New (Bi1.88Fe0.12)(Fe1.42Te0.58)O6.87 Pyrochlore with Spin-Glass Transition
收藏Figshare2016-02-23 更新2026-04-29 收录
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https://figshare.com/articles/dataset/New_Bi_sub_1_88_sub_Fe_sub_0_12_sub_Fe_sub_1_42_sub_Te_sub_0_58_sub_O_sub_6_87_sub_Pyrochlore_with_Spin_Glass_Transition/2648833
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The synthesized (Bi1.88Fe0.12)(Fe1.42Te0.58)O6.87 is characterized with so far the highest Fe content among pyrochlores. Consequently, it exhibits a strong spin-glass magnetic transition at around 20 K. The dielectric relaxation in the same temperature range originates from multiwall hopping of the displaced ions on A and O′ sites. The displacement was confirmed with the structural analysis of the pyrochlore using Rietveld refinement on joint neutron and X-ray diffraction data. At room temperature, the pyrochlore exhibits a cubic Fd3̅m symmetry (a = 10.38804 (13) Å) with Fe3+ ions sharing A and B structural sites. The refined results indicate on a displacive disorder with A-site positioned at 96g and O′ positioned at 32e. The lattice vibrational analysis using Raman spectra is in agreement with the displacive disorder of the pyrochlore.
创建时间：
2016-02-23
