Flash Sintering Effect on PMN-PT Ceramics

Türkçe

Densification of PMN-PT piezoelectric ceramic powder is carried out by electric field assisted/flash sintering method. The composition selected in PMN-PT materials system is 0.67[Pb(Mg1/3Nb2/3)O3]−0.33(PbTiO3). During flash sintering experiment, 200 V/mm electric field is applied on sample with 0.1 amp current cutoff value. Flash sintering is accomplished in less than 90 sec at ~700 °C. Relative density for sintered sample is measured approximately 94 % which is reasonable value comparing with literature. SEM microstructure illustration exhibits proper consolidation morphology which is agreement with the relative density measurement. According to XRD analysis, the said materials system shows consistency in rhombohedral perovskite crystal structure and preserve its chemical and physical composition during whole experimental cycle. By electric field assisted/flash sintering technique, the sintering temperature is decreased from 1200 °C to 700 °C along with a decrement in sintering time from 2 hours to 90 seconds. PMN-PT is properly produced by flash sintering method for the first time with respect to open literature. Hence, this densification method will gain importance to reduce toxic Pb emission aroused at high temperature processes.