Temperature dependence anomalous dielectric relaxation in Co doped ZnO nanoparticles

Dielectric Properties and Impedance Spectroscopy of MnCO3‐Modified (Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 Lead‐Free Ceramics

“…It indicates a thermally activated dielectric relaxation process and a possible release of the space charge in the materials. To evaluate the activation energy of the relaxation processes inside the grains, the relaxation frequency associated with these peaks follows the Arrhenius law in the temperature range and the expression can be described,where f max is the peak frequency, f 0 is the preexponential term, E a is the relaxation activation energy, and k is the Boltzmann constant. A plot of ln f max vs 1000/ T is shown in Fig.…”

Investigations on electrical conductivity and dielectric properties of Na doped ZnO synthesized from sol gel method

“…Conductivity in alkali modified zinc oxide is generally attributed to the transport of alkali cations and is called ionic [13]. But in the presence of transition metal ions, we speak about electronic conductivity which is governed by the following mechanism [14][15][16]: during doping, defects are created in the band gap and are filling some energy level [17]. Around these levels, the charge carriers are localized and creating a small polaron [18][19][20].…”

Absorption of electromagnetic waves in sandstone saturated with brine and nanofluids for application in enhanced oil recovery

“…Whereas, the complex quantities ε and μ defines the loss factor and influences the energy absorption and attenuation. Another critical parameter for dielectric properties of the material is the tangent of loss angle (tanδ ε = ε /ε ) and (tanδ μ = μ /μ ), it contributes to the electromagnetic loss in heterogeneous media [49,50]. The measurement of frequency dependences of the real and complex relative permittivity of porous rocks saturated with brine and nanofluid is helpful for the petrophysical analysis of rocks for EOR.…”