Abstract
Polycrystalline samples of BaTi1−x(Mn0.5Nb0.5)xO3 with x = 0.025, 0.05, 0.075, 0.1, 0.125, 0.15, and 0.175 have been synthesized by the high-temperature solid-state reaction technique. The effects of cationic substitution of manganese and niobium for titanium at B sites of the BaTiO3 perovskite lattice on symmetry and dielectric properties were investigated. X-ray diffraction at room temperature and dielectric permittivity in the temperature range from 85 K to 500 K and frequency range from 100 Hz to 2 × 105 Hz were studied. The evolution from a normal ferroelectric to a relaxor ferroelectric is emphasized. TC or Tm decreases when both manganese and niobium are introduced into the lattice of BaTiO3. High dielectric constant of around 9000 at TC = 280 K was found for Ba Ti0.925(Mn0.5Nb0.5)0.075O3 ceramic. A relaxor ferroelectric with ΔTm = 60 K and \( \varepsilon_{\rm{r}}^{\prime } \) of about 3500 at 10 kHz with Tm = 150 K was found for the BaTi0.85(Mn0.5Nb0.5)0.15O3 sample.
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