Effect of porosity on the electrical properties of Y2O3-doped SrTiO3 internal boundary layer capacitors

Abstract

Articles you may be interested inLow dielectric loss, dielectric response, and conduction behavior in Na-doped Y2/3Cu3Ti4O12 ceramics The sintering temperature effects on the electrical and dielectric properties of Li 0.05 Ti 0.02 Ni 0.93 O ceramics prepared by a direct thermal decomposition method Compositions of 0.8 mole % Y 2 O 3 -doped SrTiO 3 were sintered over a range of temperatures of 1450-1550°C for times of 1-15 h, and the resulting internal boundary layer capacitors had relative densities ranging from 92% to 98%. The effective dielectric constant and effective conductivity were highly correlated with each other, and both electrical properties decreased strongly with increasing porosity. To account for the effect of porosity on the two electrical properties, a scaling law model was developed, which takes into account the grain size, the thickness of the grain boundary region, the pore size, and the pore aspect ratio. The model predicts a strong decrease in effective dielectric constant and effective conductivity with porosity for internal boundary layer capacitors, which is in accord with the observed trends.

Effect of γ-Irradiation on the Dielectric and Conductivity Properties of Nano-Wollastonite

“…However, the effect of porosity on the dielectric conductivity needs further investigation. In semiconducting SrTiO 3 doped with Y 2 O 3 , it is reported that increase in porosity has resulted in decrease in conductivity [19]. However, in polycrystalline NaNbO 3 ceramic, porous counterpart is known to exhibit higher bulk conductivity than dense ones [20].…”

Effect of UV irradiation on the densification behavior, microstructure, and microwave dielectric properties of low temperature sintering Al2O3 ceramics

“…One is the grain size and its uniformity. Many investigations show that larger grain size and higher uniformity are helpful to the increasing of Q × f value [ [17] , [18] , [19] , [20] , [21] ]. Another is the impure phase.…”

Study on the Microstructure, Corrosion Resistance and Dielectric Properties of Atmospheric Plasma-Sprayed Y2O3 Ceramic Coatings

“…The primary factor affecting grain size was identified as the melting behavior of the Y 2 O 3 powder particles. The better the melting effect, the smaller the porosity of the coating, and some studies have found that there was a high correlation between the effective permittivity and the effective conductivity, and, with the increase in porosity, both the dielectric constant and the effective conductivity decreased strongly [20]. According to the Scherrer equation, the grain size (d) and grain size of the coating were calculated [21,22] as follows:…”