Electrical Properties of Barium and Zirconium Modified NBT Ferroelectric Ceramics

Journal Article · Tue Nov 22 00:00:00 EST 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3644413· OSTI ID:21608500

Rao, K Sambasiva; Tilak, B; Swathi, A; Workineh, Haileeyesus ^[1]; Rajulu, K Ch. Varada ^[2]

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1. Department of Physics, Andhra University, Visakhapatnam-530003 (India)
2. Indian Plywood Industries Research and Training Institute (IPIRTI), Bangalore (India)

Recently a new wave of interest has risen on relaxor ferroelectrics with complex perovskite structure due to their wide use in fabrication of multilayer ceramic capacitors, electrostrictive actuators, and electromechanical transducers. The polycrystalline 0.93(Bi{sub 0.5}Na{sub 0.5})Ba{sub 0.07}Z{sub 0.04}T{sub 0.96}O{sub 3}(0.07BNBZT) ceramic material, which is in the vicinity of the morphotropic phase boundary (MPB) has been prepared by using high temperature solid state reaction method. The tolerance factor has been estimated and found to be 0.815. XRD analysis revealed a rhombohedral perovskite type structure. SEM micrographs showed highly dense grains with rectangular shape. The average grain size is found to be 1.51{mu}m. Dielectric studies in the material ha indicated relaxor behaviour with diffuse phase transition. High value of {epsilon}{sub m}>1958 is found at 1kHz, Tm (phase transition temperature) 335 deg. C, The diffuseness parameter was established to be 1.60 revealing the relaxor behaviour. Further, to confirm the relaxor behaviour in the material, Vogel-Fulcher (V-F) relation has been used. Estimated V-F parameters are found to be T{sub f} = 138 deg. C, E{sub a} = 0.080 eV and {nu}{sub o} = 2.32x10{sup 8} Hz. Cole-Cole analysis has shown a non-Debye type relaxation in the system. Conductivity studies in the material obeyed the Jonscher's power law in frequency range of (45Hz-5MHz) and temperature range of (35 deg. C - 600 deg. C). The electric conduction in the system may be due to hopping/mobility/ transportation of charge carriers.

• OSTI ID: 21608500
• Journal Information: AIP Conference Proceedings, Vol. 1372, Issue 1; Conference: NSFD-14: 14. national seminar on ferroelectrics and dielectrics, Bilaspur, Chhattisgarh (India), 2-4 Dec 2010; Other Information: DOI: 10.1063/1.3644413; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM COMPOUNDS
CERAMICS
CHARGE CARRIERS
ELECTRIC CONDUCTIVITY
EV RANGE
FERROELECTRIC MATERIALS
GRAIN SIZE
LAYERS
MOBILITY
PERMITTIVITY
PHASE TRANSFORMATIONS
PIEZOELECTRICITY
POLARIZATION
POLYCRYSTALS
SCANNING ELECTRON MICROSCOPY
TITANATES
TRANSITION TEMPERATURE
TRIGONAL LATTICES
X-RAY DIFFRACTION
ZIRCONIUM COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
DIELECTRIC MATERIALS
DIELECTRIC PROPERTIES
DIFFRACTION
ELECTRICAL PROPERTIES
ELECTRICITY
ELECTRON MICROSCOPY
ENERGY RANGE
MATERIALS
MICROSCOPY
MICROSTRUCTURE
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
SIZE
THERMODYNAMIC PROPERTIES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS