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Titolo:
LATTICE-DYNAMICS OF ICOSAHEDRAL ALPHA-BORON UNDER PRESSURE
Autore:
VAST N; BARONI S; ZERAH G; BESSON JM; POLIAN A; GRIMSDITCH M; CHERVIN JC;
Indirizzi:
CEA,CTR ETUD LIMEIL VALENTON F-94195 VILLENEUVE ST GEO FRANCE ENS LYON,CECAM F-69007 LYON FRANCE SISSA I-34014 TRIESTE ITALY UNIV PARIS 06,CNRS,URA 782 F-75252 PARIS FRANCE ARGONNE NATL LAB ARGONNE IL 60439
Titolo Testata:
Physical review letters
fascicolo: 4, volume: 78, anno: 1997,
pagine: 693 - 696
SICI:
0031-9007(1997)78:4<693:LOIAUP>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
CARBIDE; SEMICONDUCTORS; VIBRATIONS; SOLIDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
N. Vast et al., "LATTICE-DYNAMICS OF ICOSAHEDRAL ALPHA-BORON UNDER PRESSURE", Physical review letters, 78(4), 1997, pp. 693-696

Abstract

The Raman spectrum of icosahedral alpha-boron presents a very sharp peak at 525 cm(-1) that was consistently rejected from the lattice modes but is still unexplained. New Raman scattering experiments under pressure are compared with ab initio lattice dynamics calculations. The very good agreement of the mode frequencies and their pressure coefficients yields unambiguous assignment of all observed features, includingthe 525 cm(-1) line which is a highly harmonic librational mode of the icosahedron and mainly involves bond bending. This mode is also identified in the Raman spectrum of other icosahedral boron-rich solids.

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Documento generato il 02/06/20 alle ore 01:53:42