THE NOVEL R2BA1.25NIO5.25 (R = TM, YB, LU) STRUCTURE TYPE

被引：12

作者：

CAMPA, JA

GUTIERREZPUEBLA, E

MONGE, MA

RASINES, I

VALERO, CR

机构：

[1] CSIC,INST CIENCIA MAT,SERRANO 113,E-28006 MADRID,SPAIN

[2] UNIV COMPLUTENSE MADRID,FAC CIENCIAS GEOL,DEPT CRISTALOG & MINERAL,E-28040 MADRID,SPAIN

[3] UNIV COMPLUTENSE MADRID,FAC CIENCIAS QUIM,CSIC,DIFRACC GRP,E-28040 MADRID,SPAIN

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 1991年 / 95卷 / 02期

关键词：

D O I：

10.1016/0022-4596(91)90117-Z

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Crystals of isostructural R2Ba1.25NiO5.25 (R = Tm, Yb, Lu) have been grown and characterized. The crystal structure for R = Yb has been established from X-ray single crystal diffraction data. R2Ba1.25NiO5.25 are tetragonal, S.G. I4 m (No. 87), with unit-cell parameters a = b = 13.582(3), 13.553(4), and 13.549(3) A ̊, c = 5.656(2), 5.638(2), and 5.633(2) A ̊, V = 1043.4(8), 1035.6(9), and 1034.1(8) A ̊3 for R = Tm, Yb, and Lu, respectively; and Z = 8. Interatomic distances and principal angles are given for the Yb compound. The crystal structure of Yb2Ba1.25NiO5.25 is formed by square NiO5 pyramids, trigonal YbO7 prisms capped on one rectangular face, tetragonal bicapped Ba(1)O10 prisms, and irregular Ba(2)O10 polyhedra. A comparison is made between this structure type and those of Yb2BaNiO5 and Y2BaNiO5: the RO7 polyhedra look similar for the three types, and Yb2Ba1.25NiO5.25 contains NiO5 groups similar to those of Yb2BaNiO5 as well as Ba(2)O10 units which are shaped like those present at Y2BaNiO5. © 1991.

引用

页码：360 / 364

页数：5

共 14 条

[1] ER2BANIO5 - STRUCTURE REFINEMENT USING NEUTRON POWDER DIFFRACTION DATA [J].