Research On The Preparing Process And Properties Of PZT Based Ceramics

A new method for preparing PZT powder and ceramics is proposed. PZT powders were prepared via wet-dry method. Oxide of B-site ions of perovskite PZT was prepared via the polymeric method as B-site precursor. The precursor is ZrxTi1-xO2 solid solution of single phase with ZrTiO4 structure. The composition range (x=0.50~0.56) exceeds the limit of that of conventional solid solution method. PZT powder was formed from solid reaction between this B-site precursor and PbCO3. The calcination temperature can be lowered remarkably to 725℃. Fine powder with average particle size of 130 nanometers was obtained. The sinter temperature of the PZT ceramics with niobium dopant can be lowered to 1130℃. The dielectric property of PZT ceramics with niobium dopant is more stable than that of pure PZT ceramics while temperature becomes high. The ceramics prepared by this wet-dry method exhibits excellent dielectric properties.Ternary perovskite ceramics of Pb[(Zr0.5Ti0.5)0.8-x(Mg1/3Nb2/3)0.2+x]0.98Nb0.02O3.01 (PZTMN, x=-0.075, -0.05, -0.025, 0, 0.025, 0.05, and 0.075 ), are synthesized via dry-dry method. B-site precursors of PZTMN ([(Zr0.5Ti0.5)0.8-x(Mg1/3Nb2/3)0.2+x]0.98Nb0.02O2.01, ZTMN) can be synthesized via a two-step solid state reaction method. The first calcination temperature is 1300℃, and the second is not higher than 1360℃. Incorporation of magnesium and niobium ions promotes the formation of the single phase solid solution with ZrTiO4 structure. Single phase perovskite PZTMN is formed at 780℃, much lower than that in conventional process. Dense ceramics can be sintered at about 1260℃with dielectric and piezoelectric properties comparable to that of wet-dry method and higher than that of conventional method. It seems that B-site precursor method is cost effective in preparation of ternary piezoelectric ceramics.