Journal
EUROPHYSICS LETTERS
Volume 50, Issue 6, Pages 810-815Publisher
EDP SCIENCES S A
DOI: 10.1209/epl/i2000-00553-2
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Ageing properties of weak field dielectric constant and losses of (Rf, Zr)-doped BaTiO3 ceramics in various crystalline phases are studied, and compared with those of pure tetragonal BaTiO3 ceramics. At room temperature, the ageing process develops following two different mechanisms: a thermally activated ageing process in pure tetragonal ceramics and a defects diffusion for the doped ceramics. We consider that the main reason for the different ageing mechanisms is the crystalline symmetry, which influences the twinning process and the domain-wall dynamics. Our results prove that ageing of (Hf, Zr)-doped BaTiO3 ceramics depends on temperature by intermediate of the phase symmetry, which imposes the twinning rate and rearrangement of ferroelectric domains minimizing the elastic energy of the lattice.
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