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Various Mossbauer Spectroscopy Techniques in Study of Applications Related to Nanocrystalline Iron Oxides

4 VARIOUS MOSSBAUER SPECTROSCOPY TECHNIQUES IN STUDY OF APPLICATIONS RELATED TO NANOCRYSTALLINE IRON OXIDES [Pg.378]

Transmission Mossbauer spectrometer equipped by cryomagnetic system operating with an external magnetic field upto 10T and temperatures down to 1.5 K. [Pg.378]

Schematic representations of various hyperfine interactions affecting the nuciear ieveis of a Mossbauer-active nucieus. (Adapted from Ref. 94 with permission of Cambridge University Press.) [Pg.379]

If an external magnetic field is applied to a sample and a transmission Mossbauer spectrum is recorded, we get an in-field Mossbauer spectrum. The combination of transmission Mossbauer spectroscopy and external magnetic field is then referred to as in-field (or high-field) Mossbauer spectroscopy [88-94]. [Pg.379]

It is well known that a Mossbauer-active nucleus senses its local environment via direct and indirect exchange mechanisms (see Fig. 18.28) [I 1,94]. Direct interactions include (i) interaction between atomic shell and nucleus of a Mossbauer-active atom (interaction of Type I), (ii) interaction between the nucleus of the Mossbauer-active atom and its surrounding lattice (interaction of Type III), and (Mi) interaction between Bext nd nucleus of the Mossbauer-active atom (interaction of Type V). On the other hand, indirect interactions involve (i) interaction between the lattice and atomic shell of the respective nucleus of the Mossbauer-active atom (interaction of Type II) and (ii) interaction between Bgxt and atomic shell of the respective nucleus of the Mossbauer-active atom (interaction of Type IV). Thus, Bgxt can act directly or indirectly on the nucleus of the Mossbauer-active atom and affects its nuclear levels. Beside this, Bgxt can magnetically induce a quadrupole interaction that frequently happens, for example, in the case of Fe having a cubic environment. Interaction of Type IV and Type V can be effectively described by Hamiltonians in the form of [94] [Pg.379]




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