Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3 Textured Ceramics with High Piezoelectric Response by a Novel Templated Grain Growth Approach

摘要

Pb(Mg_(1/3)Nb_(2/3_)O_3-PbTiO_3 is used as a model system of perovskite solid solutions with very high piezoelectric response at tailored morphotropic phase boundaries to demonstrate the processing of textured ceramics by ceramic-only technology. A novel homogeneous templated grain growth approach that uses conventional ceramic procedures and a single-source nanocrys-talline powder for the matrix and also for obtaining the templates is described. Two batches of (100) faceted cube-shaped microcrystals with average sizes of 27 and 10 urn were successfully used as templates, and aligned by tape casting for the processing of ＜001＞-textured Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3 piezoelectric ceramics. Materials with effective piezoelectric coefficients up to 1000 pC/N and ferroelectric properties approaching those of single crystals are obtained.