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The Effect of Pressure on the Raman and Absorption Spectra of PrCl3, PrBr3, and NdBr3

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Abstract:

Solid-state absorption and Raman phonon spectroscopic investigations of PrCl3, PrBr3, and NdBr3 under high pressure have been carried out at room temperature. These studies showed that the UCl3-type hexagonal form of PrCl3 and PrBr3 converts with the application of pressure to the PuBr3-type orthorhombic crystal structure. The absorption and Raman spectra obtained from PrBr3 and NdBr3 at pressures above ~260 kbar exhibit differences from spectra obtained at lower pressures, where they exhibit the PuBr3-type orthorhombic structure. These spectral differences suggest that a phase transformation might have taken place to an as-yet-unidentified crystal structure.

Keywords: Absorption spectra; Crystal structure; Lanthanide trihalides; Pressure effects; Raman spectra

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702894204038

Affiliations: 1: Chemistry Department, University of Tennessee, Knoxville, Tennessee 37996-1600 2: Transuranium Research Laboratory (Chemistry Division), Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6375 3: Chemistry Department, University of Tennessee, Knoxville, Tennessee 37996-1600; Transuranium Research Laboratory (Chemistry Division), Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6375

Publication date: August 1, 1989

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