ZnO-Nb sub(2)O sub(5)-TiO sub( 2) Dielectric Resonators and Porosity Influence on Dielectric Constant Values

The dielectric resonator (DR) is a ceramic component used in electronic circuits that can operate in microwave frequency range, where it plays the role of resonant element and enables the construction of high selective filters and oscillators. The dielectric properties of a ceramic resonator are inf...

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Bibliographic Details
Published inMaterials science forum Vol. 820; pp. 193 - 198
Main Authors Nono, M CA, Castro, Pedro Jose, Rangel, E GL, Mineiro, S L
Format Journal Article
LanguageEnglish
Published 01.06.2015
Subjects
Ceramics
Compacting
Dielectric constant
Materials science
Porosity
Resonators
Sintering
Titanium dioxide
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Summary:The dielectric resonator (DR) is a ceramic component used in electronic circuits that can operate in microwave frequency range, where it plays the role of resonant element and enables the construction of high selective filters and oscillators. The dielectric properties of a ceramic resonator are influenced by their microstructure characteristics as pores amount. This work shows a study of the influence of pores amount (porosity) on the dielectric constant values of ceramics from ZnO-Nb sub(2)O sub(5)-TiO sub(2) system. Mixtures of Nb sub(2)O sub(5), ZnO, and TiO sub(2) powders were compacted by uniaxial (100 MPa) and isostatic (300 MPa) pressing and sintered at 1100, 1200, and 1250[degrees]C. The experimental dielectric constant values of the sintered ceramics were corrected to eliminate the porosity influence. The results showed that the porosity, the type and quantities of crystalline chemical compounds in the ceramics influence the dielectric constant values.
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ISSN:0255-5476
1662-9752
DOI:10.4028/www.scientific.net/MSF.820.193