论文部分内容阅读
用固相烧结法,在1200℃烧结2.5h的条件下,制备了(Pb0.97La0.02)(Zr0.66Sn0.23Ti0.11)O3(PLZST)四方相陶瓷和陶瓷粉末,并将其与聚偏氟乙烯-三氟乙烯[polyvinylidenefluoridetrifluoroethylene,P(VDFTrFE)]相复合制备了70%(体积分数)PLZST/P(VDF TrFE)复合材料。用3～4MeV、剂量为60Mrad的电子束对PLZST陶瓷及其复合材料进行处理,测量其辐照前后的介电温谱,研究其弛豫性能的变化。结果表明:电子束辐照对PLZST陶瓷的介电温谱几乎没有影响,没有改变它的非弛豫特征;70%PLZST/P(VDFTrFE)复合材料由于两相界面间的耦合作用产生微畴而具有弛豫特征,而辐照处理对P(VDFTrFE)内部铁电宏畴的破坏使得其弛豫性能得到显著改善,从而获得了一种良好的弛豫型复合材料。
(Pb0.97La0.02) (Zr0.66Sn0.23Ti0.11) O3 (PLZST) tetragonal ceramics and ceramic powders were prepared by solid-state sintering at 1200 ℃ for 2.5h, and then mixed with poly 70% (volume fraction) PLZST / P (VDF TrFE) composites were prepared by the combination of polyvinylidenefluoridetrifluoroethylene (P (VDFTrFE)]. The PLZST ceramics and their composites were treated with 3 ~ 4 MeV and 60 Mrad electron beam, and their dielectric properties were measured before and after irradiation. The relaxation behavior was investigated. The results show that electron beam irradiation has little influence on the dielectric temperature spectrum of PLZST ceramics, and does not change its non-relaxation characteristics. The microstructure of 70% PLZST / P (VDFTrFE) composites is due to the coupling effect between two phases, Has relaxation characteristics, and the damage of the IRFs to the internal ferroelectric domain in P (VDFTrFE) caused the relaxation performance to be significantly improved, resulting in a good relaxation-type composite material.