Eur. Phys. J. Appl. Phys. 80, 10401 (2017)
https://doi.org/10.1051/epjap/2017170054

Regular Article

Influence of the thermal treatment on structure and dielectric properties of nanostructured BaTiO₃

¹ Voronezh State Technical University, Moskovsky pr. 14, Voronezh 394026, Russia
² Kursk State University, Radishcheva St., 33, Kursk 305000, Russia
³ National University of Trujillo, Juan Pablo II St., 50, Trujillo 130101, Peru

^* e-mail: nikita_emelyanov@bk.ru

Received: 11 February 2017
Received in final form: 6 June 2017
Accepted: 7 August 2017
Published online: 2 October 2017

Abstract

Influence of thermal treatment on the crystalline structure, FTIR spectra and dielectric properties of initially cubic perovskite BaTiO₃ nanoparticles with the average size of 100 nm was studied. It is found that the thermal treatment leads to the formation of ferroelectric tetragonal phase. Experimental results show that an appearance of ferroelectricity in the nanostructured BaTiO₃ and its dielectric permittivity (ε) variation is caused by the decrease of lattice defects concentration owing to thermal annealing. Such defects lead, in particular, to the wide thermal hysteresis of ε observed at cyclic temperature variation in the vicinity of the Curie temperature (T_C) and specific dependence of T_C on d.c. field.