TY  - JOUR
ID  - SisLab4499
UR  - https://doi.org/10.1016/j.jallcom.2021.158794
IS  - 158794
A1  - Pham, Duc Thang
A1  - Nguyen, Dang Co
A1  - Nguyen, Thi Minh Hong
A1  - Ho, Thi Anh
Y1  - 2021/01/16/
N2  - We have systematically studied the crystal and electronic structures and the magnetic and electrical polarization properties of polycrystalline Ba0.95Y0.05Fe12?xMnxO19 (denoted as BaYFe12?xMnxO19) compounds with x = 0?2. The analyzes of X-ray diffraction patterns and Raman scattering spectra indicated their single phase in the M-type hexaferrite structure. With increasing x, the lattice constant a slightly increased while c decreased, which related to the Jahn-Teller effect. Though an increase of x reduced gradually magnetization in a range of 23?32 emu/g, the coercive force increased from 3.3 kOe for x = 0 to about 4 kOe for x = 0.5?2. The study of the electrical polarization properties proved the dependence of the shape of electric hysteresis loops on x and applied electric field. The samples with x = 0 and 0.5 exhibit a weak ferroelectricity with the maximum polarization of ~0.11 ?C/cm2 for x = 0, and of ~0.06 ?C/cm2 for x = 0.5. Meanwhile, the other samples showed nearly circular hysteresis loops, which are characteristic of conductive materials. Detailed investigations indicated an increase in leakage current when x increased. All of such phenomena are tightly related to the chemical shift of Mn2+ ? Mn3+ and the replacement of Mn2+,3+ for Fe3+ in BaYFe12?xMnxO19. These oxidation states and the chemical shift of Mn have been confirmed upon analyzing X-ray absorption spectra
PB  - Elsevier B.V
JF  - Journal of Alloys and Compounds
VL  - 867
SN  - 0925-8388
TI  - Electronic structure and multiferroic properties of (Y, Mn)-doped barium hexaferrite compounds
AV  - restricted
ER  -