Structure-property relationships in BaTiO3-BiFeO3-BiYbO3 ceramics

SCHILEO, Giorgio, LUISMAN, Luke, FETEIRA, Antonio, DELUCA, Marco and REICHMANN, Klaus (2013). Structure-property relationships in BaTiO3-BiFeO3-BiYbO3 ceramics. Journal of the European Ceramic Society, 33 (8), 1457-1468.

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Ba1-xBixTi1-xYbx/2Fex/2O3 ceramics were fabricated by the solid state reaction method. X-ray diffraction analysis show 0 ≤ x ≤ 0.04 ceramics to have an average crystal structure described by the non-centrosymmetric tetragonal P4mm space group, whereas x ≥ 0.08 ceramics are consistent with a centrosymmetric cubic perovskite (space group Pm-3m). Coexistence of both tetragonal and cubic symmetries is observed for x=0.06. Raman spectroscopy analysis corroborate a change in average structure with increasing x, but also show the local crystal symmetry for x ≥ 0.08 ceramics to deviate from the idealized cubic perovskite structure. Dielectric data show a ferroelectric-to-relaxor crossover, which occurs in conjunction with the change in both the average and local crystal symmetry as indicated by X-ray and Raman data. For x ≥ 0.08, ceramics exhibit weak-relaxor behavior, which is also accompanied by a shift of the permittivity maxima towards higher temperatures with increasing x.

Item Type: Article
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Corrosion Technology
Identification Number:
Page Range: 1457-1468
Depositing User: Antonio Feteira
Date Deposited: 14 Nov 2013 17:05
Last Modified: 18 Mar 2021 19:45

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