Research on piezoeletric ceramic material with high piezoelectric coefficient and high Curie temperature

Abstract

At laboratory condition,performances of Pb[(Zn_(1/3)Nb_(2/3))_xZr_yTi_(1-x-y)]O_3 are studied experimently.Changing the ratio of Zr/Ti,replacing Pb with La and changing mol fraction of Pb(Zn_(1/3)Nb_(2/3))O_3,piezoelectric coefficient d_(33) and Curie temperature T_c may change greatly.Replacing Pb with a few La,d_(33) may increase effectively,meanwhile,T_c decreases apparently.As mol fraction of Pb(Zn_(1/3)Nb_(2/3))O_3 increases,d_(33) value increases relatively,T_c decreases lightly.When the ratio of Zr/Ti equals to 33.5/36.5, x equals to 0.34,the performances of material are optimum.In this case,d_(33),T_c,K_p(electro-mechanical coupling factor)and e~T_r(permittivity) could be 460×10~(-12)C·N~(-1),280 ℃,0.59,2 400 respectively.