Mössbauer studies of FeAl2O4 and FeIn2S4 spin glass spinels

Redox Treatment of an Fe/Al Pillared Montmorillonite. A Mössbauer Study

“…However, due to its small spectral contribution, only one doublet has been used to describe iron in both of these sites. At 4.2 K the spectrum is similar to that reported for FeA1204 (Dormann et al, 1990), apart from the fact that in the SR1 there is an extra spectral component in addition to the Fe 2+ of FeA120,. Thus, the M6ss-bauer analysis suggests that the pillars of sample SR 1 are identified as Fe3-xAlxO4, where Fe atoms occupy the A and B sites of the magnetite structure.…”

Structural and magnetic study of Al3+ doped Ni0.75Zn0.25Fe2−xAlxO4 nanoferrites

“…M Zn and M Ni is the molecular weight for corresponding nitrate salts and m Zn and m Ni is the mass of corresponding nitrate salts used in synthesis, Table 3 presents actual chemical composition for all x values of the samples. In agreement with earlier measurements, Al 3+ has preference for both A and B sites over a range of aluminum concentration in support to earlier reports on FeAl 2 O 4 that has been confirmed by Mossbauer and neutron diffraction studies [60,61]. Furthermore it is observed that at low concentration, x 0.4, Al 3+ has preference for tetrahedral A site, whereas at higher Al 3+ content, Al 3+ prefers octahedral B site.…”

Mössbauer study of miniature vessels from the Sicán burial site of Huaca Loro

“…The Mössbauer spectra are typical for the presence of hercynite (FeAl 2 O 4 ), which exhibits a magnetic hyperfine splitting at 4.2 K [7,8], but they also show the presence of a glassy phase which still yields a quadrupole doublet at 4.2 K [4]. The formation of these phases during firing under reducing conditions requires firing temperatures in excess of about 750 • C [4].…”