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Titolo:
STRUCTURAL-CHANGES AND ELASTIC PROPERTIES IN AEROGELS INVESTIGATED BYBRILLOUIN-SCATTERING
Autore:
ANGLARET E; PELOUS J; HRUBESH LH;
Indirizzi:
UNIV MONTPELLIER 2,SCI MAT VITREUX LAB F-34095 MONTPELLIER FRANCE LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI LIVERMORE CA 94550
Titolo Testata:
Journal of non-crystalline solids
, volume: 186, anno: 1995,
pagine: 137 - 141
SICI:
0022-3093(1995)186:<137:SAEPIA>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
SILICA AEROGELS; DENSITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
E. Anglaret et al., "STRUCTURAL-CHANGES AND ELASTIC PROPERTIES IN AEROGELS INVESTIGATED BYBRILLOUIN-SCATTERING", Journal of non-crystalline solids, 186, 1995, pp. 137-141

Abstract

Silica aerogels with different microstructures were synthesized by one-step and two-step process. Acoustic waves in these materials were studied by Brillouin scattering. As expected, propagative phonons are observed for high-density samples. However, for some two-step samples anasymmetric profile of the Brillouin line is found which was not observed in previous investigations. This behaviour is attributed to some relaxation process coupled to the phonons. After an oxidation heat treatment these relaxations disappear. For low-density samples, the crossover to fracton modes is investigated. Values of the sound velocities, v(0), are compared for different series of samples and the data are correlated structural information.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 17:10:57