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Evidence of Kittel type behaviour of the permittivity of a nanostructured high sensitivity piezoelectric

AuthorsBalciunas, Sergejus; Ivanov, Maksim; Grigalaitis, Robertas; Banys, Juras; Amorín, Harvey; Castro, Alicia; Algueró, Miguel
Dielectric properties
Issue Date2018
PublisherAmerican Institute of Physics
CitationJournal of Applied Physics 123 (2018)
AbstractThe broadband dielectric properties of high sensitivity piezoelectric 0.36BiScO-0.64PbTiO ceramics with average grain sizes from 1.6 μm down to 26 nm were investigated in the 100-500 K temperature range. The grain size dependence of the dielectric permittivity was analysed within the effective medium approximation. It was found that the generalised core-shell (or brick wall) model correctly explains the size dependence down to the nanoscale. For the first time, the grain bulk and boundary properties were obtained without making any assumptions of values of the parameters or simplifications. Two contributions to dielectric permittivity of the grain bulk are described. The first is the size-independent one, which follows the Curie-Weiss law. The second one is shown to plausibly follow the Kittel's law. This seems to suggest the unexpected persistence of mobile ferroelectric domains at the nanoscale (26 nm grains). Alternative explanations are discussed.
Publisher version (URL)https://doi.org/10.1063/1.5006011
Identifiersdoi: 10.1063/1.5006011
issn: 1089-7550
e-issn: 1089-7550
Appears in Collections:(ICMM) Artículos
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