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|Title:||Structure and redox properties of CexSn1-xO2 mixed oxides|
|Abstract:||A variety of CexSn1-xO2 mixed oxides has been synthesized and their structure and redox properties have been studied. The structure of CexSn1-xO2 mixed oxides depends on values of 'x' and calcination temperature. When x=l.0~0.8, CexSn1-xO2 mixed oxides are in cubic phase; on decreasing x from 0.7 to 0.1, CexSn1-xO2 mixed oxides are observed to have cubic and tetragonal mixed phases; and single SnO2 is in a tetragonal phase. Only small amounts of SnO2 can be introduced into the CeO2 lattice to form cubic phase, and excess SnO2 is in tetragonal phase. Low calcination temperatures favour formation of Ce0.7Sn0.3O2 solid solutions, while high calcination temperatures do not favour formation of solid solutions and lead to sample sinters. Combined with DTA result, we believe the Ce0.7Sn0.3O2 mixed oxides are formed during the decomposition of the dried sample at about 300 oc. The mixed oxides have three reduction peaks (α, β and γ). The peak α is attributed to the reduction of the easily reducible surface Sn4+ The peak β is attributed to the overlapping peak of the reduction of bulk oxygen of SnO2 and the easily reducible surface Ce4+. The peak γ is ascribed to the reduction of bulk CeO2. The intensity and temperature of reduction peaks are affected by x values and calcination temperatures.|
|Appears in Collections:||IJC-A Vol.40A(01) [January 2001]|
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