Abstract
The diphosphate NaCeP 2O 7 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) Å, V = 577.51(5) Å 3, Z = 4 and R( F 2) = 0.0323 for 674 reflections ( F o 2 ≥ 2 σ( F o 2)) with R w( F 2) = 0.0775, refined with 62 parameters. The structure of NaCeP 2O 7 consists of P 2O 7 4− diphosphate groups which are extended along two perpendicular directions. In the case of the orthorhombic NaCeP 2O 7, 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 NaO 9 polyhedra running parallel to the b direction. The conductivity of the NaCeP 2O 7 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.
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