Abstract
RWO 3 N oxynitrides were isolated as single phases for R=Nd and Pr, after thermal ammonolysis of reactive precursors prepared using the citrate complexation/calcination route. Both stoichiometric compounds crystallize with a scheelite-type tetragonal unit cell, with a =5.2821(3) Å, c =11.5893(8) Å (NdWO 3 N) and a =5.299(3) Å, c =11.631(9) Å (PrWO 3 N). Neutron diffraction experiments performed on the Nd-phase did not evidence any oxygen/nitrogen order within the scheelite anionic subnetwork (space group: I 4 1 / a ). (Nd,A)W(O,N) 4 (A=Ca, Sr) solid solution domains were identified between NdWO 3 N and the AWO 4 oxide composition.
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