pp. 233- 237 ,(1990) , 10.1016/0022-4596(90)90138-N
I. D. Brown, D. Altermatt, Bond‐valence parameters obtained from a systematic analysis of the Inorganic Crystal Structure Database Acta Crystallographica Section B-structural Science. ,vol. 41, pp. 244- 247 ,(1985) , 10.1107/S0108768185002063