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RF and microwave dielectric properties of (Zn(0.95)M(0.05))(2)TiO(4) (M = Mn(2+), Co(2+), Ni(2+) or Cu(2+)) ceramics

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Title RF and microwave dielectric properties of (Zn(0.95)M(0.05))(2)TiO(4) (M = Mn(2+), Co(2+), Ni(2+) or Cu(2+)) ceramics
 
Creator BUTEE, S
KULKARNI, AR
PRAKASH, O
AIYAR, RPRC
SUDHEENDRAN, K
JAMES, KCR
 
Subject transition
zn2tio4
microstructure
resonators
stability
spinels
zn
ceramics
oxides
permittivity
electrical measurements
 
Description Here, we report our results on the synthesis and properties of pure and 3d transition metal substituted zinc ortho-titanate (Zn(1-x)M(x))(2)TiO(4) dielectrics. Polycrystalline (Zn(0.95)M(0.05))(2)TiO(4) (M = Mn(2+), Co(2+), Ni(2+) or Cu(2+)) samples of sintered density >= 94%, were prepared by ceramic powder mixing and solid state reaction followed by sintering (in air) between 1060 and 1180 degrees C. The XRD patterns of the furnace cooled samples revealed single ortho-titanate tetragonal inverse spinet phase. The SEM micrographs showed fairly uniform grains between 5 and 25 mu m depending upon the composition. Dielectric measurements on the samples were made at low frequencies (1 kHz to 1 MHz) from 30 to 450 degrees C. The dielectric constant (epsilon(r)') and dielectric loss (tan delta), at all the frequencies, were found to rise with progressive increase in sample's temperature albeit the rise being less at higher frequencies (>= 100 kHz). The room temperature values of epsilon(r)' were between 21 and 26 (depending on the 3d M(2+) ion) and remained almost constant in the entire low frequency range
 
Publisher ELSEVIER SCIENCE BV
 
Date 2011-10-22T18:39:08Z
2011-12-15T09:10:45Z
2011-10-22T18:39:08Z
2011-12-15T09:10:45Z
2010
 
Type Article; Proceedings Paper
 
Identifier MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS,168,151-155
0921-5107
http://dx.doi.org/10.1016/j.mseb.2009.11.007
http://dspace.library.iitb.ac.in/xmlui/handle/10054/14961
http://hdl.handle.net/100/1639
 
Source Conference on Specialty Advanced Materials and Polymers for Aerospace and Defense and Applications (SAMPADA-2008),Pune, INDIA,DEC 08-12, 2008
 
Language English