Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8002800 | Journal of Alloys and Compounds | 2013 | 5 Pages |
Abstract
The present study is the first in which the theoretical prediction of the changes in the density of states of single crystal of PbFe1/2Nb1/2O3 (PFN) multiferroic depending on a temperature at the ferroelectric - paraelectric transition is experimentally confirmed by the X-ray photoelectron spectroscopy. The valence band XPS spectra of PFN single-crystal at three temperatures T1Â =Â 297Â K (monoclinic phase), T2Â =Â 368Â K (tetragonal) and T3Â =Â 403Â K (cubic) were obtained by X-ray photoelectron study using ESCALAB 250. It is found out that the experimental valence band XPS spectra of PFN single-crystals in ferroelectric and paraelectric phases consist of two main peaks with a difference in relative intensity and energy position of the second peak. The density of states of PFN was calculated for tetragonal ferroelectric (368 K) and cubic paraelectric (403Â K) phases. The first main peak corresponds to strongly hybridized Fe3d, Nb3d and O2p states while the second peak is mainly composed of Pb6s states. According to the experimental data, the position of the second main peak of the total density of states of PFN in the ferroelectric monoclinic phase is shifted toward the first peak relatively to its position in the paraelectric phase by 0.28Â eV and for the tetragonal phase by 0.15Â eV, the latter value coincides well with the calculated value equal to 0.17Â eV.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
A.T. Kozakov, O.E. Polozhentsev, A.V. Soldatov, K.A. Googlev, A.V. Nikolsky, I.P. Raevski,