Structural, magnetic, and EPR studies of the Aurivillius phase Bi 6 Fe 2 Ti 3 O 18 and Bi 6 FeCrTi 3 O 18
Structural, magnetic, and EPR studies of the Aurivillius phase Bi 6 Fe 2 Ti 3 O 18 and Bi 6 FeCrTi 3 O 18
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DOI：
10.1103/physrevb.86.104410
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发表时间：
2012-09
影响因子：
3.7
通讯作者：
J. Yang;W. Tong;Zixuan Liu;X. B. Zhu;J. Dai;W. Song;Z. R. Yang;Y. Sun
中科院分区：
文献类型：
--
作者：
J. Yang;W. Tong;Zixuan Liu;X. B. Zhu;J. Dai;W. Song;Z. R. Yang;Y. Sun
The structural and magnetic properties of Bi${}_{6}$Fe${}_{2}$Ti${}_{3}$O${}_{18}$ and Bi${}_{6}$FeCrTi${}_{3}$O${}_{18}$ are investigated. The samples can be indexed by an orthorhombic lattice with the space group B2cb and the valence state of Fe and Cr ions is suggested to be $+$3 based on the x-ray photoelectron spectroscopy spectra. The sample Bi${}_{6}$Fe${}_{2}$Ti${}_{3}$O${}_{18}$ is paramagnetic with the presence of a short-range antiferromagnetic ordering; whereas Bi${}_{6}$FeCrTi${}_{3}$O${}_{18}$ undergoes a short-range ferrimagnetic-like transition at 106 K originating from the spin canting of the antiferromagnetic coupling of Fe-based and Cr-based sublattices via the Dzyaloshinskii-Moriya interaction due to the distorted crystal structure of Bi${}_{6}$FeCrTi${}_{3}$O${}_{18}$, which are in agreement with the EPR results. The magnetic structure and EPR spectra of Bi${}_{6}$Fe${}_{2}$Ti${}_{3}$O${}_{18}$ and Bi${}_{6}$FeCrTi${}_{3}$O${}_{18}$ can be understood by the presence of a small amount of isolated Fe${}^{3+}$ ions in an octahedral ligand field with a low symmetry and the coupling between the random occupancy of Fe${}^{3+}$ and/or Cr${}^{3+}$ ions in other two octahedral sites in the layered structure of Aurivilius phase.
The structural and magnetic properties of Bi${}_{6}$Fe${}_{2}$Ti${}_{3}$O${}_{18}$ and Bi${}_{6}$FeCrTi${}_{3}$O${}_{18}$ are investigated. The samples can be indexed by an orthorhombic lattice with the space group B2cb and the valence state of Fe and Cr ions is suggested to be $+$3 based on the x-ray photoelectron spectroscopy spectra. The sample Bi${}_{6}$Fe${}_{2}$Ti${}_{3}$O${}_{18}$ is paramagnetic with the presence of a short-range antiferromagnetic ordering; whereas Bi${}_{6}$FeCrTi${}_{3}$O${}_{18}$ undergoes a short-range ferrimagnetic-like transition at 106 K originating from the spin canting of the antiferromagnetic coupling of Fe-based and Cr-based sublattices via the Dzyaloshinskii-Moriya interaction due to the distorted crystal structure of Bi${}_{6}$FeCrTi${}_{3}$O${}_{18}$, which are in agreement with the EPR results. The magnetic structure and EPR spectra of Bi${}_{6}$Fe${}_{2}$Ti${}_{3}$O${}_{18}$ and Bi${}_{6}$FeCrTi${}_{3}$O${}_{18}$ can be understood by the presence of a small amount of isolated Fe${}^{3+}$ ions in an octahedral ligand field with a low symmetry and the coupling between the random occupancy of Fe${}^{3+}$ and/or Cr${}^{3+}$ ions in other two octahedral sites in the layered structure of Aurivilius phase.