期刊
JOURNAL OF APPLIED PHYSICS
卷 90, 期 5, 页码 2465-2468出版社
AMER INST PHYSICS
DOI: 10.1063/1.1388856
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The effect of dc bias on dielectric properties of cadmium pyroniobate Cd2Nb2O7 ceramics is studied in this article. Without dc bias, two obvious dielectric peaks around 80 and 180 K are observed; by applying dc bias, the two peaks are greatly suppressed and finally eliminated at 15 kV/cm, however, a peak with no frequency dispersion shows up at 192 K. The results show high electric-field tunability of the dielectric constant with a low dielectric loss at radio frequencies. The electric-field dependence of the dielectric constant around 80 K can be well described by the modified Devonshire relation including the Langevin-type cluster term, i.e., epsilon (E)=epsilon (1)-epsilon E-2(2)+epsilon E-3(4)+(P(j)x(j)/epsilon (0))[cosh(Ex(j))](-2). The fit parameters indicate that the polar cluster carries polarization P=similar to0.28-0.65 mC/m(2) with the cluster size of L=similar to 24-30 nm. (C) 2001 American Institute of Physics.
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