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SEM micrographs of (a) 3D random BST/MgO composite with (b) a zoom of the corresponding chemical contrast image (magnesia is not homogeneously dispersed in the BST matrix, the dark area corresponds to several MgO grains), and (c) sandwich BST/MgO/BST composite and (d) BST sintered by SPS.
Thermal variations of (a) dielectric permittivity and (b) losses at of spark plasma sintered BST, two-dimensional multilayer, and three-dimensional BST/MgO.
Electric field tunability of the permittivity at in three-dimensional BST/MgO ceramic composite. Tunability is defined as , where and are the permittivities under and without an applied electric field, respectively.
Inverse permittivity as a function of temperature at for BST, BST/MgO/BST, and SPS ceramics. Inset: values of the Curie Weiss temperature and the Curie constant obtained from the fit.
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