4.6 Article

Effect of Al3+ substitution on the structural, magnetic, and electric properties in multiferroic Bi2Fe4O9 ceramics

期刊

JOURNAL OF SOLID STATE CHEMISTRY
卷 227, 期 -, 页码 79-86

出版社

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2015.03.025

关键词

Bi2Fe4O9; Magnetic; Multiferroic material

资金

  1. National Natural Science Foundation of China [11174092]
  2. Henan Educational Committee [14A140019]
  3. Doctoral Scientific Research Foundation of Xinyang Normal University [0201312]

向作者/读者索取更多资源

Structural, magnetic, and electric properties have been investigated in polycrystalline Bi-2(Fe1-xAlx)(4)O-9 (0 <= x <= 0.25) ceramics synthesized by a modified Pechini method. Structural analysis reveals that Al3+ doped Bi2Fe4O9 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 Al3+ doping level. Compared with pure Bi2Fe4O9, room temperature coexistent multiferroic-like behavior is observed in Al3+ doped Bi2Fe4O9. By analyzing magnetic properties, the Neel temperature monotonously shifts to low temperatures from similar to 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. (C) 2015 Elsevier Inc. All rights reserved.

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