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Processing, dielectric behavior and conductivity of some complex tungsten-bronze dielectric ceramics
Sukhleen Bindra Narang,Dalveer Kaur,Kulwant S. Thind 한양대학교 세라믹연구소 2006 Journal of Ceramic Processing Research Vol.7 No.1
Ceramic samples of a complex structural formula Ba6-3xR8+2xTi18O54, where R is a rare-earth oxide and R=Sm, Nd and Gd and x=0.2-0.7 were prepared by a high temperature solid-state reaction technique. The dielectric properties (i.e. dielectric constant (ε'), dielectric loss (ε'') and Q-factor) have been measured on the sintered disks with respect to the frequency in the range 0.3 GHz-3.0 GHz at room temperature. The dielectric properties of the synthesized samples have been found out to be a function of the wt.% of rare-earth oxides used. Dielectric conductivity (σ) was derived from the dielectric constant and loss tangent data in the same frequency range. Conductivity calculations were carried out based on this derived formula. The capacitance values have been calculated knowing the geometrical dimensions of the samples synthesized.
Sukhleen Bindra Narang,I.S. Hudiara 한양대학교 세라믹연구소 2006 Journal of Ceramic Processing Research Vol.7 No.2
Suitable ferrite components are designed for use in systems like radar, satellite uplinks, industrial heaters or dryers and nuclear systems which employ high power microwaves. Ferrites are also used as microwave absorbers. Radar absorbing paint made from ferrites can be used to coat military aircraft for stealth operation. In this study, some hexaferrites have been synthesized and characterized for their possible use at high frequencies. Three series of M type hexagonal ferrites having the general formula MeFe12O19 in which Me was Ba2+, Sr2+ or Ca2+ and Fe3+ ions were replaced partly by Co2+Ti4+ ions were chosen for synthesis and study. The microwave dielectric constants of these hexaferrites has been measured in the X band of the microwave frequency range after successively increasing the amount of substituted ions in the ferrites. The variation of Complex Permittivity of these hexaferrites with change in composition as well as change in frequency has been measured in this frequency range. Important inferences have been drawn using theoretical concepts.