Verres Céramiques Composites
Volume 4, Numéro 2, Pages 16-28
2015-12-28

Synthesis And Crystal Structure Of Pseudo-binary: (1-x) Tlnbo3 -xbi2o3 0≤x≤ 1



Authors : El Baharai Ghizlane . Chagraoui Abdeslam . Ourayach Brahim . Tairi Abdemadjid . Ait Sidi Ahmed Omar .

Abstract

Different compositions of pseudo-binary (1-x)NbTlO3 -xBi2O3 were prepared with0≤x≤1. New defect pyrochlore oxide (1-x)NbTlO3 -xBi2O3 where x=0.091Tl0.909Nb0.909Bi0.182O3 has been isolated as polycrystalline powder giving X-ray diffraction patterns characteristic of defect pyrochlore, space group Fd-3m (n°227), with lattice parameter: a=10.6368(2)Å,(Z=8). Rietveld refinements of X-ray powder diffraction data indicate that the atomics positions are: Tl (32e), Bi and Nb in 16c. O occupied the sites 48fand 8b respectively. The reliability factors are: RF=6.59%,Rwp= 8.62%, RB=5.40%.For 0.091≤x <0.8 we noted mixture of phases situated in ternary system and for 0.8≤ x <1 we have stabilised δBi2O3.

Keywords

Diffraction X, Fullprof, pyrochlore, reliabilité

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