Substitution Mechanism of Mn and Fe Ions in ${\\rm Bi}_{4}{\\rm Ti}_{3}{\\rm O}_{12}$

Author

Nishimura, Kosuke ; Yoshioka, Takashi ; Yamamoto, Takayuki

Author_Institution

Fac. of Sci. & Eng., Waseda Univ., Tokyo, Japan

Volume

50

Issue

6

fYear

2014

fDate

Jun-14

Firstpage

1

Lastpage

6

Abstract

Single-phased polycrystalline Mn- and Fe-doped Bi₄Ti₃O₁₂ were fabricated using a solid-state reaction technique, doping with various concentrations of Mn and Fe ions. Substitution mechanism of Mn and Fe ions in Bi₄Ti₃O₁₂ were investigated with X-ray absorption near-edge structure (XANES) measurements and first-principles calculations. The valence states of the Mn and Fe ions are 4+ and 3+, respectively, inferred from the L_2,3-edge XANES profiles. From the K-edge XANES analysis, it is determined that Mn and Fe ions are substituted at one of the Ti sites, i.e., Ti(2a) or Ti(4e) sites. Our first-principles total electronic energy calculations suggest that Mn ions are likely to substitute at Ti(2a) sites rather than at Ti(4e) sites, whereas the opposite is true for Fe substitution. Taken together, these results give a clear description of the locations and charge states of the Mn and Fe dopants in Bi₄Ti₃O₁₂.

Keywords

XANES; ab initio calculations; bismuth compounds; crystal growth; doping; iron; manganese; total energy; Bi₄Ti₃O₁₂:Fe; Bi₄Ti₃O₁₂:Mn; K-edge XANES; X-ray absorption near-edge structure measurements; charge states; doping; first-principles total electronic energy calculations; single-phased polycrystalline bismuth titanate; solid-state reaction technique; substitution mechanism; valence states; Absorption; Bismuth; Crystals; Ions; Iron; Manganese; X-ray scattering; Bismuth titanate; X-ray absorption near-edge structure (XANES); first-principles calculation; substitution mechanism;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2014.2301447

Filename

6832789