Slow (zero field)paramagnetic relaxation is reported for undiluted tetrahedral ferrous monomers for the first time. The Mossbauer spectra of Fe(2,9 di-CH3-phenanthroline)(NCS)2 and Fe(2,9 di-CH3 4,7 di-(j>-phenanthroline) (NCS)2 exhibit magnetic hyperfine splitting in the range 20 K to 1.6 K while the corresponding chlorides are rapidly relaxing paramagnets at all temperatures in zero field. Lo...

Ultrafine particles of SrFelzOts have been synthesized by citrate precursor technique. Solid state reactivity studies of citrate precursor lead to the formation oEfine particles of SrFe12019below 823K.Th.e size and m o r p h o l o g y o c e area measured by BETmethod for5.2nm clystallite is found to be27.45 m2fg. havingparticlesize42nm. UltrafinepaniclesofSrFe~zOlpshows interesting magnetic pro...

The phase composition, magnetic state of the phases and their influence on formation hysteresis properties nanocomposite with (Fe 0.85 Mn 0.10 Ni 0.05 ) 83 C 17 composition after mechanosynthesis subsequent annealing have been studied. It is shown that, although dependences coercive force temperature H_c(T ann alloy, measured at room liquid nitrogen temperatures, are curves maxima, H c driven b...

Silicon micromachined calorimeters ("calorimeter on a chip") are used to measure heat capacities and phase transition enthalpies for thin film, single crystal, and powder samples (5-500 mug). The technology is thus compatible with the small samples produced in multianvil and large diamond anvil cells. Techniques for handling small samples and attaching them to the calorimetric devices have been...

Matrix isolation techniques have been used in conjunction with Mossbauer spectroscopy to study europium atoms and clusters in solid argon. The measured isomer shift for Eu' monomers in argon was -6.1 mms-'. A value of 13 i: 2 lO-'fm* for the change in the mean square radius (A(?)) was calculated from the isomer shifts of Eu' and EuZ+S04. It was observed that the electron density at the lslEu nu...

— Iron 57-enriched, deoxygenated human (adult) hemoglobin (HbA), its isolated asHand /?sn-chains, and the partially iron 57-enriched, fully functional hemoglobin a2(Fe) j82(Fe) were investigated by Mossbauer spectroscopy in the temperature range 4.2 K-200 K. According to our experimental accuracy ( ± 0.006 mm s) the temperature dependent quadrupole splittings &EQ(T) of deoxygenated HbA, <XSHand...

Abstract M-type Barium hexaferrite is a famous hard magnetic material with hexagonal crystal structure. La substituted hexaferrite, Ba (1-x) (x) Fe 12 O 19 , (where, x = 0.25 and 0.30) were synthesized using ball milling followed by sintering at 1300 °C for 5 hours. X-ray diffraction patterns reveal the formation of single-phase magnetoplumbite structure barium which belongs to P6 3 /mmc space ...