Dielectric Permittivity of Artificial Crystals Based on Opal Matrices with ZnO Particles in the Millimeter Waveband

AbstractColloidal chemistry techniques were used to synthesize ZnO particles in the nanometer size regime. The particle aging kinetics were determined by monitoring the optical band edge absorption and using the effective mass model to approximate the particle size as a function of time. We show that the growth kinetics of the ZnO particles follow the Lifshitz, Slyozov, Wagner theory for Ostwald ripening. In this model, the higher curvature and hence chemical potential of smaller particles provides a driving force for dissolution. The larger particles continue to grow by diffusion limited transport of species dissolved in solution. Thin films were fabricated by constant current electrophoretic deposition (EPD) of the ZnO quantum particles from these colloidal suspensions. All the films exhibited a blue shift relative to the characteristic green emission associated with bulk ZnO. The optical characteristics of the particles in the colloidal suspensions were found to translate to the films.

Download Full-text

Dielectric Permittivity of Heterogeneous Disperse Systems

Telecommunications and Radio Engineering ◽

10.1615/telecomradeng.v53.i7-8.330 ◽

1999 ◽

Vol 53 (7-8) ◽

pp. 200-203 ◽

Cited By ~ 3

Author(s):

S. V. Gatash ◽

L. D. Styopin

Keyword(s):

Dielectric Permittivity ◽

Disperse Systems

Download Full-text

SOLID-STATE COHERENT PULSE RADAR IN MILLIMETER WAVEBAND FOR DETECTION OF LOW-PROFILE SURFACE VESSELS

Telecommunications and Radio Engineering ◽

10.1615/telecomradeng.v73.i8.50 ◽

2014 ◽

Vol 73 (8) ◽

pp. 705-717

Author(s):

G. I. Khlopov ◽

A. V. Zorenko ◽

A. L Teplyuk ◽

C. Plueschke ◽

J. Wolff ◽

...

Keyword(s):

Solid State ◽

Millimeter Waveband ◽

Pulse Radar ◽

Low Profile ◽

Surface Vessels ◽

Coherent Pulse

Download Full-text

Simulation of a One-Dimensional Magnetophotonic Crystal in the Millimeter Waveband

Telecommunications and Radio Engineering ◽

10.1615/telecomradeng.v66.i19.50 ◽

2007 ◽

Vol 66 (19) ◽

pp. 1757-1768

Author(s):

S. V. Chernovtsev ◽

S. I. Tarapov

Keyword(s):

One Dimensional ◽

Millimeter Waveband ◽

Magnetophotonic Crystal

Download Full-text

The Determination of the Magnetoelectric Coupling Coefficient in Ferroelectric–Ferromagnetic Composite Based on PZT–Ferrite

Archives of Metallurgy and Materials ◽

10.2478/amm-2013-0183 ◽

2013 ◽

Vol 58 (4) ◽

pp. 1401-1403 ◽

Cited By ~ 3

Author(s):

J.A. Bartkowska ◽

R. Zachariasz ◽

D. Bochenek ◽

J. Ilczuk

Keyword(s):

Dielectric Permittivity ◽

Coupling Coefficient ◽

Mean Field ◽

Field Approximation ◽

Theoretical Description ◽

Magnetoelectric Coupling ◽

Mean Field Approximation ◽

Dielectric Measurements ◽

Temperature Dependences ◽

Multiferroic Composite

Abstract In the present work, the magnetoelectric coupling coefficient, from the temperature dependences of the dielectric permittivity for the multiferroic composite was determined. The research material was ferroelectric-ferromagnetic composite on the based PZT and ferrite. We investigated the temperature dependences of the dielectric permittivity (") for the different frequency of measurement’s field. From the dielectric measurements we determined the temperature of phase transition from ferroelectric to paraelectric phase. For the theoretical description of the temperature dependence of the dielectric constant, the Hamiltonian of Alcantara, Gehring and Janssen was used. To investigate the dielectric properties of the multiferroic composite this Hamiltonian was expressed under the mean-field approximation. Based on dielectric measurements and theoretical considerations, the values of the magnetoelectric coupling coefficient were specified.

Download Full-text