Ferroelectric behavior of a lead titanate nanosphere due to depolarization fields and mechanical stresses

Abstract:

A theorical model has been developed based on the theory of Ginzburg-Landau-Devonshireto study and pbkp_redict the effects the decreasing of size particle in a nanosphere of PbTiO3subjected to the action of depolarization fields and mechanical stress. It was consideredthat the nanosphere is surrounded by a layer of space charges on its surface, and contai-ning 180?domains generated by minimizing free energy of depolarization. Energy density ofdepolarization, wall domain and electro-elastic energy have been incorporated into the freeenergy of the theory Ginzburg-Landau-Devonshire. Free energy minimization was perfor-med to determine the spontaneous polarization and transition temperature system. Theseresults show that the transition temperature for nanosphere is substantially smaller than the corresponding bulk material. Also, it has been obtained that the stability of the ferroelec-tric phase of nanosphere is favored for configurations with a large number of 180? domains, with the decreasing of thickness space charge layer, and the application of tensile stress and decreases with compressive stress.

Año de publicación:

2017

Keywords:

Fuente:

scopus