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, Sn, Ti)O3 antiferroelectric ceramics with average grain size ranging from 2.0 to 9.0 μm 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 °C for 2 h at 50 °C intervals to obtain various grain sizes. The dielectric constant of the samples show a maximum at an average grain size of 5 μm 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 μm.