In this work we have studied several NdFeB compositionally modulated thin films by using both conversion electron Mossbauer spectra and SOUIP magnetometry. Both the hyperfine fields and the easy magnetization magnitude are not correlated with the modulation characteristic length ( A ) while the magnetization perpendicular to the thin film plane decreases as A increases.

The high spin complex Fe(I1) (N, N'-dicyclohexylthiourea)~(C10~)~ exists in two forms which only differ in the distortion from octahedral symmetry of the environment of the Fe ion. Thermodynamic data for the transformation from one form to the other as obtained from Mossbauer spectroscopy are presented and a method to derive kinetic parameters is described.

Samples of dark to black fayalite from ten localities around the world were examined by 57Fe Mossbauer spectroscopy to see if any contained significant proportions of ferric iron. Of these ten samples, four, including a sample of ferrifayalite from Qianan County, China, previously known to contain ferric iron, were found to contain large amounts of this cation. Ferric/ferrous ratios of these sa...

the reaction kinetics of the isomerization 3,4-dichlorobutene-1 to 1,4-dichlorobutene-2 was investigated by using gas-liquid chromatography method in the presence of fe2o3/mgo as solid catalyst in the temperature range 25-55°c. fe2o3/mgo has been prepared by the support saturation method, tested in the isomerization of 3, 4-dichlorobutene-1 into 1, 4-dichlorobutene-2. this catalyst shows a high...

Mossbauer measurements at 4.2sTs22 K and OsHosBO kOe are + reported in (Fe Salen Cl);a' a molecular complex containing two coupled Fe3 ions bridged by oxygen atoms. At 4.2 K only the ground state with effective spin S ;::: 0 is appreciably populated. Analysis of the magnetic field and temperature dependence of the magnetic hyperfine field yields an exchange constant J ;::: 6.7 cmI and a hyperfi...

The anaerobic binding of Fe 2+ to apo and holo Mammalian ferritin has been studied in the pH range from 6.0 to 10.0. Mossbauer spectroscopy of samples in which the added Fe 2+ is enriched in Fe-57 shows that the Fe 2+ ions bind to the ferritin core and exchange electrons with Fe 3+ ions in the core.

Both Fe3 + and Fe2 + ions occur in FeCl3-doped polyacetylene. At low dopant levels ( < 0.01 mole frac­ tion) both Fe2 + and Fe3 + io'ns are paramagnetic down to 4.2 K. At dopant levels > 0.01 mole fraction, there is evidence from Mossbauer spectroscopy that Fe2+ ions associate into aggregates which are magneti­ cally ordered below 25 K. Aggregate formation appears to correlate with high electri...