A Viable Route for Dense TiO2with a Low Microwave Dielectric Loss

Autor:	Henk Verweij, Kubilay Sertel, Krenar Shqau, John L. Volakis, Lanlin Zhang, Gokhan Mumcu
Rok vydání:	2010
Předmět:	Materials science Flexural strength Agglomerate Materials Chemistry Ceramics and Composites Sintering Dielectric loss Dielectric Composite material Microstructure Microwave Grain size
Zdroj:	Journal of the American Ceramic Society. 93:969-972
ISSN:	1551-2916 0002-7820
Popis:	Dense, high-purity TiO2 was prepared from commercially available powders. These powders were deagglomerated, colloidally stabilized in aqueous NH3, followed by screening to remove residual agglomerates. Homogeneous compacts were formed using colloidal-filtration followed by sintering. TiO2 with >99.5% density and 400 MPa flexural strength was obtained at a sintering temperature as low as 1000°C. The dielectric loss of this TiO2 was 1.4 × 10−4 at 6.4 GHz at room temperature. This implied that the product of the quality factor and frequency, (Q×f )=f/tan δ, was 46 000 GHz, ∼7.6 times higher than 6000 GHz (Q
Databáze:	OpenAIRE
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