Title :
Dielectric Properties of Fine Grains Barium Titanate Ceramics Prepared by Mechanochemical Synthesis
Author :
Miclea, C. ; Tanasoiu, C. ; Spanulescu, I. ; Miclea, C.F. ; Gheorghiu, A. ; Amarande, L. ; Cioangher, M.
Author_Institution :
National Inst. for Mater. Phys., Bucharest-Magurele
Abstract :
Barium titanate was prepared by the advanced procedure of mechanochemical synthesis from barium and titanium oxides after 50 hours of milling. The X-ray examination of the milled powders showed the phase evolution during synthesis and the perovskite phase was initiated after 5 hours and was completed after 50 hours. Sintered samples from these nanopowders show different dielectric properties for fine and coarse grained ceramics. Samples with an average grain size of 2 mum showed the highest dielectric constant of 5800 at room temperature. A sharp maximum of the dielectric constant with values of about 16000 was recorded at the Curie temperature
Keywords :
Curie temperature; barium compounds; ceramics; dielectric materials; grain size; milling; nanoparticles; permittivity; sintering; 2 micron; 5 hrs; 50 hrs; Curie temperature; X-ray examination; barium titanate; coarse grained ceramics; dielectric constant; dielectric properties; fine grained ceramics; mechanochemical synthesis; milled powders; nanopowders; perovskite phase; phase evolution; sintered samples; Barium; Ceramics; Dielectrics; Grain size; Mechanical factors; Milling; Nanoparticles; Powders; Temperature; Titanium compounds;
Conference_Titel :
International Semiconductor Conference, 2006
Conference_Location :
Sinaia
Print_ISBN :
1-4244-0109-7
DOI :
10.1109/SMICND.2006.283986
