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a b s t r a c tA sol-gel processing was used to synthesize MgTa 2 O 6 nano-powders at a low temperature using Ta 2 O 5 as starting materials. The decomposition of precursors, and the crystal structure and microstructure of the MgTa 2 O 6 powders were characterized by DTA/TG, XRD and SEM techniques. The effects of the amount of citrate acid and pH values on the stability of sol-gel solution and microstructure of MgTa 2 O 6 nano-powders were investigated. XRD and TG/DTA results show that the MgTa 2 O 6 nano-powders can be synthesized at 900 • C, and non-stoichiometric ratio of Mg to Ta was required to form the single MgTa 2 O 6 phase. The average particle sizes of MgTa 2 O 6 powders range from 25 nm to 100 nm with different CA/Ta and pH values.

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