LOW-FREQUENCY VIBRATIONAL-STATES IN SPECTROSIL-WF

被引：13

作者：

AHMAD, N

机构：

[1] Centre for Nuclear Studies, Islamabad, P.O. Nilore

来源：

PHYSICAL REVIEW B | 1993年 / 48卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.48.13512

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The heat capacity of Spectrosil-WF (vitreous silica containing < 20 ppm of OH) in the temperature range from 2 to 16 K as well as the Raman measurements are presented. The heat capacity is similar to that of Spectrosil-B (vitreous silica containing 1200 ppm of OH) but is about 20% higher than the Heralux (vitreous silica containing 130-180 ppm of OH). The density of low-frequency vibrational states, g (nu), has been determined. It has been found that the form of g (nu) is nonquadratic, which can be explained on the basis of a soft-potential model. About 110 atoms participate in a soft mode. The Raman and infrared coupling constants have similar dependence on frequency. These are explained on the basis of a single-coupling-constant bond model. It is found that the form of the Raman coupling constant cannot be explained on the basis of Martin-Brenig theory.

引用

页码：13512 / 13517

页数：6

共 37 条

[11] SOFT LOCALIZED VIBRATIONS IN GLASSES AND UNDERCOOLED LIQUIDS [J].

BUCHENAU, U .

PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES, 1992, 65 (02) :303-315

[12] INTERACTION OF SOFT MODES AND SOUND-WAVES IN GLASSES [J].

BUCHENAU, U ;

GALPERIN, YM ;

GUREVICH, VL ;

PARSHIN, DA ;

RAMOS, MA ;

SCHOBER, HR .

PHYSICAL REVIEW B, 1992, 46 (05) :2798-2808

[13] 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

[14] LOW-FREQUENCY MODES IN VITREOUS SILICA [J].

BUCHENAU, U ;

PRAGER, M ;

NUCKER, N ;

DIANOUX, AJ ;

AHMAD, N ;

PHILLIPS, WA .

PHYSICAL REVIEW B, 1986, 34 (08) :5665-5673

[15] A SILICON ON SAPPHIRE THERMOMETER FOR SMALL SAMPLE LOW-TEMPERATURE CALORIMETRY [J].

EARLY, SR ;

HELLMAN, F ;

MARSHALL, J ;

GEBALLE, TH .

PHYSICA B & C, 1981, 107 (1-3) :327-328

[16] THE LOW-TEMPERATURE HEAT CAPACITY AND THE RAMAN AND BRILLOUIN SPECTRA OF VITREOUS SILICA [J].

FLUBACHER, P ;

LEADBETTER, AJ ;

MORRISON, JA ;

STOICHEFF, BP .

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1959, 12 (01) :53-&

[17] LOCALIZED STATES IN GLASSES [J].

GALPERIN, YM ;

KARPOV, VG ;

KOZUB, VI .

ADVANCES IN PHYSICS, 1989, 38 (06) :669-737

[18] LOW-TEMPERATURE SPECIFIC-HEAT AND THERMAL-CONDUCTIVITY OF GLASSES [J].

GIL, L ;

RAMOS, MA ;

BRINGER, A ;

BUCHENAU, U .

PHYSICAL REVIEW LETTERS, 1993, 70 (02) :182-185

[19] MODELING A TUNNELING STATE IN AMORPHOUS-SILICON DIOXIDE [J].

GUTTMAN, L ;

RAHMAN, SM .

PHYSICAL REVIEW B, 1986, 33 (02) :1506-1508

[20]

HUTT KW, 1986, THESIS U CAMBRIDGE

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