Impedance spectroscopy, electronic structure and X-ray photoelectron spectroscopy studies of Pb(Fe1/2Nb1/2)O3

作者: Chandrahas Bharti , Alo Dutta , Santiranjan Shannigrahi , S.N. Choudhary , R.K. Thapa

DOI: 10.1016/J.ELSPEC.2008.12.001

关键词: Band gapElectrical impedanceElectronic structurePhotoemission spectroscopyDensity of statesDielectric spectroscopyChemistryCondensed matter physicsRelaxation (NMR)X-ray photoelectron spectroscopy

摘要: Abstract Impedance spectroscopy is used to study the electrical behaviour of lead iron niobate, Pb(Fe1/2Nb1/2)O3 (PFN) in frequency range from 100 Hz 1 MHz and temperature 203 363 K. The frequency-dependent data are analyzed by impedance conductivity formalisms. complex plane plot shows that relaxation (conduction) mechanism PFN purely a bulk effect arising semiconductive grains. sample framework electric modulus formalism modelled Davidson–Cole equation. scaling imaginary suggests describes same at various temperatures. We have studied electronic structure using X-ray photoemission (XPS). density states (DOS) obtained first principles full potential linearized augmented wave calculation direct energy gap ∼0.43 eV. XPS spectrum compared with calculated DOS spectra. It has been observed properties dominated interaction between transition metal oxygen ions as its valence band consists mainly p-states hybridized d-states.

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