High temperature A.C. conductivity analysis of ZnO nanoparticles doped BaZr0.15Ti0.85O3 relaxor ceramics

This article covers the microstructure, AC conductivity (σac) and impedance analysis of lead-free polycrystalline BaZr0.15Ti0.85O3 (BZT) piezoceramics modified by the addition of 1 wt % ZnO nanoparticles synthesized by the conventional mixed oxide route. Nanoparticles of ZnO with an average diameter...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2020-06, Vol.587, p.412147, Article 412147
Main Authors: Rafiq, Muhammad Asif, Muhammad, Qaisar Khushi, Waqar, Moaz, Maqbool, Adnan, Hussain, Muhammad Asif, Manzoor, Muhammad Umar
Format: Article
Language:English
Subjects:
AC conductivity
Composition
Conductivity
Doping
Electrical resistivity
Grain size
High temperature
Impedance spectroscopy
Lead free
Microstructure
Nanoparticles
NTCR
Perovskite structure
Perovskites
Piezoelectric ceramics
Relaxors
Space group
Temperature
Zinc oxide
Zinc oxides
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Summary:This article covers the microstructure, AC conductivity (σac) and impedance analysis of lead-free polycrystalline BaZr0.15Ti0.85O3 (BZT) piezoceramics modified by the addition of 1 wt % ZnO nanoparticles synthesized by the conventional mixed oxide route. Nanoparticles of ZnO with an average diameter of ~41 nm have been produced via direct precipitation method. XRD study confirms the hexagonal symmetry (space group P63mc) of ZnO while sintered BZT ceramic compositions consist of single phase tetragonal perovskite structure with the space group (P4mm). Role of ZnO as sintering aid is confirmed via SEM analysis since dense microstructure (with increase in the grain size) of doped BZT composition was achieved. The negative temperature coefficient of resistance (NTCR) behavior which refers to decrease in electrical resistance with increase in temperature is investigated for both compositions while high temperature AC conductivity analysis proposed that the conduction in studied compositions is due to hopping charge mechanism. •Analysis of crystal structure, microstructure, and high temperature AC conductivity of ZnO nanoparticles doped BZT ceramics.•ZnO nanoparticles synthesized via direct precipitation method with space group p63mc and 41 nm crystallite size.•ZnO nanoparticles doped BZT ceramics have tetragonal symmetry with space group P4mm.•High temperature AC conductivity analysis confirms the hopping charge conduction mechanism.•Impedance spectroscopy (25-500 °C) revealed NTCR behavior of both compositions and non-Debye type relaxation behavior.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2020.412147