1. Cluster polarization of Cd[sub 2]Nb[sub 2]O[sub 7] compound.
- Author
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Ang, Chen, Chen Ang, Cross, L. E., Cross, L.E., Guo, Ruyan, Bhalla, A. S., and Bhalla, A.S.
- Subjects
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DIELECTRICS , *DIRECT currents , *ELECTRIC fields - Abstract
The direct-current (dc) electric-field dependence of dielectric constant around paraelectric-ferroelectric transition in Cd[sub 2]Nb[sub 2]O[sub 7] has been studied. The results show significant suppression of the dielectric constant by the application of dc bias. The electric-field dependence of the dielectric constant at the temperature around paraelectric-ferroelectric phase transition can be well described by the modified Devenshire relation including a cluster term, i.e., ε(E)=ε[sub 1]-ε[sub 2]E[sup 2]+ε[sub 3]E[sup 4]+(Px/ε[sub 0])[cosh(Ex)][sup -2]. The fit parameters indicate that the polar-cluster carries polarization P=∼0.5-2.5 mC/m[sup 2] with the cluster size of L=∼11-15 nm. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]
- Published
- 2000