Processing and Application of Ceramics 2017 Volume 11, Issue 3, Pages: 191-200
https://doi.org/10.2298/PAC1703191C
Full text ( 2706 KB)
Structure and electrical properties of Ba(In0.5Nb0.5)1-xTixO3 ceramics
Chandra Kumar P. (S.M. College, Department of Physics, Bhagalpur, India)
Kulkarni Ajit R. (Indian Institute of Technology, Department of Metallurgical Engineering and Materials Science, Mumbai, India)
Priyanka (T.M. Bhagalpur University, University Department of Physics, Materials Research Laboratory, Bhagalpur, India)
Prasad Kamal (T.M. Bhagalpur University, University Department of Physics, Materials Research Laboratory, Bhagalpur, India)
Lead-free Ba(In0.5Nb0.5)1-xTixO3 (0 ≤ x ≤ 1) ceramics was synthesized using a
standard high temperature solidstate reaction method and sintered at 1400°C/4
h (except the pure BaTiO3 which was sintered at 1300°C/4 h). The ceramics was
characterized by X-ray diffraction, scanning electron microscopy, dielectric,
impedance and AC conductivity studies. The crystal structure of the compounds
was found to be cubic (with the space group Pm3m) for x = 0,0.25 and 0.50
and tetragonal (P4/mmm) for x = 0.75 and 1.0. Increase in Ti-content in the
ceramic samples leads to the decrease in unit cell volume while the values of
real as well as imaginary parts of dielectric constant and AC conductivity
increase. Complex impedance spectroscopy analysis indicated the negative
temperature coefficient of resistance. AC conductivity data supported the
hopping type of conduction in the system and obeyed Jonscher’s power law. The
real and imaginary parts of dielectric constant and AC conductivity data fit
excellently well with an exponential function.
Keywords: Ba(In0.5Nb0.5)1-xTixO3, perovskite structure, electrical and dielectric properties