XRD Analysis for the Formation of Sr_(0.4)Ba_(0.6)Nb_2O_6 Phase

The phase assembles of Sr0.4Ba0.6Nb2O6 (SBN40) starting powder mixture calcined at different temperatures were identified by X-ray Guinier-Hagg camera film data and the unit cell dimensions of strontium barium niobate (SBN) developed at different temperatures were calculated by using PIRUM program. It was found that four intermediate phases, i.e., Na5Nb4O15, Sr5Nb4O15, SrNb2O6 and BaNb2O6 were developed during the formation of Sr0.4Ba0.6Nb2O6 and the two latter phases reacted to form SBN. The unit cell dimensions of SBN decreased with increasing sintering temperature. On the basis of results, the corresponding formation mechanism of Sr0.4Ba0.6Nb2O6 phase was also suggested.