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- W2035006543 abstract "Par action de l'ammoniac à 900-950°C sur les tantalates de terres rares LnTaO4, on a mis en évidence une nouvelle famille d'oxynitrures dont la structure est de type pyrochlore. Ces composés Ln2Ta2O5N2 ont été obtenus pour les lanthanides de rayon inférieur ou égal à celui du néodyme, ainsi que pour l'yttrium. La maille cristalline est de symétrie cubique (10,2 Å < a < 10,6 Å). La stoechiométrie anionique impose un désordre oxygène-azote au moins partiel entre les deux sites cristallographiques correspondants. New oxynitrides Ln2 Ta2O5N2 (Ln = Nd → Yb, Y), belonging to the pyrochlore type structure, have been prepared by heating at 900-950°C the LnTaO4 corresponding tantalates. The a parameter of the cubic unit cell is comprised between 10.2 and 10.6 Å. Because of the anionic stoichiometry, oxygen and nitrogen atoms are disordered, at least partially." @default.
- W2035006543 created "2016-06-24" @default.
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- W2035006543 date "1993-11-01" @default.
- W2035006543 modified "2023-09-25" @default.
- W2035006543 title "Une nouvelle famille de pyrochlores: les oxynitrures Ln2Ta2O5N2. Préparation et étude cristallochimique" @default.
- W2035006543 doi "https://doi.org/10.1006/jssc.1993.1321" @default.
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