MIZOGUCHI, Hiroshi; WATTIAUX, Alain; KYKYNESHI, R.; TATE, J.; SLEIGHT, A. W.; SUBRAMANIAN, M. A.

doi:10.1016/j.materresbull.2008.03.011

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MIZOGUCHI, Hiroshi
Department of Chemistry

WATTIAUX, Alain
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

KYKYNESHI, R.
Department of Physics

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Materials Research Bulletin. 2008, vol. 43, n° 8-9, p. 1943-1948

Elsevier

Résumé en anglais

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.< Réduire

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Oxides

Mossbauer spectroscopy

X-ray diffraction

Dielectric properties

Optical properties

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Synthesis and characterization of Sn2+ oxides with the pyrochlore structure

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