EPR studies of Rh/sup 0/ and Rh(II) centers stabilized in NH/sub 4/Cl single crystals
Journal Article
·
· J. Chem. Phys.; (United States)
OSTI ID:6861549
The electron paramagnetic resonance (EPR) studies of gamma irradiated ammonium chloride single crystals doped with rhodium have given evidence to suggest the stabilization of Rh/sup 0/ and Rh(II) at interstitial sites in a compressed octahedral coordination with D/sub 4h/ symmetry. The EPR spectrum of Rh/sup 0/ has been found to be highly temperature dependent, the intensity increasing with the lowering of temperature and was observable only below -100 /sup 0/C. Well resolved hyperfine structure due to /sup 103/Rh has been observed for Rh/sup 0/ center. Its g values suggest that the unpaired electron is in a pure approx. =/sup 2/-r/sup 2/> orbital, in contrast to the xi/sup 2/-y/sup 2/> character of the unpaired electron of Rh(II) center. At 77 /sup 0/K superhyperfine structure due to four equivalent chlorines was observed in the EPR spectrum of Rh(II) center, indicating the overlap of xi/sup 2/-y/sup 2/> orbital with the equatorial ligands.
- Research Organization:
- Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Bombay 400085, India
- OSTI ID:
- 6861549
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 73:11; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ALLOYS
AMMONIUM CHLORIDES
AMMONIUM COMPOUNDS
AMMONIUM HALIDES
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
ELECTROMAGNETIC RADIATION
ELECTRON SPIN RESONANCE
GAMMA RADIATION
HALIDES
HALOGEN COMPOUNDS
HYPERFINE STRUCTURE
INTERSTITIALS
IONIZING RADIATIONS
MAGNETIC RESONANCE
MONOCRYSTALS
PLATINUM METAL ALLOYS
POINT DEFECTS
RADIATION CHEMISTRY
RADIATIONS
RESONANCE
RHODIUM ADDITIONS
RHODIUM ALLOYS
TEMPERATURE DEPENDENCE
400600* -- Radiation Chemistry
ALLOYS
AMMONIUM CHLORIDES
AMMONIUM COMPOUNDS
AMMONIUM HALIDES
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
ELECTROMAGNETIC RADIATION
ELECTRON SPIN RESONANCE
GAMMA RADIATION
HALIDES
HALOGEN COMPOUNDS
HYPERFINE STRUCTURE
INTERSTITIALS
IONIZING RADIATIONS
MAGNETIC RESONANCE
MONOCRYSTALS
PLATINUM METAL ALLOYS
POINT DEFECTS
RADIATION CHEMISTRY
RADIATIONS
RESONANCE
RHODIUM ADDITIONS
RHODIUM ALLOYS
TEMPERATURE DEPENDENCE