ABSORPTION SPECTROPHOTOMETRIC STUDIES OF SOME LANTHANIDE AND ACTINIDE HALIDES UNDER PRESSURE
Diamond anvil cells have been used for absorption spectrophotometric studies of lanthanide and actinide halides over a pressure range of 10**-4 to >30 GPa. Irreversible spectral changes with pressure in AmI-3 and CfBr-3 have previously been correlated with structural transformations to a more dense form of both compounds. Reversible spectral changes with pressure are more difficult to interpret. In NdCl-3 the spectral changes as pressure is increased suggest the formation of a phase of higher symmetry. With compression of AmCl-3, the spectral changes observed are more subtle. CfCl-3 retains its hexagonal structure at pressure up to 30 GPa. Other studies of Cf(III) chlorides have indicated the formation of a new compound, as yet unidentified, whose spectra as a function of pressure also exhibit reversible changes. Complementary X-ray diffraction data, presently lacking, would help elucidate these phenomena.
Bibliographic Reference: 2ND WORKSHOP ON "ACTINIDES UNDER PRESSURE", KARLSRUHE (GERMANY), JUNE 2-3, 1986 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 33080 ORA
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Record Number: 1989125033700 / Last updated on: 1987-03-01
Available languages: en