Nonuniform polarized states of ferroelectric nanoparticles in a dielectric matrix

Fourth interdisciplinary scientific forum with international participation "New materials and promising technologies"

Nechaev, V.N.^1 ; Viskovatykh, A.V.^2 ; Shuba, A.V.^1

Mil. Educ. and Scientific Centre of the Air Force N.E. Zhukovsky and Y.A. Gagarin Air Force Academy, Starich Bolshevikov Str, Voronezh

394064, Russia^1

Russian Scientific Center of Roentgenoradiology (RSCRR), Profsoyuznaya Str., Moscow

86, 117997, Russia^2

关键词: Characteristic size;    Dielectric matrixes;    Eigenvalue problem;    Electrostatic equation;    Equilibrium equation;    External electric field;    Phenomenological theory;    Temperature range;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/525/1/012009/pdf
DOI  :  10.1088/1757-899X/525/1/012009

来源: IOP

【 摘 要 】

In the framework of the phenomenological theory of phase transitions (PT) Landau are showed that in nanoscale ferroelectrics (FE), a phase transition to a non-uniform polar state is possible. As a result of solving the eigenvalue problem for the equilibrium equation of polar-ization and electrostatic equations, a wave vector is defined, that characterizes a non-uniform phase in a thin ferroelectric film (FEF), temperature ranges of the domain-like phase are found, depending on the characteristic size of the FE inclusion and its surface properties. The possibility of controlling the domain structure in ferroelectric particles (FEP) using an external electric field is shown.