Dielectric relaxation and study of electrical conduction mechanism in BaZr0.1Ti0.9O3 ceramics by correlated barrier hopping model

• Autorzy: Mondal T. , Das S. , Sinha T. P. , Sarun P. M.

Identyfikatory

DOI

10.1515/msp-2018-0013

• Języki publikacji: EN

Abstrakty

EN

This work aims to study the electrical conduction mechanism in the dielectric material BaZr_0.1Ti_0.9 O₃ (BZT) ceramics by applying AC signal in the frequency range of 10² Hz to 10⁶ Hz. The phase purity and microstructure of the sample have been studied by X-ray diffraction refinement and field-emission scanning electron microscope (FE-SEM) analysis. The appearance of resonance peaks in the loss tangent at high temperature is due to inherent dielectric relaxation processes of this oxide. The temperature dependent Cole-Cole plot has been studied in details to determine both the grain and grain boundary contribution to the conductivity. Electrical modulus analysis reveals that the hopping of charge carriers is the most probable conduction mechanism in BZT ceramics. The obtained data of AC conductivity obey the universal double power law and have been discussed in terms of microstructural network characteristics. The behavior of frequency exponent n of AC conductivity as a function of temperature verify the applicability of the correlated barrier hopping (CBH) model. The AC conductivity data are used to estimate the minimum hopping length, density of states at Fermi level, thermal conductivity and apparent activation energy. The value of activation energy confirms that the oxygen vacancies play a vital role in the conduction mechanism.

Słowa kluczowe

EN

Rietveld refinement; dielectric relaxation; electrical conductivity mechanism; correlated barrier hopping model

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2018
• Tom: Vol. 36, No. 1
• Strony: 112--122
• Opis fizyczny: Bibliogr. 36 poz., rys., tab.

Twórcy

autor

Mondal T.

• Functional Ceramics Laboratory, Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad-826004, India

autor

Das S.

• Department of Physics, University of Calcutta, 92, Acharya Prafulla Chandra Road, Kolkata-700009, India

autor

Sinha T. P.

• Department of Physics, Bose Institute, 93/1, Acharya Prafulla Chandra Road, Kolkata-700009, India

autor

Sarun P. M.

• Functional Ceramics Laboratory, Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad-826004, India

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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).