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Title: 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

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 andmore » 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.« less
Authors:
; ;  [1] ;  [1] ; ;  [1] ;  [2]
  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)
Publication Date:
OSTI Identifier:
22475683
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 227; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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