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.
REFERENCES
1.
O. G.
Vendik
, E. K.
Hollmann
, A. B.
Kozyrev
, and A. M.
Prudan
, J. Supercond.
12
, 325
(1999
).2.
A. K.
Tagantsev
, V. O.
Sherman
, K. F.
Astafiev
, J.
Venkatesh
, and N.
Setter
, J. Electroceram.
11
, 5
(2003
).3.
P.
Bao
, T. J.
Jackson
, X.
Wang
, and M. J.
Lancester
, J. Phys. D
41
, 063001
(2008
).4.
See, e.g.,
S.
Zhong
, S. P.
Alpay
, M. W.
Cole
, E.
Ngo
, S.
Hirsch
, and J. D.
Demaree
, Appl. Phys. Lett.
90
, 092901
(2007
);W.
Fu
, H.
Wang
, L.
Cao
, and Y.
Zhou
, Appl. Phys. Lett.
92
, 182910
(2008
).5.
K. W.
Yu
, P. M.
Hui
, and D.
Stroud
, Phys. Rev. B
47
, 14150
(1993
);T. C.
Choy
, Effective Medium Theory: Principles and Applications
(Oxford University Press
, Oxford
, 1999
).6.
K. F.
Astafiev
, V. O.
Sherman
, A. K.
Tagantsev
, and N.
Setter
, J. Eur. Ceram. Soc.
23
, 2381
(2003
).7.
V. O.
Sherman
, A. K.
Tagantsev
, and N.
Setter
, J. Appl. Phys.
99
, 074104
(2006
).8.
N. A.
Pertsev
, A. G.
Zembilgotov
, and A. K.
Tagantsev
, Phys. Rev. Lett.
80
, 1988
(1998
);N. A.
Pertsev
, A. K.
Tagantsev
, and N.
Setter
, Phys. Rev. B
61
, R825
(2000
).9.
Y. L.
Li
, S.
Choudhury
, J. H.
Haeni
, M. D.
Biegalski
, A.
Vasudevarao
, A.
Sharan
, H. Z.
Ma
, J.
Levy
, V.
Gopalan
, S.
Trolier-McKinstry
, D. G.
Schlom
, Q. X.
Jia
, and L. Q.
Chen
, Phys. Rev. B
73
, 184112
(2006
).10.
M.
Rottereau
, J. C.
Gimela
, T.
Nicolai
, and D.
Durand
, Eur. Phys. J. E
11
, 61
(2003
).11.
L.
An
, S. A.
Boggs
, and J. P.
Calame
, Proceedings of the 2008 IEEE Power Modulator Conference
(unpublished).12.
13.
O. G.
Vendik
and S. P.
Zubko
, J. Appl. Phys.
82
, 4475
(1997
).14.
N.
Shi
and R.
Ramprasad
, Phys. Rev. B
74
, 045318
(2006
).© 2008 American Institute of Physics.
2008
American Institute of Physics
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