Phase Formation and Thermal Stability of fcc (Fluorite) Ce1−xTbxO2−δ Solid Solutions


Vries, K.J. de and Meng, G-Y. (1998) Phase Formation and Thermal Stability of fcc (Fluorite) Ce1−xTbxO2−δ Solid Solutions. Materials Research Bulletin, 33 (3). pp. 357-367. ISSN 0025-5408

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Abstract:Ce1−xTbxO2−δ solid solutions (x = 0.3, 0.4, and 0.5) were synthesized by a coprecipitation method, using ammonia. The formation process of the solid solutions was studied as a function of temperature up to 1200°C by X-ray diffraction, thermogravimetric analysis, and differential scanning calorimetry. The results showed that chemically homogeneous, oxidic fcc structures were formed. The large increase (1.5%) of the fcc unit-cell parameter on increase of temperature in ambients of oxygen or nitrogen could be correlated with changes in the oxygen stoichiometry (≈3.5%) that have led to a reversible change in the valence state from (IV) to (III) of a fraction of the Ce and Tb ions. The fcc structure was chemically and structurally stable to at least 1200°C.
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Copyright:© 1998 Elsevier
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Metis ID: 106530