title: Dielectric investigations and theoretical calculations of size effect in lead titanate nanocrystals.
abstract: The dielectric properties of nanograin ferroelectric lead titanate crystals are presented. The PbTiO3 samples were prepared by pressing nanopowders into plates and were studied experimentally by dielectric permittivity measurements in a wide frequency and temperature range. The TC dependence obtained showed a critical change of behavior with increasing mean nanoparticle size in the 9-nm region. The theoretical calculations based on Monte Carlo simulation were performed to describe the behavior of this material. It was shown that the distribution of nanoparticle sizes in the sample taken into account with the Monte Carlo method describes the dielectric properties of PbTiO3 nanocrystals quite well.
authors.affiliation: Physic Faculty, Vilnius University, Lithuania. Robertas.grigalaitis@ff.vu.lt
authors.forename: Robertas
authors.initials: R
authors.lastname: Grigalaitis
authors.forename: Juras
authors.initials: J
authors.lastname: Banys
authors.forename: Saulius
authors.initials: S
authors.lastname: Lapinskas
authors.forename: Emre
authors.initials: E
authors.lastname: Erdem
authors.forename: Ralf
authors.initials: R
authors.lastname: Böttcher
authors.forename: Hans-Jürgen
authors.initials: HJ
authors.lastname: Gläsel
authors.forename: Eberhard
authors.initials: E
authors.lastname: Hartmann
mesh_terms: D003198:Computer Simulation; D003460:Crystallization; D017097:Electric Impedance; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods*; D004574:Electromagnetic Fields; D007854:Lead / Q000737:chemistry* / Q000528:radiation effects*; D008422:Materials Testing; D008956:Models, Chemical; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects* / Q000648:ultrastructure; D010316:Particle Size; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects*
chemical_list: C481719:lead titanate; D007854:Lead; D014025:Titanium