Summarised here are the conclusions of an investigation by differential thermal analysis, magnetic susceptibility, Mossbauer spectroscopy, electrical conductivity and thermoelectric power on single crystal Fe0.996S. There is an increase in conductivity both parallel and perpendicular to the c-axis by a factor 102 at Ta (420 K). At low temperature the I. S. is characteristic of a non-metal but i...

— We have applied the SEDM technique to study the electron hopping time at the octahedral (B) sites in magnetite. We have found that this relaxation time is either zero or less than 10" s at room temperature and 125 K. At 112 K the SEDM results for the octahedral (B) sites are quite different from those at room temperature and 125 K. Relaxation may be occurring, but in the absence of a theoreti...

The Mossbauer spectra of Fe in Fe3 _ xVx Si alloys for 0.,;; x";; I shows that V occupies almost exclusively one of two Fe sites (the B site). As x increases the spectra of Fe on the other site (the A, C site) becomes increasingly complex as the number of their V 1st neighbors increases. Simulated Mossbauer spectra were calculated using moments obtained by a simple model from bulk magnetization...

(B) Multi-elemental analysis by X-ray fluorescence. (use in Art, Archeology and environmental science)(1 week). The advent of inexpensive high-resolution X-ray spectrometers based on thermoelectrically cooled Si-PIN diodes has opened the possibility of many innovative experiments in analytical chemistry with many applications in art and archeology, environmental monitoring, nuclear medicine, to...

The effect of surface functionalization with citric acid on the properties magnetic nanoparticles (MNPs) Zn x Fe 3-x O 4 (x=0; 0.25; 0.5; 0.75; 1.0) synthesized by hydrothermal method was studied. To study MNPs, X-ray diffractometry (XRD) and energy dispersive spectroscopy (EDS) were used. samples phase state MNPs studied using a physical property measurement system (PPMS) Mossbauer (MS). It ha...