Relaxor features in ferroelectric superlattices: A Maxwell–Wagner approach
2000; American Institute of Physics; Volume: 77; Issue: 19 Linguagem: Inglês
10.1063/1.1324729
ISSN1520-8842
AutoresGustau Catalán, D. O’Neill, R. M. Bowman, J. M. Gregg,
Tópico(s)Acoustic Wave Resonator Technologies
ResumoA Maxwell–Wagner series capacitor model is proposed to explain anomalous dielectric properties of ferroelectric superlattices. The results of the model show that a superlattice consisting of normal ferroelectric layers separated by low-resistivity interfacial regions can account for most experimental results reported to date, namely: dielectric enhancement for certain stacking periodicities, giant permittivities, and temperature migration of dielectric maxima as a function of frequency. The predictions of the model are discussed and compared to our own experimental results from thin film superlattice capacitors made by pulsed-laser deposition.
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