Effect of Al{sup 3+} substitution on the structural, magnetic, and electric properties in multiferroic Bi{sub 2}Fe{sub 4}O{sub 9} ceramics

Journal Article · Wed Jul 15 00:00:00 EDT 2015 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2015.03.025· OSTI ID:22475683

Huang, S.; Shi, L. R.; Tian, Z. M. ^[1]; Zhu, C. M.; Gong, G. S. ^[1]; Qiu, Y. ^[2]

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1. School of Physics, Huazhong University of Science and Technology, Wuhan 430074 (China)
2. Henan Key Laboratory of Advanced Micro/Nano Functional Materials, School of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 464000 (China)

Structural, magnetic, and electric properties have been investigated in polycrystalline Bi{sub 2}(Fe{sub 1−x}Al{sub x}){sub 4}O{sub 9} (0≤x≤0.25) ceramics synthesized by a modified Pechini method. Structural analysis reveals that Al{sup 3+} doped Bi{sub 2}Fe{sub 4}O{sub 9} crystallizes in orthorhombic structure with Pbnm space group. Surface morphology of the end products is examined by scanning electron microscopy and the grain size has a tendency to decrease with increase in Al{sup 3+} doping level. Compared with pure Bi{sub 2}Fe{sub 4}O{sub 9}, room temperature coexistent multiferroic-like behavior is observed in Al{sup 3+} doped Bi{sub 2}Fe{sub 4}O{sub 9}. By analyzing magnetic properties, the Néel temperature monotonously shifts to low temperatures from ~260 K (x=0) to ~35 K (x=0.25). Moreover, the spin dynamic measured by the shift in ac magnetic susceptibility as a function of frequency provides a possibility of spin-glass-like behavior, which is further confirmed by fitting the critical slowing down power law and memory effect. - Graphical abstract: Compared with pure Bi{sub 2}Fe{sub 4}O{sub 9}, room temperature weak ferromagnetic property and enhanced ferroelectric-like behavior can be achieved simultaneously with proper Al{sup 3+} doping. - Highlights: • Bi{sub 2}(Fe{sub 1−x}Al{sub x}){sub 4}O{sub 9} (0≤x≤0.25) ceramics are fabricated via a Pechini method. • Weak ferromagnetic and ferroelectric behaviors can be achieved simultaneously. • Spin-glass-like behavior is detected with proper Al{sup 3+} doping. • The memory and aging effects are observed with proper Al{sup 3+} doping.

• OSTI ID: 22475683
• Journal Information: Journal of Solid State Chemistry, Vol. 227; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AGING
ALUMINIUM IONS
BISMUTH COMPOUNDS
CERAMICS
COMPARATIVE EVALUATIONS
DOPED MATERIALS
ELECTRICAL PROPERTIES
FERRITES
FERROELECTRIC MATERIALS
FREQUENCY DEPENDENCE
GRAIN SIZE
MAGNETIC SUSCEPTIBILITY
MORPHOLOGY
ORTHORHOMBIC LATTICES
POLYCRYSTALS
SCANNING ELECTRON MICROSCOPY
SPIN GLASS STATE
TEMPERATURE DEPENDENCE