Donor-doped Pb(Zr_xTi_1-x)O₃ (PZT) ceramics possess various enhanced electrical and mechanical properties and are therefore frequently used in industrial applications. Despite extensive studies the microstructure of the morphotropic phase boundary (MPB) in these ferroelectric materials is still under discussion. Whereas some groups (Noheda et al [1]) fitted diffraction data by monoclinic symmetry, other groups describe the MPB as composed of a complicated system of micro- and nanodomains [2].

It would be of interest to draw a correlation between the structural stability range and enlarged dielectric properties called forth by nanodomains and the effects called forth by small percentages of dopand within the structure. A question now arising is how the stability field of nanodomain structures varies with Temperature in PLZT.

Temperature dependent synchrotron powder diffraction investigations at the beamline B2, Hasylab Hamburg across the entire compositional range of the MPB show changes in phase fractions, domain structure and phase transitions dependent on the nanodomain content. Temperatures from 20 K to 800 K were applied to PLZT compositions in the compositional range from x = 0.525 to x = 0.560 doped with 1% Lanthanum. The results will be discussed and compared with results from undoped PZT [3].

[1]   Noheda et al., Phys. Rev. B 61 (2000).

[2]   L. A. Schmitt et al., J. Appl. Phys. 101, 074107 (2007).

[3]   K.A. Schoenau, PhD Thesis (2007).

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