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The mesoporous solid solutions of CeO2 - ZrO2 prepared in this work showed a higher stability against thermal ripening than both binary oxides , making them ideal model systems to study both the charge transport properties and the oxygen storage at elevated temperatures .
 Chemical: CeO2; Chemical: ZrO2
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: CeO2; Chemical: ZrO2