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a mixed solution of 9.4 mL of
Ca(NO 3 ) 2 ¡¤4H 2 O (1.0 M) and 2.4 mL of Ce(NO 3 ) 3 ¡¤6H 2 O (1.0 M)
was added to 9.0 g of La 2 O 3 powder. The mixture was kneaded
thoroughly and aged and dried at 23
? C for 24 h. The dried
solids were then heated in air at a rate of 10
? C min -1
to 500
? C
and held there for 30 min in air

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