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Role of Ni and Zr doping on the electrical, optical, magnetic, and structural properties of barium zinc tantalate ceramics

Published online by Cambridge University Press:  31 January 2011

G. Rong ,
N. Newman ,
B. Shaw  and
D. Cronin
G. Rong
Affiliation:
Electrical and Computer Engineering Department, Northwestern University, Evanston, Illinois 60208
N. Newman
Affiliation:
Electrical and Computer Engineering Department, Northwestern University, Evanston, Illinois 60208
B. Shaw
Affiliation:
Electrical and Computer Engineering Department, Northwestern University, Evanston, Illinois 60208
D. Cronin
Affiliation:
Trans-Tech Inc., Adamstown, MD 21710
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Abstract

Properties of Ni- and Zr-doped Ba(Zn1/3Ta2/3)O3 ceramics are reported. The nickel ion has an effective paramagnetic moment of 3.22 ± 0.05. Optical spectra of Ni-doped Ba(Zn1/3Ta2/3)O3 are dominated by discrete internal transitions between Ni2+ 3d orbitals. Absorption from the 3Γ2(F) ground state to 4Γ3(F), 3Γ1(D), 5Γ1(D), 4Γ3(P) excited states occurs at approximately 1.55, 1.75, 2.50, and 2.80 eV, respectively. The ligand field strength of neighboring oxygen ions ranges from about 7300 cm−1 (0.25% Ni) to about 7700 cm−1 (1.0% Ni). A significant increase in the visible continuum background is correlated with increased tan δ. This effect is attributed to point defects in the Ni environment, suggesting that point defects play an important role in microwave loss in practical dielectric material.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 10 , October 1999 , pp. 4011 - 4019
Copyright
Copyright © Materials Research Society 1999

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