Synthesis and characterization of Sn2+ oxides with the pyrochlore structure

Hiroshi Mizoguchi (1) , Alain Wattiaux (2) , R. Kykyneshi (3) , J. Tate (3) , A. W. Sleight (1) , M. A. Subramanian (1)

1 Department of Chemistry
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
3 Department of Physics

During synthesis of View the MathML source compounds with the pyrochlore structure, some disproportionation of the Sn2+ always occurred. This in turn led to some incorporation of Sn4+ into the octahedral (M) sites of the pyrochlore structure. The actual amount of Sn4+ incorporation was determined by 119Sn Mössbauer spectroscopy for two compounds. Mössbauer spectroscopy also indicated that Sn2+ was strongly displaced from its ideal site in the pyrochlore structure. The compounds Sn2TiNbO6F, Sn2Ti0.9Ta1.1(O,F)7, View the MathML source, and View the MathML source with the pyrochlore structure are yellow to red with band gaps determined from diffuse reflectance ranging from 1.9 to 2.3 eV. The dielectric constant of Sn2+ pyrochlores examined ranged from 31 to 149.

Mots clés: Oxides; Mossbauer spectroscopy; X-ray diffraction; Dielectric properties; Optical properties

Domaines: Matériaux

Hiroshi Mizoguchi, Alain Wattiaux, R. Kykyneshi, J. Tate, A. W. Sleight, et al.. Synthesis and characterization of Sn2+ oxides with the pyrochlore structure. Materials Research Bulletin, 2008, 43 (8-9), pp.1943-1948. ⟨10.1016/j.materresbull.2008.03.011⟩. ⟨hal-00295315⟩