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26 May 2003

Volume 82, Issue 21, pp. 3587-3793

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Appl. Phys. Lett. 82, 3716 (2003); http://dx.doi.org/10.1063/1.1577808 (3 pages)

V. Novosad, M. Grimsditch, J. Darrouzet, J. Pearson, S. D. Bader, V. Metlushko, K. Guslienko, Y. Otani, H. Shima, and K. Fukamichi
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Dielectric properties of Bi2O3–ZnO–Ta2O5 pyrochlore and zirconolite structure ceramics

Chen Ang, Zhi Yu, H. J. Youn, C. A. Randall, A. S. Bhalla, L. E. Cross, and M. Lanagan

Appl. Phys. Lett. 82, 3734 (2003); http://dx.doi.org/10.1063/1.1575933 (3 pages) | Cited 11 times

Online Publication Date: 20 May 2003

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This letter reports the dielectric properties of the cubic pyrochlore (Bi3/4Zn1/4)2(Zn1/4Ta3/4)2O7, monoclinic zirconolite Bi2(Zn1/3Ta2/3)2O7, and their composites in the temperature range of 10–400 K from 102 to ∼ 1010 Hz. Composites with a near zero temperature coefficient of capacitance (TCC) consisting of the cubic pyrochlore and monoclinic zirconolite phases have been obtained. The observed microwave dielectric properties (ϵ=∼60, Q=∼325, and TCC=∼30 ppm/K at ∼5.1 GHz) as well as their low sintering temperatures (950–1100 °C) show that the compounds are promising materials for recently developed microwave devices, which demand that dielectric ceramics can be cofired with silver electrodes. © 2003 American Institute of Physics.
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77.80.-e Ferroelectricity and antiferroelectricity
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.22.Ch Permittivity (dielectric function)
77.22.Gm Dielectric loss and relaxation
81.20.Ev Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
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