Lead-free perovskite Ba(Al 1/2 Nb 1/2 )O 3 was prepared by conventional ceramic fabrication technique at 13501C/5 h in air atmosphere. The crystal symmetry, space group and unit cell dimensions were determined from the experimental results using FullProf software whereas crystallite size and lattice strain were estimated from Williamson-Hall approach. X-ray diffraction analysis of the compound indicated the formation of a singlephase monoclinic structure with the space group P2/m. EDAX and SEM studies were carried out in order to evaluate the quality and purity of the compound. Permittivity data showed lowtemperature coefficient of capacitance (T CC 5 14%) up to 1001C. To find a correlation between the response of the real system and idealized model circuit composed of discrete electrical components, the model fittings were presented using the impedance data. Complex impedance analyses suggested the dielectric relaxation to be of non-Debye type. The correlated barrier-hopping model was used to successfully explain the mechanism of charge transport in Ba(Al 1/2 Nb 1/2 )O 3 .
Lead-free (1 -x)Ba(Y 1/2 Nb 1/2 )O 3 -xBaTiO 3 ; (0 B x B 1) ceramics have been synthesized using solidstate reaction method and characterized by X-ray diffraction, scanning electron microscopy, dielectric and impedance studies. The crystal-structure of the compounds is found to be cubic with the space group Pm3m(221) except for BaTiO 3 for which it is tetragonal (P4/mmm). Complex impedance spectroscopy analysis indicated the presence of non-Debye type dielectric relaxation in Ba(Y 1/2 Nb 1/2 )O 3 -BaTiO 3 system. Compound 0.25Ba(Y 1/2 Nb 1/2 )O 3 -0.75Ba-TiO 3 exhibited a low value of temperature coefficient of capacitance (\±8 %) in the working temperature range (up to ?100°C), room temperature dielectric constant equal to 295 and low loss tangent (0.039) which meets the specifications for ''Z5F'' of Class I dielectrics of Electronic Industries Association. Hence, this composition might be a suitable candidate for capacitor applications. Ac conductivity and electric modulus studies supported the hopping type of conduction in the system and frequency dependent ac conductivity data obeyed Jonscher's power law.
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