【摘要】 采用密闭油腔产生静压力,样品置于油腔内,测试了(001)切型弛豫铁电单晶0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3(简写为PMNT67/33)的介电常数和静水压压电常数的压力稳定性。结果显示:随压力增大,εr缓慢增加,压力在10MPa内其相对变化小于1.8×10-2,tgδ无显著变化;压电常数dh和gh先显著下降,至2MPa后趋于稳定。结果表明,弛豫铁电单晶PMNT施加一定的预应力后,性能随静压力的变化趋于稳定。更多还原

【Abstract】 The single crystal sample 0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3(PMNT67/33) with(001) cut was put into an airtight chamber,which was filled with the compressed silica oil to create a certain hydrostatic pressure.Then the variety of piezoelectric coefficient and dielectric properties of the sample with hydrostatic pressure was measured in pressure surrounding.The results show that the permittivity increases slowly with the pressure and the relative variety is less than 1.8×10-2 within the pressure of 10 MPa while the dielectric loss has no observable change with the pressure and its value is less than 0.01.The piezoelectric coefficient dh and gh descend evidently from 0 to 2 MPa first and then have almost no changes from 2MPa to 10 MPa.The investigation proves that the properties of single crystal PMNT67/33 are stable within the hydrostatic pressure of 10 MPa after applying pre-stress(2 MPa) on the crystal.更多还原