6533b7dbfe1ef96bd126fec0
RESEARCH PRODUCT
X-ray and dielectric characterization of Co doped tetragonal BaTiO3 ceramics
Renata Bujakiewicz-korońskaAnna KalvaneD. M. NaleczLeonid VasylechkoEwa Markiewiczsubject
010302 applied physicsMaterials scienceRietveld refinementDopingchemistry.chemical_element02 engineering and technologyCrystal structureDielectric021001 nanoscience & nanotechnology01 natural scienceschemistry.chemical_compoundCrystallographyTetragonal crystal systemchemistry0103 physical sciencesBarium titanateGeneral Materials ScienceCrystallite0210 nano-technologyInstrumentationCobaltdescription
ABSTRACTThe crystal structure modifications of BaTiO3 induced by cobalt doping were studied. The polycrystalline (1 − x)BaTiO3 + xCo2O3 samples, with x ≤ 10 wt.%, were prepared by high temperature sintering conventional method. According to X-ray phase and structural characterization, performed by full-profile Rietveld refinement technique, all synthesized samples showed tetragonal symmetry perovskite structure with minor amount of parasitic phases. Pure single-phase composition has been detected only in the low level of doping BaTiO3. It was indicated that substitution of Co for the Ti sites in the (1 − x)BaTiO3 + xCo2O3 series led to decrease of tetragonality (c/a) of the BaTiO3 perovskite structure. This effect almost vanished in the (1 − x)BaTiO3 + xCo2O3 samples with nominal Co content higher than ∼1 wt.%, in which precipitation of parasitic Co-containing phases CoO and Co2TiO4 has been observed. Based on the results, the solubility limit of Co in Ti sub-lattice in the (1 − x)BaTiO3 + xCo2O3 series i...
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-11-10 | Phase Transitions |