Effect of Nickel and Cobalt co-substitution on the structural and dielectric properties of Barium Titanate ceramics
- PDF / 2,149,690 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 86 Downloads / 231 Views
Effect of Nickel and Cobalt co-substitution on the structural and dielectric properties of Barium Titanate ceramics Akhil Raman T. S.1, Vishnu R. Nair1, and K. C. James Raju1,* 1
School of Physics, University of Hyderabad, Hyderabad 500046, India
Received: 22 July 2020
ABSTRACT
Accepted: 14 October 2020
The influence of Nickel and Cobalt co-substitution on the structure and dielectric properties of barium titanate (BaTiO3) ceramics has been investigated. Nickel and Cobalt co-substituted BaTiO3 ceramics with general formula BaTi1-x(Ni,Co)xO3 has been synthesized for x = 0.0, 0.02, 0.04 and 0.08 through conventional solid state reaction route. The structural analysis carried out by X-ray diffraction reveals the successful incorporation of Ni2? and Co2? ions in the Ti4? site of BaTiO3 with all samples under study having tetragonal structure. However the tetragonality (c/a ratio) seems to be decreasing with increase of cosubstitution. The dielectric measurements are done at different frequencies and temperatures. The room temperature dielectric constant decreased considerably for the Ni and Co co-substituted samples. The phase transition of the BaTi1-x(Ni,Co)xO3 has been investigated by studying the temperature dependence of dielectric constant. Nickel and Cobalt co-substituted samples showed diffused nature of phase transition with a notable reduction in the Curie temperature with the increase of co-substitution. The Curie temperature is reduced to 104 °C for x = 0.08 composition whereas for x = 0.0 the Curie temperature is 123 °C. Enhancement in conductivity is observed with addition of Nickel and Cobalt addition. Nearest-neighbour hopping model is used to explain the conduction in the samples under study and energy of activation for conduction is calculated from Arrhenius plot.
Ó
Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction BaTiO3 is a versatile room temperature ferroelectric material having high dielectric constant along with pyro electric and piezo electric properties. These properties make BaTiO3 a promising material for the
Address correspondence to E-mail: [email protected]
https://doi.org/10.1007/s10854-020-04687-8
manufacture of capacitors, ferroelectric memory devices, transducers, multilayer ceramic capacitors (MLCC), microwave tunable devices, thermistors etc. [1, 2]. Various processes such as doping, substitution and different sintering processes has been employed to improve the physical properties of BaTiO3 [3–9].
J Mater Sci: Mater Electron
The perovskite structure (ABO3) of BaTiO3 facilitate the substitution or co-substitution at A site with mono, di or trivalent cations or B site with di, tri, tetra or pentavalent cations respectively [1, 2, 10, 11]. Addition of multivalent 3d transition metal ion in BaTiO3 can enhance the dielectric, ferroelectric and electrical properties [12–14] and give rise to magnetism in BaTiO3 making it a candidate for multiferroic material [15–17]. Jana et al. reported that doping Nickel to BaTiO3 will improve the dielectri
Data Loading...
