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Titolo:
PRESSURE-DEPENDENCE OF THE DYNAMICS OF AN ORGANIC INCLUSION COMPOUND INVESTIGATED BY INCOHERENT QUASI-ELASTIC NEUTRON-SCATTERING
Autore:
COMBET J; MORELON ND; FERRAND M; BEE M; DJURADO D; COMMANDEUR G; CASTEJON JM;
Indirizzi:
UNIV GRENOBLE 1,SPECTROMETRIE PHYS LAB,UMR 5588,BP 87,DOMAINE UNIV F-38402 ST MARTIN DHER FRANCE INST MAX VON LAUE PAUL LANGEVIN F-38042 GRENOBLE FRANCE
Titolo Testata:
Journal of physics. Condensed matter
fascicolo: 30, volume: 9, anno: 1997,
pagine: 403 - 409
SICI:
0953-8984(1997)9:30<403:POTDOA>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
LINEAR-CHAIN COMPOUNDS; PHASE-TRANSITIONS; TANO;
Tipo documento:
Letter
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
7
Recensione:
Indirizzi per estratti:
Citazione:
J. Combet et al., "PRESSURE-DEPENDENCE OF THE DYNAMICS OF AN ORGANIC INCLUSION COMPOUND INVESTIGATED BY INCOHERENT QUASI-ELASTIC NEUTRON-SCATTERING", Journal of physics. Condensed matter, 9(30), 1997, pp. 403-409

Abstract

The nitroxide C9H16NO2 (referred to as tano) forms channel inclusion compounds with linear hydrocarbons. At room temperature, both tano andchain molecules are dynamically disordered. When the temperature is decreased, one phase transition is observed. The pressure dependence ofthe temperature of transition and the evolution of the individual motions have been studied by incoherent quasielastic neutron scattering in the case of a tano-octane system. The transition temperature increases with the pressure with a slope (dT(t)/dP)(P=0) = 24 K kbar(-1). Thetransition mechanism is connected to the lock-in of both tano (interconversion) and chain (reorientation) molecules, as a result of strong correlations between host and guest substructures. A residual disorderpersists in the low-temperature phase confirming that all the tano molecules are not dynamically equivalent.

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Documento generato il 09/07/20 alle ore 23:04:38