Doped barium titanate nanoparticles

Abstract

We have synthesized nickel (Ni) and iron (Fe) ion doped BaTiO 3 nanoparticles through a chemical route using polyvinyl alcohol (PVA). The concentration of dopant varies from 0 to 2 mole% in the specimens. The results from X-ray diffractograms and transmission electron micrographs show that the particle diameters in the specimen lie in the range 24-40 nm. It is seen that the dielectric permittivity in doped specimens is enhanced by an order of magnitude compared to undoped barium titanate ceramics. The dielectric permittivity shows maxima at 0⋅3 mole% doping of Fe ion and 0⋅6 mole% of Ni ion. The unusual dielectric behaviour of the specimens is explained in terms of the change in crystalline structure of the specimens.

Effect of Ba doping on magnetic and dielectric properties of nanocrystalline BiFeO3 at room temperature

“…4(a)). This is similar to that of Fe-doped BaTiO 3 nanoparticles reported by Kundu et al [25]. The dielectric constant with a tetragonal structure decreases with decreasing the c/a ratio, which decreases with increasing Ba content from the XRD analysis.…”

Domain morphology controlled crystal habits in PbTiO3 nanocrystals

“…The synthesis of PbTiO 3 nanocrystals were carried out by a modified sol-gel method, similar to a method reported elsewhere for the synthesis of doped BaTiO 3 [19]. The method is as follows: them isostatically under the pressure of 5-6 t for 5 min.…”

Enhancement of the magnetoelectric effect in doped BaTiO3 nanoparticles

“…Whereas Kundu et al. () reported an increase of the dielectric permittivity () with a maximum at 0.3 mol Fe dopant, Guo et al. () observed a significant decrease of in Fe doped BTO as the Fe‐doping level increases.…”

“…Therefore, alternative mechanisms are required to combine these two properties. Magnetic properties are observed experimentally in Co-, Mn-, Cr-and Fe-doped BTO thin films and nanoparticles [2][3][4][5][6][7][8]. Multiferroic reports on doped PbTiO 3 (PTO) nanostructures are similar to those of BTO.…”

“…The obtained results concerning the effects of Fe-doping on the dielectric properties in BTO-NP are controversial. Whereas Kundu et al [6] reported an increase of the dielectric permittivity ( ) with a maximum at 0.3 mol% Fe dopant, Guo et al [8] observed a significant decrease of in Fe doped BTO as the Fe-doping level increases. Moreover, in Fe doped PTO nanostructures one has observed an increase [9] or a decrease [10] of magnetization M with reduction in particle size or film thickness, respectively.…”