UFAS1 PLATFORM EVENTS, International Conference on Materials Science ICMS2018

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Synthesis and Structural characterization of tin Gadolinium Pyrochlore Gd2-xSrxSn2O7- ( 0 ≤ x ≤ 0.5 ) solid-oxide fuel cells (SOFC)
FATIMA fati MELIT

Last modified: 2018-08-02

Abstract


Materials with the pyrochlore lattice structure have attracted much recent attention due to their wide applications in ceramic thermal barrier coatings , high-permittivity dielectrics, potential solid electrolytes in solid-oxide fuel cells , and immobilization hosts of actinides in nuclear waste Pyrochlores oxides are oxides of general formula A2B2O7; the site A may be occupied by Na, Ca, Sr, Mn, La, etc.; site B can be occupied by Nb, Ta, Ti, Sn and O.. They are named after mineral pyrochlore (NaCa) (NbTa) OBF / (OH). The ideal A2B2O7 pyrochlore structure is commonly described as a derivative of the fluorite structure where the scheduling of type A and B cations at two sites results in a doubling of the unit cell to about 10.5 The oxide can be written A2B2O6O' with cubic coordination space group Fd-3m.

The work described in this paper is devoted to the synthesis and characterization of a pyrochlore structure based on Gadolinium (Gd2O3) and tin (SnO2) oxides of general formula Gd2Sn2O7, substituted by Sr at the site Gd . Their structures were determined from X-ray powder diffraction using Rietveld analysis. All the compositions present the space group Fd-3m.

The substitution of Gd by Sr in the Gd2Sn2O7 compound causes a variation of the cell parameters.