Synthesis, structure, and magnetic properties of the layered bismuth transition metal oxide solid solution Bi2Fe4−xGaxO9

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Abstract

The solid solution Bi2Fe4−xGaxO9 (0 ≤ x ≤ 4) was was synthesized and investigated by X-ray diffraction, Moössbauer spectroscopy, and susceptibility measurements. The system was found essentially to follow Vegard's law. The crystal structure of thex = 2 member, Bi2Fe2Ga2O9, was solved. The structure is orthorhombic with space group Pbam (No. 55), a = 7.946(1)Å, b = 8.355(1)Å, and c = 5.929(1)Å. Iron and gallium were nonstatistically distributed over two octahedral and two tetrahedral sites. The iron displayed a 60% preference for the octahedral positions. Magnetic susceptibility and Moössbauer measurements showed antiferromagnetic behavior. The ordering temperature, TN, exhibited a strong dependence on x, decreasing rapidly with gallium doping from TN = 245 ± 5K for x = 0 to TN < 4.2K for x = 3. Spin-glass-like behavior was observed in the gallium-substituted compounds, and a previously undetected spin rearrangement at 220 K for the x = 0 compound is reported.

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    • Synthesis, structural, electrical and magnetic properties of Bi <inf>2</inf> Fe <inf>4-x</inf> Ga <inf>x</inf> O <inf>9</inf> (0 ≤ x ≤ 1.6)

      2019, Ceramics International
      Citation Excerpt :

      On the other side, low-temperature spin-glass (SG) phase emerges despite the drop of TN by nonmagnetic dilution. However, the dramatic reduction of TN in Bi2Fe4-xGaxO9 is not merely a percolation effect, as shown in dependence of TN on Ga-concentration, more probably related to the geometric spin frustration caused by next neighbor exchange interaction [22]. In the ZFC magnetic susceptibility of lightly doped samples, two kinks were observed at 225 K and 16 K for x = 0.2 while 148 K and 29 K for x = 0.4 respectively, as shown in Fig. 3 (b, c).

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