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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/100/14162

Title: Significant enhancement in quality factor of Zn(2)TiO(4) with Cu-substitution
Authors: BUTEE, S
KULKARNI, AR
PRAKASH, O
AIYAR, RPRC
WATTAMWAR, I
BAIS, D
SUDHEENDRAN, K
RAJU, KCJ
Keywords: MICROWAVE DIELECTRIC-PROPERTIES
CRYSTAL-STRUCTURE
CERAMICS
TEMPERATURE
MICROSTRUCTURE
TRANSITION
STABILITY
ADDITIONS
ZNO-TIO2
SYSTEM
Issue Date: 2011
Publisher: ELSEVIER SCIENCE BV
Citation: MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS,176(7)567-572
Abstract: Zinc orthotitanate (Zn(1-x)Cu(x))(2)TiO(4), 0 <= x <= 0.20, spinel samples were prepared by solid state reaction and sintering. 1060 degrees C was the optimal sintering temperature for all the Cu-substituted samples which showed sintered density >= 94%, and maximum unloaded quality factor (Q(u)f). SEM microphotographs revealed fairly uniform grains between 2 and 20 mu m depending upon the composition. Microwave measurements at similar to 7.1-7.5 GHz on these samples (as dielectric resonators) showed with Cu-substitution a steep increase in Q(u)f value from 2100 GHz (for Zn(2)TiO(4), x = 0) to 15,200 GHz (for x = 0.10), a significant jump of over 7 times, while epsilon'(r) was similar to 20 (for x = 0) and similar to 18 (x = 0.10). The jump in Q(u)f in Cu-substituted samples was attributed partly to improved sintered density and partly to absence of paramagnetic Ti(3+), as revealed by electron spin resonance spectra at 9.1 GHz. (c) 2011 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.mseb.2011.01.013
http://dspace.library.iitb.ac.in/jspui/handle/100/14162
ISSN: 0921-5107
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