铁掺杂0．2PZN-0．8PZT铁电陶瓷Raman散射研究

Raman Scattering Studies on Fe_2O_3-modified 0.2PZN-0.8PZT Piezoceramics

采用Raman散射方法研究了铁掺杂Pb(Zn1／3Nb2／3)0．2(Zr0．5Ti0．5)0．8O3(0．2PZN- 0．8PZT)铁电陶瓷中三方-四方共存现象．通过分析四方相E(3TO)和A1(3TO)模式与三方相 R1模式之间的相对强度,以及四方相E(3LO)和A1(3LO)模式与三方相Rh模式之间的相对强度,确定了铁掺杂对0．2PZN-0．8PZT陶瓷中三方-四方共存结构的影响,并得到了XRD相分析的验证．因此,通过分解Raman散射中三方-四方振动模式,可以表征掺杂对PZT基陶瓷中三方-四方共存现象的变化趋势．

Raman scattering spectroscopy is widely used to investigate the phase transition of ferroelectrics, including the ferroelectric-paraelectric transition. In the present paper, the phase coexistence of rhombohedral and tetragonal phases caused by Fe2O3 doping in Pb（Zn1/3Nb2/3）0.2 （Zr0.5Ti0.5）0.8O3（0.2PZN-0.8PZT） ceramics was investigated by Raman scattering spectroscopy in detail. On the basis of the Raman scattering analysis on the tetragonal E（3TO） and A1 （3TO） modes and the rhombohedral R1 mode, or on the tetragonal E（3LO） and A1 （3LO） modes and the rhombohedral Rh mode, the tendency of phase transition induced by Fe2O3 doping was evaluated, which has been affirmed by XRD results. This indicates that Raman scattering analysis is an effective way to investigate the doping effect on the phase coexistence in PZT based ceramics.