Influence of TiO2 Crystalline Structure on Dielectric Resonator Properties from ZnO-Nb2O5-TiO2 Ceramic System for Use in Telecommunications

Maria do Carmo Andrade Nono; Pedro José Castro; Elizete G.L. Rangel; Sergio Luiz Mineiro

doi:10.4028/www.scientific.net/MSF.775-776.391

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HomeMaterials Science ForumMaterials Science Forum Vols. 775-776Influence of TiO2 Crystalline Structure on...

Influence of TiO₂ Crystalline Structure on Dielectric Resonator Properties from ZnO-Nb₂O₅-TiO₂ Ceramic System for Use in Telecommunications

Abstract:

This paper presents an investigation of the correlation between dielectric properties and microstructure and TiO2 crystalline-phase characteristics (rutile and anatase) in ZnO-TiO2-Nb2O5 system ceramics. Such ceramics were produced from powder mixtures of zinc oxide, niobium oxide and titanium oxide. Powder mixtures were compressed by pressing (100 MPa uniaxial and 300 MPa isostatic) and sintered at 1100, 1200 and 1250 °C. The sintered ceramics were characterized on the crystalline phases, density and microstructure and microwave frequencies. As for the microwave dielectric properties, dielectric constant, quality factor and thermal coefficient in the temperature range from-20 to 50 °C were measured. The results showed that the type of titanium oxide structure (rutile or anatase) causes influence on the type and quantity of crystalline phases in relative density of sintered ceramics and, consequently in their dielectric properties measurements.

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Materials Science Forum (Volumes 775-776)

Pages:

391-396

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.775-776.391

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Online since:

January 2014

Authors:

Maria do Carmo Andrade Nono, Pedro José Castro, Elizete G.L. Rangel, Sergio Luiz Mineiro

Keywords:

Anatase, Dielectric Resonators, Microwave Dielectric Properties, Rutile

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References

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