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Titolo:
STRUCTURAL AND DYNAMICAL ASPECTS OF SOLID SULPHOLAN IN THE TEMPERATURE-RANGE 160-300 K .2. INCOHERENT QUASI-ELASTIC NEUTRON-SCATTERING STUDY
Autore:
BEE M; COMBET J; DJURADO D; CURTET JP; DIANOUX AJ;
Indirizzi:
UNIV GRENOBLE 1,SPECTROMETRIE PHYS LAB,UMR 5588,BOITE POSTALE 87,DOMAINE UNIV F-38402 ST MARTIN DHER FRANCE UNIV GRENOBLE 1,SPECTROMETRIE PHYS LAB,UMR 5588 F-38402 ST MARTIN DHER FRANCE INST MAX VON LAUE PAUL LANGEVIN F-38420 GRENOBLE 09 FRANCE
Titolo Testata:
Physica. B, Condensed matter
fascicolo: 2-3, volume: 233, anno: 1997,
pagine: 102 - 110
SICI:
0921-4526(1997)233:2-3<102:SADAOS>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
LAW; RELAXATION; DIFFUSION; CRYSTALS; PHASE;
Keywords:
INCOHERENT QUASI-ELASTIC NEUTRON SCATTERING; SULPHOLAN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
20
Recensione:
Indirizzi per estratti:
Citazione:
M. Bee et al., "STRUCTURAL AND DYNAMICAL ASPECTS OF SOLID SULPHOLAN IN THE TEMPERATURE-RANGE 160-300 K .2. INCOHERENT QUASI-ELASTIC NEUTRON-SCATTERING STUDY", Physica. B, Condensed matter, 233(2-3), 1997, pp. 102-110

Abstract

The dynamics of the sulpholan molecules in their high (I and II) and low-temperature (III and IV) phases is studied using the incoherent quasielastic neutron scattering technique (IQNS). The experiments were carried out on polycrystalline samples using the time-of-flight time-focussing neutron spectrometer IN6 at the Institut Laue-Langevin in Grenoble, with a temperature ranging from 160 to 298 K. The results are compared with the conclusions of previous NMR studies and examined in terms of several models. It is shown that on the 10(-11) s time-scale accessible to the experiment, the molecular motions in the two high-temperature phases essentially consist of a uniaxial rotation about the twofold symmetry axis. In the low-temperature phase IV no quasielastic broadening was observed. Conversely, in the other low-temperature phaseIII, restricted angular oscillations of molecules about their equilibrium positions are responsible for a distinct quasielastic broadening of the spectra, Another paper (paper I) deals with the structural aspects of the phase transitions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/07/20 alle ore 23:56:33