Grain size dependence of dielectric and field-induced strain properties of chemical prepared (Pb, La)(Zr, Sn, Ti)O3 antiferroelectric ceramics

Dielectric and field-induced strain properties of (Pb, La)(Zr, Sri, Ti)O-3 antiferroelectric ceramics with average grain size ranging from 2.0 to 9.0 mum were investigated experimentally. PLZST powders were synthesized by a two-step wet chemical method using colloidal processing. Dense samples were prepared by tape-casting method and sintered from 1000 to 1250 degreesC for 2 h at 50 degreesC intervals to obtain various grain sizes. The dielectric constant of the samples show a maximum at an average grain size of 5 mum and the transformation temperature form antiferroelectric to paraelectric phase shifts to higher temperature with the increase of grain size. The field-induced strain is strongly dependent to grain size, showing a maximum longitudinal strain of 0.38% at an average grain size of 5 gm. (C) 2002 Elsevier Science Ltd and Techna S.r.l. All rights reserved.