Dielectric Properties of Polymer/Ferroelectric Ceramic Composites from 100 Hz to 10 GHz

Abstract

Dielectric properties of model BaTiO3/polymer composites were measured over a broad frequency and temperature range. A series of BaTiO3/monomer suspensions were photocured into thin wafers. The wafers were equipped with aluminum electrodes, and the dielectric permittivity of the composites was investigated at frequencies from 100 Hz to 10 GHz and at temperatures from -140 to +150 °C. It has been found that for the same BaTiO3 loading dielectric characteristics of the composites strongly depend of the type of polymer. Polar polymers increase dielectric constant of the composites at low frequencies but have little effect at gigahertz frequencies. Dielectric losses of the composites show a maximum at some intermediate frequency within megahertz to gigahertz range that reflects the relaxation behavior of the polymer matrix. The magnitude of the losses increases with increasing polarity of the polymer component. At constant frequency and temperature, the composites follow a linear relationship between logarithm of their dielectric constant and volume fraction of the ferroelectric filler. Practical implications of such composites behavior are discussed.

Effect of high aspect ratio filler on dielectric properties of polymer composites: a study on barium titanate fibers and graphene platelets

“…The loss factor of all the tested composites is below 0.006, only an order of magnitude higher than that of the neat polymer. In the literature, 20 vol% of BaTiO 3 particles usually double the dielectric constant of pure polymer, which is similar to the effect of the lowest aspect ratio fiber in this work [4,5,20,21].…”

Barium titanate/polyester resin nanocomposites: Development, structure-properties relationship and energy storage capability

“…Barium titanate's great significance is expressed in its applications, which include ceramic capacitors, PTCR thermistors (positive temperature coefficient resistors/thermistors or posistors), piezoelectric sensors, optoelectronic devices, transducers, actuators etc. [4][5][6][7][8][9][10]. Furthermore, it is being applied as a capacitive material in dynamic random access memories (DRAM) in integrated circuits.…”

Ac Electrical Properties of Polystyrene/Ferroelectric Barium Stannate Titanate Ba(Ti0.9Sn0.1)O3Ceramic Composite

“…• C indicate that these properties are strongly dependent on the type of polymer for the same BaTiO 3 loading dielectric characteristics of the composites [23]. Furthermore, studying the effects of mixing ferroelectric barium titanate (BaTiO 3 ) with ferromagnetic barium hex ferrite (BaFe 12 O 19 ) showed that the dielectric constant of different concentrations of BaTiO 3 decreases as the frequency increases and the dielectric constant increases with temperature until it reaches the Curie temperature and then tends to decrease [24].…”