Correlation between surface texture and chemical composition in undoped, hard, and soft piezoelectric PZT ceramics
- Autor: Hammer, M; Monty, C; Endriss, A; Hoffmann, MJ
- Quelle: JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1998, Band 81, Heft 3, S. 721–724
- Correlation between surface texture and chemical composition in undoped, hard, and soft piezoelectric PZT ceramics.
Abstract
The electrical and mechanical properties of piezoelectric lead
zirconate titanate (PZT) ceramics are strongly influenced by
domain-wall motion, which can be tailored via the substitution of ions
within the perovskite structure, Different domain mobilities are
achieved by lead and/or oxygen vacancies, according to the valency and
ionic radius of the dopants, To quantify the surface near domain
mobility, hard (silver-doped), soft (lanthanum-doped), and undoped PZT
ceramics have been prepared, An applied mechanical stress after
sintering causes texturing near the surface, because of the
ferroelastic behavior of the 90 degrees domains, The texture is
quantified via X-ray diffractometry (XRD) analysis of the tetragonal
F-T(002)- and F-T(200)-peak intensities, using least-squares refinement
with Gaussian profile functions, The samples are subsequently annealed
to remove the surface texture and again characterized via XRD
measurements, However, annealed samples still reveal a preferred domain
orientation that can be removed only by a second annealing of the
pulverized samples, A comparison of the tetragonal additive systems
clearly reveals the greatest domain mobility for lanthanum-doped PZT
ceramics, whereas the silver-doped and undoped samples have similar
ferroelastic behavior, Furthermore, the surface texture of all the
compositions is dependent on the applied mechanical stress and cannot
be removed completely by heat treatment.