"Electrical properties of Na2Pb2R2W<su" by Piyush R. DAS, B. N. PARIDA et al.

Article Title

Electrical properties of Na₂Pb₂R₂W₂Ti₄V₄O₃₀ (R = Dy, Pr) ceramics

Authors

Piyush R. DAS, Department of Physics, Institute of Technical Education & Research, Siksha ‘O’ Anusandahan University, Khandagiri, Bhubaneswar 751030, Odisha, India
B. N. PARIDA, Department of Physics, Institute of Technical Education & Research, Siksha ‘O’ Anusandahan University, Khandagiri, Bhubaneswar 751030, Odisha, India
R. PADHEE, Department of Physics, Institute of Technical Education & Research, Siksha ‘O’ Anusandahan University, Khandagiri, Bhubaneswar 751030, Odisha, India
R. N. P. CHOUDHARY, Department of Physics, Institute of Technical Education & Research, Siksha ‘O’ Anusandahan University, Khandagiri, Bhubaneswar 751030, Odisha, India

Keywords

ceramics, impedance spectroscopy, electrical properties, ferroelectricity, microstructure

Abstract

The polycrystalline samples of complex tungsten bronze (TB) Na₂Pb₂R₂W₂Ti₄V₄O₃₀ (R=Dy, Pr) compounds were prepared by solid-state reaction technique. Room- temperature preliminary structural studies confirm the formation of the compounds in the orthorhombic crystal system. Detailed studies of electrical properties of the materials using complex impedance spectroscopy technique exhibit that the impedance and related parameters are strongly dependent upon temperature and microstructure (bulk, grain boundary, etc). An observation of negative temperature coefficient of resistance (NTCR) suggests the materials have semiconducting properties. The variation of AC conductivity with temperature shows a typical Arrhenius behavior of the materials. Both the samples obey Jonscher’s universal power law. The existence of hopping mechanism in the electrical transport processes in the system with non-exponential type of conductivity relaxation is confirmed by electrical modulus analysis.

DOI

https://doi.org/10.1007/s40145-013-0048-y

Publisher

Tsinghua University Press

Recommended Citation

Piyush R. DAS, B. N. PARIDA, R. PADHEE et al. Electrical properties of Na2Pb2R2W2Ti4V4O30 (R = Dy, Pr) ceramics. Journal of Advanced Ceramics 2013, 2(2): 112-118.

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