Title :
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
fDate :
June 30 2008-July 3 2008
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;
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
DOI :
10.1109/ICDL.2008.4622504
