Lanthanum doped Ba1-xLaxTiO3 (BLT) with ( x = 0.005, 0.015, 0.02, 0.025) and
undoped Barium titanate BaTiO3 (BT) nanopowders were synthesized at Room
temperature via a semi-oxalate method with adjusting a pH of the solution around
(5.5).Crystallization processes and Particles size of prepared powders were studied,
measured and calculated by using X-ray diffraction. XRD analysis and Scanning Electron
Microscopy SEM techniques, and the particles size was found to be about 65 nm. The
dielectric properties (real є' and imaginary є" part of dielectric constant) of polymer/BT,
polymer/BLT nanocomposites, and UPE (unsaturated polyester resin) samples were
studied at different frequencies in the range of (20kHz-5MHz) using LCR meter, while
theoretical dielectric constant of the prepared samples were calculated by using
Bruggeman rule of mixture. The results of dielectric measurements found that the real
dielectric constant and tangent loss of the nanocomposites samples decreases with
increasing Lanthanum content.
Keywords: Barium titanate, BaTiO3, Piezoelectric, (Ba-La) TiO3, and Nanopowders.
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