The dielectric constants of axially isotropic composite materials

摘要: An exact expression is obtained for the principal dielectric constants of a macroscopically homogeneous and axially isotropic two-phase composite material. This compared with result in case. Upper lower bounds are given. They shown to be attainable found depend upon direction applied field. Approximate power-law formulae derived their applicability discussed terms internal geometry sample. It suggested that these approximate may usefully polymer-polymer mixtures. further except Looyenga third-power formula they not applicable samples.