Open AccessSynthesis and characterization of lead-free ternary component BST–BCT–BZT ceramic capacitors
Author(s) -
Venkata Sreenivas Puli,
Dhiren K. Pradhan,
Brian C. Riggs,
Shiva Adireddy,
Ram S. Katiyar,
Douglas B. Chrisey
Publication year - 2014
Publication title -
journal of advanced dielectrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.38
H-Index - 13
eISSN - 2010-135X
pISSN - 2010-1368
DOI - 10.1142/s2010135x14500143
Subject(s) - materials science , dielectric , ferroelectricity , analytical chemistry (journal) , coercivity , phase transition , tetragonal crystal system , hysteresis , permittivity , electric field , dielectric loss , ceramic , lattice constant , condensed matter physics , diffraction , crystal structure , composite material , crystallography , optics , optoelectronics , chemistry , physics , chromatography , quantum mechanics
Polycrystalline sample of lead-free 1/3( Ba 0.70 Sr 0.30 TiO 3 ) + 1/3( Ba 0.70 Ca 0.30 TiO 3 ) + 1/3( BaZr 0.20 Ti 0.80 O 3 )( BST - BCT - BZT ) ceramic was synthesized by solid state reaction method. Phase purity and crystal structure of as-synthesized materials was confirmed by X-ray diffraction (XRD). Temperature-dependent dielectric permittivity studies demonstrated frequency-independent behavior, indicating that the studied sample has typical diffuse phase transition behavior with partial thermal hysteresis. A ferroelectric phase transition between cubic and tetragonal phase was noticed near room temperature (~ 330 K). Bulk P–E hysteresis loop showed a saturation polarization of 20.4 μC/cm 2 and a coercive field of ~ 12.78 kV/cm at a maximum electric field of ~ 115 kV/cm. High dielectric constant (ε ~ 5773), low dielectric loss (tan δ ~ 0.03) were recorded at room temperature. Discharge energy density of 0.44 J/cm 3 and charge energy density of 1.40 J/cm 3 were calculated from nonlinear ferroelectric hysteresis loop at maximum electric field. Dielectric constant at variable temperatures and electric fields, ferroelectric to paraelectric phase transition and energy storage properties were thoroughly discussed.