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Mössbauer Spectroscopic Characterization of Fe Occupation of Columns in the Nb28O70 Structure

DOI: 10.4236/wjcmp.2023.133007, PP. 105-110

Keywords: Mössbauer Spectroscopy, Niobium Oxides, Spin Arrays

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In search of an experimental route to produce linear arrays of spins without the use of nanotechnological tools, we have doped Nb28O70 with small amounts of transition metal oxides (TM; in this case Fe2O3) or rare-earth oxides3, and investigated the location of the alien metal (Fe in this case) in the structure. Previous AC magnetic susceptibility measurements at low temperatures have been consistent with the formation of arrays of TM magnetic moments along the widely spaced columns parallel to the crystallographic b-axis in the Nb28O70 structure. To obtain further details about the TM distribution, the previous investigation has been extended now to include a room-temperature Mössbauer spectroscopic analysis of the Fe-doped material. The data are consistent with the presence of low-spin Fe3+ ions in both octahedral and tetrahedral coordinations of oxygens, and confirm (as suggested in the previous work) that Fe also interchanges positions with Nb ions located at tetrahedrally coordinated sites in the columns of the structure.


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