LOW-FREQUENCY VIBRATIONAL-MODES RELATED TO TEXTURE IN SILICA AEROGELS

被引：12

作者：

PELOUS, J ^{[1
]}

SAUVAJOL, JL ^{[1
]}

WOIGNIER, T ^{[1
]}

VACHER, R ^{[1
]}

机构：

[1] GRP DYNAM PHASES CONDENSEES,CNRS,UA233,F-34060 MONTPELLIER 01,FRANCE

来源：

JOURNAL DE PHYSIQUE | 1990年 / 51卷 / 05期

关键词：

D O I：

10.1051/jphys:01990005105043300

中图分类号：

学科分类号：

摘要：

Low frequency vibrational modes of silica aerogels have been investigated by Raman spectrometry. The position and lineshape of the peaks observed in the range from 5 to 30 cm-1 appear correlated to the initial preparation conditions and to the heat treatment responsible for the densification. The maximum frequency of the peak is proportional to the inverse of the constitutive particle gyration radius deduced from small angle neutron scattering. This gives a determination of the sound velocity inside these particles. Moreover, the temperature dependence of the spectrum for one sample demonstrates the harmonic character of the modes responsible for the peak.

引用

页码：433 / 441

页数：9

共 37 条

[1] RELAXATION AND NONRADIATIVE DECAY IN DISORDERED-SYSTEMS .1. ONE-FRACTON EMISSION [J].

ALEXANDER, S ;

ENTINWOHLMAN, O ;

ORBACH, R .

PHYSICAL REVIEW B, 1985, 32 (10) :6447-6455

[2]

ALEXANDER S, 1982, J PHYS LETT-PARIS, V43, pL625, DOI 10.1051/jphyslet:019820043017062500

[3] FRACTION INTERPRETATION OF VIBRATIONAL PROPERTIES OF CROSS-LINKED POLYMERS, GLASSES, AND IRRADIATED QUARTZ [J].

ALEXANDER, S ;

LAERMANS, C ;

ORBACH, R ;

ROSENBERG, HM .

PHYSICAL REVIEW B, 1983, 28 (08) :4615-4619

[4]

Anderson A. C., 1986, PHONON SCATTERING CO

[5] ANOMALOUS LOW-TEMPERATURE THERMAL PROPERTIES OF GLASSES AND SPIN GLASSES [J].

ANDERSON, PW ;

HALPERIN, BI ;

VARMA, CM .

PHILOSOPHICAL MAGAZINE, 1972, 25 (01) :1-&

[6]

[Anonymous], 1979, CHEM SILICA

[7] VIBRATIONAL-MODES IN SILICA AEROGELS - LOW-FREQUENCY RAMAN-SCATTERING [J].

BOUKENTER, A ;

CHAMPAGNON, B ;

DUVAL, E ;

ROUSSET, JL ;

DUMAS, J ;

SERUGHETTI, J .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1988, 21 (34) :L1097-L1102

[8] LOW-FREQUENCY RAMAN-SCATTERING FROM FRACTAL VIBRATIONAL-MODES IN A SILICA-GEL [J].

BOUKENTER, A ;

CHAMPAGNON, B ;

DUVAL, E ;

DUMAS, J ;

QUINSON, JF ;

SERUGHETTI, J .

PHYSICAL REVIEW LETTERS, 1986, 57 (19) :2391-2394

[9] LOW-DENSITY SILICA AEROGELS OBSERVED BY HIGH-RESOLUTION ELECTRON-MICROSCOPY [J].

BOURRET, A .

EUROPHYSICS LETTERS, 1988, 6 (08) :731-737

[10] NEUTRON-SCATTERING STUDY OF THE LOW-FREQUENCY VIBRATIONS IN VITREOUS SILICA [J].

BUCHENAU, U ;

NUCKER, N ;

DIANOUX, AJ .

PHYSICAL REVIEW LETTERS, 1984, 53 (24) :2316-2319

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