Theoretical Investigation of Maximum Field Strength in Porous Silica Dielectric

概要

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The maximum magnitude of electrical field strength ($E_{\text{max}}$) in porous silica dielectrics is derived as a function of porosity in a theoretical approach. The cylindrical air pores assume the Hashin–Shtrikman (HS) structure, two-dimensional periodic square-array, and hexagonal-array structures. In the case of the HS structure, as porosity increases, the electric field strength decreases homogeneously in the silica skeleton; therefore, $E_{\text{max}}$ decreases monotonically with increasing porosity. In the case of a square- or hexagonal-array structure, at low porosity, $E_{\text{max}}$ is approximately equal to that of the HS structure; however, as porosity increases, the electric field strength around the pore surface deviates from the prediction of the HS model, and electric field strength becomes large at local spots; then $E_{\text{max}}$ increases with increasing porosity. In addition similar studies are performed for coated cylindrical air pores.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2008-07-25