TY - JOUR
T1 - Mixed conduction and chemical diffusion in a Pb (Zr0.53, Ti 0.47) O3 buried capacitor structure
AU - Donnelly, Niall J.
AU - Randall, Clive A.
N1 - Funding Information:
This work was funded through the membership of the Center for Dielectric Studies and the NSF I/UCRC program (Grant No. 0628817).
PY - 2010
Y1 - 2010
N2 - Impedance spectroscopy is performed on a buried capacitor structure composed of a PZT-0.75% Nb ceramic with platinum electrodes. The ionic and electronic conductivities (σion, σelec) are extracted from the impedance spectra using an equivalent circuit based on the premise of mixed conduction. In the temperature range 500-700 °C, a change in local p O2 mainly affects σelec, suggesting that the samples are ionically compensated, i.e., [VO ] = [V Pb ″]. The chemical diffusion coefficient, D̃, is obtained by a conductivity relaxation technique assuming two-dimensional diffusion geometry. In comparison to BaTiO3, or SrTiO3, the chemical diffusivity is found to be relatively high, D̃ =2.0× 10-4 cm2 s-1 (700 °C, in air).
AB - Impedance spectroscopy is performed on a buried capacitor structure composed of a PZT-0.75% Nb ceramic with platinum electrodes. The ionic and electronic conductivities (σion, σelec) are extracted from the impedance spectra using an equivalent circuit based on the premise of mixed conduction. In the temperature range 500-700 °C, a change in local p O2 mainly affects σelec, suggesting that the samples are ionically compensated, i.e., [VO ] = [V Pb ″]. The chemical diffusion coefficient, D̃, is obtained by a conductivity relaxation technique assuming two-dimensional diffusion geometry. In comparison to BaTiO3, or SrTiO3, the chemical diffusivity is found to be relatively high, D̃ =2.0× 10-4 cm2 s-1 (700 °C, in air).
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U2 - 10.1063/1.3302452
DO - 10.1063/1.3302452
M3 - Article
AN - SCOPUS:76449092567
SN - 0003-6951
VL - 96
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 5
M1 - 052906
ER -