ORIGIN OF THE RAMAN BANDS, D1 AND D2, IN HIGH SURFACE-AREA AND VITREOUS SILICAS

被引:81
作者
HUMBERT, B [1 ]
BURNEAU, A [1 ]
GALLAS, JP [1 ]
LAVALLEY, JC [1 ]
机构
[1] UNIV CAEN,ISMRA,URA 04414,F-14050 CAEN,FRANCE
关键词
D O I
10.1016/S0022-3093(05)80555-1
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The Raman bands of silicas at 491 and 607 cm-1, observed for high surface area and vitreous samples and usually ascribed, respectively, to defects D1 and D2, are discussed by comparison with infrared spectra. On the basis of rehydration experiments of silica powders, the D1 band is assigned to a vibrational mode of [SiO4] tetrahedra with a non-bridging oxygen atom. The structure giving band D2 is related to the surface condensation, between 200 and 550-degrees-C, of two weakly interacting silanols which absorb in the 3600-3680 cm-1 range. The condensation, described in a model based on the true beta-cristobalite structure, generates a (SiO)3 ring D2 and a free silanol which appears in the infrared spectra at about 3740 cm-1. Mechanisms of formation of D1 and D2 in vitreous silica are suggested in agreement with previous experiments.
引用
收藏
页码:75 / 83
页数:9
相关论文
共 39 条
  • [1] VIBRATIONS OF FRACTALS AND SCATTERING OF LIGHT FROM AEROGELS
    ALEXANDER, S
    [J]. PHYSICAL REVIEW B, 1989, 40 (11): : 7953 - 7965
  • [2] BARRES O, 1990, THESIS U NANCY 1
  • [3] NEUTRON-IRRADIATION EFFECTS AND STRUCTURE OF NONCRYSTALLINE SIO2
    BATES, JB
    HENDRICKS, RW
    SHAFFER, LB
    [J]. JOURNAL OF CHEMICAL PHYSICS, 1974, 61 (10) : 4163 - 4176
  • [4] RAMAN SPECTRA OF ALPHA-CRISTOBALITE AND BETA-CRISTOBALITE
    BATES, JB
    [J]. JOURNAL OF CHEMICAL PHYSICS, 1972, 57 (09) : 4042 - +
  • [5] RAMAN DEFECT PEAKS IN THE SPECTRA OF NA2O SILICA-GELS EVOLVING TOWARD GLASS
    BERTOLUZZA, A
    FAGNANO, C
    MORELLI, MA
    GOTTARDI, V
    GUGLIELMI, M
    [J]. JOURNAL OF NON-CRYSTALLINE SOLIDS, 1986, 82 (1-3) : 127 - 136
  • [6] LOW-FREQUENCY RAMAN-SCATTERING FROM FRACTAL VIBRATIONAL-MODES IN A SILICA-GEL
    BOUKENTER, A
    CHAMPAGNON, B
    DUVAL, E
    DUMAS, J
    QUINSON, JF
    SERUGHETTI, J
    [J]. PHYSICAL REVIEW LETTERS, 1986, 57 (19) : 2391 - 2394
  • [7] SURFACE-STRUCTURE AND CHEMISTRY OF HIGH SURFACE-AREA SILICA-GELS
    BRINKER, CJ
    BROW, RK
    TALLANT, DR
    KIRKPATRICK, RJ
    [J]. JOURNAL OF NON-CRYSTALLINE SOLIDS, 1990, 120 (1-3) : 26 - 33
  • [8] SOL-GEL TRANSITION IN SIMPLE SILICATES .3. STRUCTURAL STUDIES DURING DENSIFICATION
    BRINKER, CJ
    TALLANT, DR
    ROTH, EP
    ASHLEY, CS
    [J]. JOURNAL OF NON-CRYSTALLINE SOLIDS, 1986, 82 (1-3) : 117 - 126
  • [9] NMR CONFIRMATION OF STRAINED DEFECTS IN AMORPHOUS SILICA
    BRINKER, CJ
    KIRKPATRICK, RJ
    TALLANT, DR
    BUNKER, BC
    MONTEZ, B
    [J]. JOURNAL OF NON-CRYSTALLINE SOLIDS, 1988, 99 (2-3) : 418 - 428
  • [10] COMPARATIVE-STUDY OF THE SURFACE HYDROXYL-GROUPS OF FUMED AND PRECIPITATED SILICAS .3. DRIFT CHARACTERIZATION OF GRAFTED N-HEXADECYL CHAINS
    BURNEAU, A
    BARRES, O
    VIDAL, A
    BALARD, H
    LIGNER, G
    PAPIRER, E
    [J]. LANGMUIR, 1990, 6 (08) : 1389 - 1395