Pb(Zr,Sn,Ti)O3反铁电陶瓷场诱相变性能的改进

为了获得场诱反铁电(AFE_t)—铁电(FE_Ｒ)相变临界电场E_{f小、电滞ΔE小、场致应变x适当的反铁电陶瓷，对Pb(Zr, Sn, Ti)O3采用Ba ^2＋置换Pb^2＋，同时在四方反铁电相AFEt—三方铁电F EＲ相界附近调节Ti/Sn比，来控制FEＲ-AFEt,AFEt关键词： Pb(Zr Sn 3基反铁电陶瓷')" href="#">Ti)O3基反铁电陶瓷 场诱相变 场致应变 掺杂改性}

ELECTRIC FIELD INDUCED ANTIFERROELECTRIC TO FERROELECTRIC PHASE TRANSITION OF Pb (Zr,Sn,Ti)O3 CERAMICS AND TAILORING OF PROPERTIES THROUGH COMPOSITION MODIFICATION

In order to obtain a new kind of antiferroelectric (AFE_t) ceramics wi th lower AFE_t-Ferroelectric (FE_R) switching field E_{f< /sub> and less hysterisis loss ΔE for application of large displacement actuato r, Ba²⁺ ionics was employed to control the relative stability between AFEt, FER, and parroelelctrics (PEc) phases in (Pb097-xBaxLa002)(Zr055Sn035Ti01)O3 (0≤x≤02) system. Structural chan ges and electric properties as a function of Barium content x have been investig ated by X-Ray diffraction, dielectric properties, polarization and longitudinal strain measurement. It is observed that AFEt changes to FER, and finally to ferroelectric relaxors(RFE) as Ba content x increases from zer o to 02. Based upon these expermental result, we are able to tailor the AFE-FE switching parameters such as Ef, ΔE and AFEt operating t emperature range ΔT through modifying the Ti/Sn ratio near AFEt/FER} phase boundary in the (Pb_087Ba_01La_{00 2})(Zr_06Ti_ySn_04-y)O₃ (004 ≤y≤009) system. Finally, a new kind of AFE_t ceramics with E_f =16kV/mm，ΔE=085kK/mm， and longitudinal strain x=01%—02% which is appropriate for application of digital actuators has been obtained. Phase dia gram with composition located near AFE_t/FE_R boundary of t he studied system has been determined.