Dielectric response and tunability of a dielectric-paraelectric composite

Zhou, K.; Boggs, S. A.; Ramprasad, R.; Aindow, M.; Erkey, C.; Alpay, S. P.
September 2008
Applied Physics Letters;9/8/2008, Vol. 93 Issue 10, p102908
Academic Journal
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 Ba0.60Sr0.40TiO3 (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 (∼27% to 45% depending on the particle size), high dielectric tunabilities with a lower effective permittivity than monolithic BST can be realized.


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