Open AccessStructure and electric properties of cerium substituted SrBi1.8Ce0.2Nb2O9 and SrBi1.8Ce0.2Ta2O9 ceramics
Author(s) -
Mohamed Afqir,
Amina Tachafine,
Didier Fasquelle,
M. Elaatmani,
Jean-Claude Carru,
Abdelouahad Zegzouti,
Mohamed Daoud
Publication year - 2016
Publication title -
processing and application of ceramics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.326
H-Index - 15
eISSN - 2406-1034
pISSN - 1820-6131
DOI - 10.2298/pac1603183a
Subject(s) - materials science , aurivillius , dielectric , dissipation factor , ceramic , raman spectroscopy , analytical chemistry (journal) , dielectric loss , cerium , curie temperature , doping , mineralogy , ferroelectricity , composite material , ferromagnetism , metallurgy , optics , condensed matter physics , chemistry , physics , optoelectronics , chromatography
SrBi1.8Ce0.2Nb2O9 (SBCN) and SrBi1.8Ce0.2Ta2O9 (SBCT) powders were prepared via solid-state reaction method. X-ray diffraction analysis reveals that the SBCN and SBCT powders have the single phase orthorhombic Aurivillius structure at room temperature. The contribution of Raman scattering and FTIR spectroscopy of these samples were relatively smooth and resemble each other. The calcined powders were uniaxially pressed and sintered at 1250 °C for 8 h to obtaine dense ceramics. Dielectric constant, loss tangent and AC conductivity of the sintered Ce-doped SrBi2Nb2O9 and SrBi2Ta2O9 ceramics were measured by LCR meter. The Ce-doped SBN (SBCN) ceramics have a higher Curie temperature (TC) and dielectric constant at TC (380 °C and ε′ ∼3510) compared to the Ce-doped SBT (SBCT) ceramics (330 °C and ε′ ∼115) when measured at 100 Hz. However, the Ce-doped SBT (SBCT) ceramics have lower conductivity and dielectric loss