The system will be going down for regular maintenance. Please save your work and logout.
Effects of the substitution of titanium by iron and niobium on the structure and dielectric properties in BaTi1-x(Fe0.5Nb0.5)xO3 solid solution
Language
en
Article de revue
This item was published in
Journal of Alloys and Compounds. 2007, vol. 427, p. 260-266
Elsevier
English Abstract
Polycrystalline samples of BaTi1−x(Fe0.5Nb0.5)xO3 with x = 0.025, 0.05, 0.075, 0.1, 0.125 and 0.15 have been synthesized by high-temperature solid-state reaction technique. The effects of cationic substitution of iron and ...Read more >
Polycrystalline samples of BaTi1−x(Fe0.5Nb0.5)xO3 with x = 0.025, 0.05, 0.075, 0.1, 0.125 and 0.15 have been synthesized by high-temperature solid-state reaction technique. The effects of cationic substitution of iron and niobium for titanium in the B sites for 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 to 500 K with frequencies range from 103 to 2 × 105 Hz, respectively, were studied. The evolution from a normal ferroelectric to a relaxor ferroelectric is emphasized. TC or Tm decreases when both iron and niobium are introduced in the lattice of BaTiO3. A high dielectric constant of around 30,000 at TC = 280 K was found for BaTi0.925(Fe0.5Nb0.5)0.075O3 ceramic. A relaxor ferroelectric with ΔTm = 12 K and ε′r about 13,800 at 10 kHz with Tm = 186 K was found for BaTi0.875(Fe0.5Nb0.5)0.125O3 sample.Read less <
English Keywords
Ferroelectrics
X-ray diffraction
Dielectric response
Origin
Hal imported