Effects of La-Doping on Phase Structure and Electrical Properties of Pb(Mg1/3Nb2/3)0.67Ti0.33O3 Ceramic

Yong Liu; Rui Qing Chu; Zhi Jun Xu; Shu Ting Wang; Qing Bin Chi; Li Ming Wu; Hui Qin Lv; Guo Rong Li

doi:10.4028/www.scientific.net/AMR.622-623.767

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 622-623Effects of La-Doping on Phase Structure and...

Effects of La-Doping on Phase Structure and Electrical Properties of Pb(Mg_1/3Nb_2/3)_0.67Ti_0.33O₃ Ceramic

Abstract:

La-doped Pb(Mg1/3Nb2/3)0.67Ti0.33O3 ceramics were fabricated by a two-stage sintering method from conventional raw materials. The effects of La doping on the phase structure and electrical properties of ceramics were investigated. X-ray diffraction analysis showed that the pyrochlore phase increased with the increase of La-doping level. The effects of La doping on the dielectric, ferroelectric and piezoelectric properties of the ceramics were also investigated. The results showed that La doping seriously weakened the electrical properties of the ceramics. The ceramics possess optimum properties (d33=239pC/N, Pr=10.6μC/cm2, Ec=8.5kV/cm, tanδ=0.029, εr = 2250) when the doping level is low (x = 0.02).