抄録
The phase transformation and densification behavior of (Pb1-X2+La2X/33+)5Nb10O30 (X=0.00-0.20) tungsten bronze (TB)-type compounds were studied with respect to La3+ ion substitution for Pb2+ ion in Pb5Nb10O30. Analysis of the phase identification shows that the phase transformation temperature (low temperature rhombohedral form ↔ high temperature tetragonal form) decreases along with the increase of La3+ amount. The decrease of phase transformation temperature limits excessive grain growth, which usually occurs from the co-proceeding of phase transformation and sintering in Pb5Nb10O30 and, as a result, the density after sintering is effectively improved. Furthermore, two different densification models for Pb5Nb10O30 and (Pb1-X2+La2X/33+)5Nb10O30 were described and discussed.
