ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The Nb and Co doped barium titanate was synthesized by sol-gel auto-ignition synthesisprocess (abbreviated SAS) and compared with the doped powder of the same composition prepared byconventional ball milling process. The phase structure, morphology of the two as-obtained powders andcorrelative dielectric properties of sintered BaTiO3-based ceramics were measured. The XRD analysisdemonstrated that the SAS powder was the Ba(M0.047Ti0.953)O3(M=Nb, Co) solid solution based onBaTiO3; it further suggested that Nb and Co cations could replace the Ti ions and reach reciprocal balanceof acceptors and donors during the decomposition step of the organic fuel by igniting the dried gel. TEMobservation showed that the Ba(M0.047Ti0.953)O3(M=Nb, Co) particles were spherical with the size rangedfrom 30 to 110nm. Furthermore, it was found that the value of the Curie temperature of both the dopedpowders was being lowered in comparison with pure BaTiO3 (Tc≈128ºC ); and the dielectric constant atroom temperature of the SAS powder was 5840, which was much higher than that of the conventional ballmilling doped powder(3013). It was attributed to the maximum homogeneous distribution of dopants inBa-Ti initial solution at atomic level via the SAS process
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.91.pdf
