A schematic representation of the square-arrays composite in which the unit cell is made of a coated cylindrical fiber within the matrix. The volume fraction of the inclusion f, is defined as the ratio of the volume of the fiber plus the coating layer over the total volume of the unit cell (fiber plus coating layer plus matrix). The radius ratio of the fiber over the coating shell is defined as γ.
(Color online) The effective ME voltage coefficient α 11 * vs the volume fraction of the inclusion f and the radius ratio γ. The composite is in a square array where coated cylindrical fibers are embedded in the matrix. (a) BTO fiber coated by TD, with both in a CFO matrix. (b) TD fiber coated by BTO, with both in a CFO matrix. (c) BTO fiber coated by CFO, with both in a TD matrix. (d) CFO fiber coated by BTO, with both in a TD matrix.
Material parameters of BaTiO3, CoFe2O4 (Ref. 12), and Terfenol-D (Refs. 43 and 44).
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