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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/12774

Title: High Q Microwave Dielectric Ceramics in (Ni(1-x) Zn(x))Nb(2)O(6) System
Authors: BUTEE, S
KULKARNI, A
PRAKASH, O
AIYAR, RPRC
GEORGE, S
SEBASTIAN, M
Keywords: (zn1-xmgx)nb2o6 ceramics
znnb2o6 ceramics
grain-size
temperature
microstructure
columbite
resonator
zn
additions
disorder
Issue Date: 2009
Publisher: WILEY-BLACKWELL PUBLISHING, INC
Citation: JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 92(5), 1047-1053
Abstract: (Ni(1-x)Zn(x))Nb(2)O(6), 0 <= x <= 1.0, ceramics with >97% density were prepared by a conventional solid-state reaction, followed by sintering at 1200 degrees-1300 degrees C ( depending on the value of x). The XRD patterns of the sintered samples (0 <= x <= 1.0) revealed single-phase formation with a columbite (Pbcn) structure. The unit cell volume slightly increased with increasing Zn content (x). All the compositions showed high electrical resistivity (rho(dc) = 1.6 +/- 0.3 x 10(11) Omega.cm). The microwave (4-5 GHz) dielectric properties of (Ni(1-x)Zn(x))Nb(2)O(6) ceramics exhibited a significant dependence on the Zn content and to some extent on the morphology of the grains. As x was increased from 0 to 1, the average grain size monotonically increased from 7.6 to 21.2 mu m and the microwave dielectric constant (epsilon(r)') increased from 23.6 to 26.1, while the quality factors (Q(u) X f) increased from 18 900 to 103 730 GHz and the temperature coefficient of resonant frequency (tau(f)) increased from -62 to -73 ppm/degrees C. In the present work, we report the highest observed values of Q(u) X f = 103 730 GHz, and epsilon(r)' = 26.1 for the ZnNb(2)O(6)-sintered ceramics.
URI: http://dx.doi.org/10.1111/j.1551-2916.2009.02955.x
http://dspace.library.iitb.ac.in/xmlui/handle/10054/12774
http://hdl.handle.net/10054/12774
ISSN: 0002-7820
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