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Synthesis, optical, and magnetic properties of six‐layered Aurivillius bismuth ferrititanate
Author(s) -
Huang Yanlin,
Mi Longqing,
Qin Jie,
Bi Shala,
Seo Hyo Jin
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16226
Subject(s) - aurivillius , materials science , photocatalysis , bismuth , rhodamine b , tantalate , bismuth titanate , bismuth ferrite , valence (chemistry) , rietveld refinement , crystal structure , analytical chemistry (journal) , crystallography , catalysis , chemistry , multiferroics , metallurgy , ferroelectricity , optoelectronics , biochemistry , organic chemistry , chromatography , dielectric
Abstract This work reports on the preparation, structure, photochemical, and magnetic properties of six‐layered Aurivillius bismuth ferrititanates, that is, Bi 7 Ti 3 Fe 3 O 21 , Bi 7 (Ti 2 Nb)Fe 3 O 21+δ , and Bi 7 (Ti 2 Mg)Fe 3 O 21−δ nanoparticles. The samples were prepared through the modified citrate complexation and precursor film process. The XRD Rietveld refinements were conducted to study the phase formations and crystal structure. The morphological and chemical component characteristics were investigated using SEM , TEM , and EDX analyses. Bi 7 Ti 3 Fe 3 O 21 , Bi 7 (Ti 2 Nb)Fe 3 O 21+δ , and Bi 7 (Ti 2 Mg)Fe 3 O 21−δ nanoparticles present an indirect allowed transitions with band energies of 2.04, 2.03, and 2.02 eV, respectively. The hybridized (O2p+Fe t 2g +Bi6s) formed the valence band ( VB ) and electronic components of (Ti–3d+Fe– e g ) formed the conduction band ( CB ) of this six‐layered Aurivillius bismuth ferrititanate. The three samples showed efficient photocatalytic degradation of Rhodamine B (RhB) dyes with the excitation wavelength λ > 420 nm. The optical absorption, photodegradation, and magnetic abilities were improved through microstructural modification on “B” site via partial substitution of Mg 2+ and Nb 5+ for Ti 4+ . The photocatalytic results were discussed based on the layer structure and multivalent Fe ions. Fe 3+/2+ in the perovskite slabs (Bi 5 Fe 3 Ti 3 O 19 ) 2− could act as the catalytic mediators in the photocatalysis process. As a photocatalyst, Aurivillius Bi 7 (Ti 2 Mg)Fe 3 O 21−δ nanoparticle is advantageous due to its photocatalytic and magnetically recoverable abilities.