A theoretical study was carried out to determine the dielectric response and tunability of a composite consisting of a linear, low-loss dielectric matrix with uniformly sized, randomly distributed paraelectric (BST 60/40) particles as functions of the volume fraction and size of the particles. The field dependence of the polarization and the dielectric response of the inclusions are specified through a nonlinear thermodynamic model and then incorporated into a two-dimensional finite element analysis. Near the percolation threshold for BST particles ( to 45% depending on the particle size), high dielectric tunabilities with a lower effective permittivity than monolithic BST can be realized.
Dielectric response and tunability of a dielectric-paraelectric composite
K. Zhou, S. A. Boggs, R. Ramprasad, M. Aindow, C. Erkey, S. P. Alpay; Dielectric response and tunability of a dielectric-paraelectric composite. Appl. Phys. Lett. 8 September 2008; 93 (10): 102908. https://doi.org/10.1063/1.2982086
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