Abstract: Ba(Mg_1/3Ya_2/3)O₃ solid-state formation reactions and its sinterability were studied in relation with different raw materials, Ta₂O₅·xH₂O and T₂O₅ raw materials with different
phase structure and grain size were employed as the source Ta₂O₅, along with BCO₃ and MgO. The experiment results indicated that the adoption of
Ta₂O₅·xH₂O can retard the intermediate phase and leads to more complete reaction at lower temperature than that with Ta₂O₅, which is
due to the local stoichiometric homogeneities of the mixed powder and the phase transformation Ta₂O₅ from Ta₂O₅·xH₂O. The sinterability
of the powder prepared from Ta₂O₅·xH₂O is much better than that of the powder from Ta₂O₅.

Key words: reaction process, sinterability, Ta₂O₅·xH₂O