The effect of water on permittivity properties of nanodielectrics exposed to the atmosphere

Author

Dervos, C.T. ; Mergos, J.A. ; Skafidas, P. ; Athanassopoulou, M.D. ; Vassiliou, P.

Author_Institution

Sch. of Electr. & Comput. Eng., Nat. Tech. Univ. of Athens, Athens

fYear

2008

fDate

June 30 2008-July 3 2008

Firstpage

1

Lastpage

4

Abstract

Relative dielectric constant and dissipation factor (tandelta) values as a function of frequency have been measured for a variety of water types. The effect of water absorption on the permittivity properties of crystalline powders or nanopowders when exposed to various humidity levels is also examined. Powdered materials were characterized by XRD and were calcite (CaCO₃), anatase, rutile (TiO₂), gamma and delta alumina (Al₂O₃). The change induced in the polarization of the powders by the applied dehydration procedures, i.e. high vacuum 10^-6 mbar and calcination at temperatures up to 500degC, was investigated.

Keywords

X-ray diffraction; aluminium compounds; calcium compounds; dielectric losses; dielectric materials; nanoparticles; permittivity; powders; titanium compounds; Al₂O₃; CaCO₃; TiO₂; XRD; calcination; crystalline powders; dissipation factor; nanodielectrics; nanopowders; permittivity; relative dielectric constant; temperature 500 degC; water absorption effect; Atmosphere; Atmospheric measurements; Crystallization; Dielectric constant; Dielectric measurements; Electromagnetic wave absorption; Frequency measurement; Permittivity measurement; Powders; Water;

fLanguage

English

Publisher

ieee

Conference_Titel

Dielectric Liquids, 2008. ICDL 2008. IEEE International Conference on

Conference_Location

Futuroscope-Chasseneuil

Print_ISBN

978-1-4244-1585-4

Electronic_ISBN

978-1-4244-1586-1

Type

conf

DOI

10.1109/ICDL.2008.4622504

Filename

4622504