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Sol-gel routes were used to prepare Ta 10at% and Nb 5at% and 10at% doped titania nanosized powders. When fired between 410 o C and 850 o C the doped titania powders are in the anatase phase; further heating up to 1050 o C is required to obtain the rutile phase. The presence of dopant atoms delays the rate of transformation as compared with pure titania powders. Doping also...
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