MAGNETIC RESONANCE OF METALS AND PARAMAGNETIC IONS IN SOLUTION (thesis)

Technical Report · Wed Dec 13 04:00:00 EST 1961

OSTI ID:4786846

Brown, J

Several methods of conducting electron spin resonance experiments to 600 deg C are described. The system lithium in lithium iodide was studied to observe the resonance of lithium metal dissolved in molten lithium iodide. No resonance was observed, from which it is deduced that T/sub 2/ < 2 x 10/sup -10/ sec. The relaxation times and g values of lithium metal in lithium iodide were measured at temperatures below the lithium iodide melting point. The was no variation of g value, but the relaxation time at 425 deg C is greater than its room-temperature value by approximately 20%. The line shape was found to vary with temperature and to depend on sample treatment prior to measurement. Electron spin resonance measurements of the line width of ultraviolet-irradiated lithium hydride at temperatures greater than 25 deg C were made to test the hypothesis that the line arises from colloidal lithium metal. The intensity of the line was drastically reduced at 95 deg C, and the line had disappeared completely at 170 deg C. Electron spin resonance studies were conducted from 25 to 500 deg C on the systems MnCl/sub 2/, MnCl/sub 2/ - 4H/sub 2/O, MnCl/sub 2/ ZnCl/sub 2/ MnCl/sub 2/ in LiCl-KCl CrCl/sub 3/, CrCl/sub 3/ in ZnCl/sub 2/, CrCl/sub 3/ in LiCl-KCl, NiCl/sub 2/ in LiCl KCl, FeCl/sub 3/, FeCl/sub 3/ in LiCl--KCl, and VOCl/sub 2/ in LiCl-KCl. In the solutions resonances were observed only in Mn(II) and Cr(III). For Mn(II) solutions the line width/decreases with increasing temperature and increasing concentration. The concentration effect is from exchange narrowing, and it is shown that the exchange phenomenon is still significant at a concentration of 0.3 M. The results in Mn(II) solutions are compared with several theories of relaxation in liquids, with poor agreement. No variation of line width with temperature was observed in solutions of Cr(III). In addition, the line width was found to be the same for the Cr(III) solutions as for the mixed powders of the same concentration. Some interesting temperature effects encountered in the solids are reported (auth)

• Research Organization: California. Univ., Berkeley. Lawrence Radiation Lab.
• DOE Contract Number: W-7405-ENG-48
• NSA Number: NSA-16-013018
• OSTI ID: 4786846
• Report Number(s): UCRL-9944
• Country of Publication: United States
• Language: English

Related Subjects

CHEMISTRY
CHLORIDES
CHROMIUM CHLORIDES
COLLOIDS
DEFORMATION
ELECTRONS
FUSED SALTS
HIGH TEMPERATURE
IONS
IRON CHLORIDES
LIQUIDS
LITHIUM
LITHIUM HYDRIDES
LITHIUM IODIDES
MAGNETIC RESONANCE
MAGNETISM
MANGANESE CHLORIDES
MELTING POINTS
NICKEL CHLORIDES
OXYCHLORIDES
PARAMAGNETISM
POTASSIUM CHLORIDES
RELAXATION
SALTS
SOLIDS
SPIN
ULTRAVIOLET RADIATION
VANADIUM CHLORIDES
WATER
ZINC CHLORIDES