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No.3(pp.81-113)

Home > Issues > Volume 13 (2008) > No.3(pp.81-113)

Temperature Dependent Cation Distribution in Tb₂Bi₁Ga₁Fe₄O₁₂

Journal of Magnetics, Volume 13, Number 3, 30 Sep 2008, Pages 110-113

Il-Jin Park(Department of Physics, Kookmin University), Chu-Sik Park(Hydrogen Energy R&D Center, Korea Institute of Energy Research), Kyoung-Soo Kang(Hydrogen Energy R&D Center, Korea Institute of Energy Research), Chul-Sung Kim*

(Department of Physics, Kookmin University)

Abstract

In this study, heavy rare earth garnet Tb₂Bi₁Ga₁Fe₄O₁₂powders were fabricated by a sol-gel and vacuum annealing process. The crystal structure was found to be single-phase garnet with a space group of Ia3d. The lattice constant a₀was determined to be 12.465Å. From the analysis of the vibrating sample magnetometer (VSM) hysteresis loop at room temperature, the saturation magnetization and coercivity of the sample are 7.64 emu/g and 229 Oe, respectively. The N_e'el temperature(T_N) was determined to be 525 K. The Mö ssbauer spectrum of Tb₂Bi₁Ga₁Fe₄O₁₂at room temperature consists of 2 sets of 6 Lorentzians, which is the pattern of single-phase garnet. From the results of the Mö ssbauer spectrum at room temperature, the absorption area ratios of Fe ions on 24d and 16a sites are 74.7% and 25.3%(approximately 3:1), respectively. These results show that all of the non-magnetic Ga atoms occupy the 16a site by a vacuum annealing process. Absorption area ratios of Fe ions are dependent not only on a sintering condition but also on the temperature of the sample. It can then be interpreted that the Ga ion distribution is dependent on the temperature of the sample. The Mö ssbauer measurement was carried out in order to investigate the atomic migration in Tb₂Bi₁Ga₁Fe₄O₁₂.

Keywords: vacuum annealing process; Tb_3-sBi_sFe_5O_12; cation distribution; Mö ssbauer spectroscopy

DOI: 10.4283/JMAG.2008.13.3.110

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