We report on measurements of impedance of Au/PZT/La0.67Sr0.33MnO3/Pt80Ir20 thin film capacitors performed in the time domain. Ferroelectric PZT films pulsed laser deposited on bulk polycrystalline Pt80Ir20 substrates demonstrate good ferroelectric properties: dielectric permittivity ε’ = 880 and loss tanδ = 0.039 at 1 kHz, remnant polarization as high as 20 μC/cm2, induced polarization of 40 μC/cm2 at 380 kV/cm, and coercive field of 52.5 kV/cm. Resistivity of PZT film at coercive field was found to be 3.1012 Ω.cm. Instantaneous C-V andI-V characteristics have been recorded to study the relaxation of polarization. Transient current exhibits non-Debye type relaxation, which has been nicely fitted to Curie-von Schweindler law j = jleak + j0 (t/1 sec)−n with an exponent n ∼ 0.8 while the power law C ∞ f− -0.1 has been found in frequency dispersion of the capacitance. Impedance fluctuation spectrum in the “true leakage” and resistance degradation regimes was found to follow 1/f 1.5 dependence. Close to breakdown field voltage fluctuations in ferroelectric capacitor increase, become non-steady randomly spike-shaped.
No takes yet. Share an insight, caveat, or question.
Lisauskas et al. (2001) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: