摘要
In the current work,the bulk ternary(0.85-x)BiFeO3-xBaTiO3-0.15PbTiO3(BF-BTx-PT,x=0.08-0.35)system has been studied as a potential high-temperature piezoceramics.Samples with various content of BT were prepared via solid-state route,and pure perovskite phase was confirmed by X-ray diffraction.The temperature dependence of dielectric constants confirmed the decrease of Curie temperature with increasing BT content.It was found that the morphotropic phase boundary(MPB)composition of BF-BTx-PT ceramics was in the vicinity of x=0.15,which exhibits optimal properties with piezoelectric constant d33 of 60 pC/N,high Curie temperature of 550℃,and low sintering temperature of 920℃.Measurements also showed that the depoling temperature was 300℃,about 150℃higher than that of commercialized PZT ceramics,which indicated good temperature stability.BF-BTx-PT ceramics are promising candidates for high temperature applications.
基金
the support of the Key Programmer of Natural Science Foundation of China(No.50932004)
the International Technology Cooperation Project from the Ministry of Science and Technology of China(No.2011DFA52680)
the National Natural Science Foundation of China(No.51102189)
the Key Grant Project of Chinese Ministry of Education(No.309022)
the program for New Century Excellent Talents in University(No.NCET-11-0685)
the Fundamental Research Funds for the Central Universities(No.2012-IV-006).
