An extension of the online implantation chamber used for emission Mossbauer Spectroscopy (eMS) at ISOLDE/CERN that allows quick removal samples offline low temperature studies is briefly described. We demonstrate how eMS data obtained during temperatures between 300 K and 650 short-lived parent isotopes combined with rapid cooling measurements decay isotope can give detailed information on bind...

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 ...

-Mixtures of synthetic Al-substituted goethite (a-Feo.814AloA86OOH) and hematite (a-Fel.658Alo.34203) (75, 50, 25, 3~ hematite by weight) were studied by M6ssbauer spectroscopy to evaluate the use of that technique for quantitative analysis. M6ssbauer spectra for these mixtures, obtained in the temperature range 12-130 K, were better fitted by a distribution of magnetic fields than by two magne...

The effect of pressure on the M6ssbauer resonance in hemin and in iron phthalocyanine has been measured. In these initial studies unenriched compounds were used. The hemin was material supplied by Dr. Lowell Hager of the Division of Biochemistry. The iron phthalocyanine was obtained from E. I. DuPont de Nemours Company and was resublimed in our laboratory. The high-pressure M6ssbauer techniques...

Several species of bacteria from both fresh water and marine enviornments were observed to orient and swim in a preferred direction in the geomag­ netic field (magnetotaxis) [1, 2J. Kalmijn and Blakemore [2] observed that most of the magneto­ tactic bacteria in sediments oriented and swam along magnetic field lines toward the north. Rever­ sal of the ambient magnetic field with Helmholtz coils ...

Homogeneous single crystals of EuO, Eu rich EuO and Gd doped EuO have been obtained and characterized by X-ray, microprobe analysis;Mossbauer, infrared spectroscopy and resistivity measurements versus temperature. Photoconductivity, Hall effect, optical and magnetic measurements are reported. They are interpreted within a simple model taking into account Coulomb, kinetic and exchange energies a...

THE PRESENCE of small amounts of iron in chromium metal results in a lowering of the Neel temperature along with other anomalous diagram[l, changes in the phase r 1 , 2]. Suscepti­[I] N eel bility measurements 1 below the tem­perature show that the iron sites have associ­ated with them localized magnetic moments of about 1·4f.LIJ I· per iron atom and that the iron moments remain paramagnetic do...

Ž . Although dissimilatory iron reducing bacteria DIRB are capable of reducing a number of metals in oxides and soluble forms, the factors controlling the raterextent of magnetite reduction and the nature of the mineral products resulting from magnetite reduction are not well understood. This study was carried out to investigate mechanisms and biogeochemical processes occurring during magnetite...

Mossbauer spectroscopy has been used to study both the physics and phenomenology of hydrogen absorption in rare-earth intermetallics. This paper surveys experiments that have been carried out so far, and discusses the results obtained. * * * * * * * * LaNi5 and similar intermetallic compounds have been of great interest recentlyl because of their ability to absorb reversibly large amounts of hy...