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 gap 、 Electrical impedance 、 Electronic structure 、 Photoemission spectroscopy 、 Density of states 、 Dielectric spectroscopy 、 Chemistry 、 Condensed matter physics 、 Relaxation (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.