화학공학소재연구정보센터
Solid State Ionics, Vol.176, No.23-24, 1949-1953, 2005
Structure and ionic conductivity of NaCeP2O7
The diphosphate NaCeP2O7 was synthesized and its structure was determined from single crystal X-ray data. The title compound crystallizes in the orthorhombic space group Pnma with: a=8.6224(4), b=5.2823(3), c=12.6796(6) angstrom, V=577.51(5) angstrom(3), Z=4 and R(F-2) =0.0323 for 674 reflections (F-0(2) >= 2 sigma(F-0(2))) with R-w(F-2) =0.0775, refined with 62 parameters. The structure of NaCeP2O7 consists of P2O74- diphosphate groups which are extended along two perpendicular directions. In the case of the orthorhombic NaCeP2O7, cerium cations are ninefold coordinated and diphosphate groups have a symmetry plane. The sodium cations are coordinated by nine oxygen atoms and build ribbons of NaO9 polyhedra running parallel to the b direction. The conductivity of the NaCeP2O7 sample was studied over a temperature range from 293 to 840 K. Transport properties in this material appear to be due to Na+ ions' hopping mechanism. (c) 2005 Elsevier B.V. All rights reserved.