%0 Journal Article
%T Mössbauer Spectroscopic Characterization of Fe Occupation of Columns in the Nb<sub>28</sub>O<sub>70</sub> Structure
%A Osvaldo F. Schilling
%J World Journal of Condensed Matter Physics
%P 105-110
%@ 2160-6927
%D 2023
%I Scientific Research Publishing
%R 10.4236/wjcmp.2023.133007
%X In
search of an experimental route to produce linear arrays of spins without <span>the use of nanotechnological tools, we have doped
Nb<sub>28</sub>O<sub>70</sub> with sm</span>all amounts of transition metal
oxides<span style=\"font-family:;\" \"=\"\"> </span><span style=\"font-family:;\" \"=\"\">(TM; in
this case Fe<sub>2</sub>O<sub>3</sub>) or rare-earth oxides<sub>3</sub>, 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 <span>the widely spaced columns parallel to the
crystallographic <i>b</i>-axis in the</span> Nb<sub>28</sub>O<sub>70</sub> structure. To obtain further details about the TM
distribution, the previous investigation has been extended now to include a
room-temperature M<span style=\"white-space:nowrap;\">&amp;#246;</span>ssbauer spectroscopic analysis of the Fe-doped material. The
data are consistent with the presence of low-spin Fe<sup>3+</sup> ions in both
octahedral and tetrahedral coordinations of oxygens, and confirm</span><span style=\"font-family:;\" \"=\"\"> </span><span style=\"font-family:;\" \"=\"\">(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.</span>
%K M&amp
%K #246
%K ssbauer Spectroscopy
%K Niobium Oxides
%K Spin Arrays
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=127311