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Raman spectra of molecular crystals at high pressures: VII—Boron Triiodide
Author(s) -
Anderson A.,
Lettress Lauren
Publication year - 2002
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.821
Subject(s) - raman spectroscopy , intermolecular force , boron , ambient pressure , triiodide , chemistry , spectral line , crystal (programming language) , wavenumber , crystallography , phase transition , analytical chemistry (journal) , molecule , thermodynamics , optics , organic chemistry , physics , electrode , astronomy , dye sensitized solar cell , computer science , electrolyte , programming language
Raman spectra of solid boron triiodide, BI 3 , at ambient temperature and at pressures up to 5 GPa are reported. Because of drastic but reversible colour changes to the samples and subsequent absorption, measurements at higher pressures were not possible. Four fundamental peaks, assigned as translational, librational, bending and stretching modes, were tracked as a function of pressure. The spectra evolve smoothly and there is no evidence of any structural phase transitions or major molecular distortions in this pressure range. All modes show increases in wavenumber with pressure, with that for the two lattice modes being most pronounced. The initially ‘soft’ crystal at ambient pressure stiffens appreciably, with an approximately fourfold increase in intermolecular bonding at 5 GPa. Copyright © 2002 John Wiley & Sons, Ltd.