Powder diffraction study of arsenic-substituted nasicon structures MeZr2As(3-x)PxO12 (Me=Na+, K+)

Three new mixed oxides having the nasicon structure and containing arsenic( V) as tetrahedral ion were prepared and X-ray analyzed. The stoichiometry o f the three phases can be expressed by the comprehensive notation MeZr2As(3 -x)PxO12 where Me stands for Na+ or K+, x equals to 0 and 1.5 when Me=Na, w hile x equals to 1.5 when Me=K. For two other compositions of the above ser ies, the powder patterns were calculated on the basis of the structural dat a from single crystal determinations, thus permitting us to complete the ch aracterization of the solids, with nasicon framework, deriving from MeZr2P3 O12 (Me=Na+, K+) by partial (50%) or complete (100%) substitution of As for P. (C) 1998 International Centre for Diffraction Data. [S0885-7156(98)0030 2-9].