Magnetic susceptibility measurements have been made on multimicrogram quantities of AmF3, '4'CmF4, "'CmO2, and ' 'CmBa03 samples (nominally the 5f electronic configuration) and on ' 'CmzO&, '"'CmF3, ' BkF"and ' BkOz (nominally the 5f' electronic configuration) in the temperature range 4.2 -300 K and in magnetic fields up to 1650 G. The experimentally determined effective magnetic moments and the Curie-gneiss constants for these compounds are presented. The deviation of the moments for the 5f compounds from those expected from classic theory is discussed in terms of low-lying excited states, chemical composition, crystal-field perturbations, and realistic electronic structure.
The reported Raman spectra of the tetragonal [lead chlorofluoride-type structure, D~,,-PCl/nmm (ITC No. 129)l lanthanide oxychlorides are inconsistent. Nuclear site symmetry analysis predicts six Raman bands. Five peaks are consistently observed, whereas the sixth remains controversial. Also, two different sets of irreducible representations are reported : 2A,, + 3Eg + Bza (or B I J + 3A2, + 3E, which include the three acoustic modes, A*,{ T,} and Em{ T,, T J . The present analysis of the polarized Raman spectra from PrOCl and NdOCl single crystals clearly showed that the correct irreducible representation contains the B, symmetry. The symmetries of three Raman-active bands are weU determined, a fourth band displays two polarizations and a fifth band has no clear polarization and is assigned E, by default. The EuOCl Raman spectrum exhibits a weak electronic Raman band which originates in electron-phonon coupling as a result of the closeness between the vibrational and electronic eigenvalues. The low-energy band (LaOCI, 67 cm-'; EuOCI, 70 cm-'; and GdOC1, 65 cm-') and the high-energy band (525 cm-' for LaOCl) reported by others for selected lanthanide oxychlorides were not observed in the present work.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.