Atomic structure and correlation in vitreous silica by X-ray and neutron diffraction

Henninger, E. H.; Buschert, R. C.; Heaton, L.

doi:10.1016/0022-3697(67)90309-5

Cited by 44 publications

(8 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…X-ray and neutron diffraction studies of vitreous silica [14] have clearly established that each of the first three peaks in the atomic distribution represents a single type of atom pairing: Si-O pairs with 1.6 A interatomic separation, O-O pairs at 2.6 A and Si-Si pairs at 3.1-3.2 A. This structure is consistent with the random-network theory first proposed by Zachariasen [15].…”

Section: Introductionsupporting

confidence: 86%

Extended X-ray Bremsstrahlung Isochromat Fine Structure of SiO₂

Sobczak

Nietubyć

1995

Acta Phys. Pol. A

View full text Add to dashboard Cite

X-ray bremsstrahlung isochromat of amorphous SiO2 deposited on Si crystal was measured in an energy range up to 250 eV above the threshold. Extended X-ray bremsstrahlung isochromat he structure (EXBIFS) was observed up to 150 eV for SiO2 studied. The Fourier transform of EXBIFS showed two peaks originated from first and second neighbors around silicon and oxygen ions. Model calculations of EXBIFS of amorphous SiO2 were performed in terms of single scattering of spherical waves and compared with experimental results.

show abstract

Section: Introductionsupporting

confidence: 86%

Extended X-ray Bremsstrahlung Isochromat Fine Structure of SiO₂

Sobczak

Nietubyć

1995

Acta Phys. Pol. A

View full text Add to dashboard Cite

show abstract

“…Randomly varied vacancies would also account for a loss of structure beyond 8 Å. Henninger et al (1967) also provided evidence for a structure of silica glass based on quartz. They reached their conclusions based on two independently obtained RDFs, one from X-ray-scattering data and one from neutron-scattering data.…”

Section: Quartz-based Modelsmentioning

confidence: 88%

The Structure of Silicate Melts: A Glass Perspective

Henderson

2005

The Canadian Mineralogist

126

View full text Add to dashboard Cite

Glasses are widely used as analogues for the study of silicate melts. Although they are solid materials, their structure is inherently complex and diffi cult to study. However, progress has been made in elucidating this structure, its relationship to composition, and how it behaves at high temperatures and pressures. Recent research has brought to light some new fi ndings with important implications for natural melts. These include the observation that the structure is dependent upon the type and size of alkali or alkaline-earth cations incorporated into the glass network, with Li behaving very differently than other alkali cations. In addition, the presence of more than one type of alkali cation can cause non-linear physical behavior. Elements such as Al, Ti and Fe, which play important roles in petrological phenomena, can exhibit coordination environments (e.g., 5-fold) or polyhedral arrangements (e.g., triclusters) that are not common in crystalline phases. Furthermore, polyamorphic phase-transitions may occur at high temperature and pressures; the application of new theoretical models like mean fi eld-constraint hypothesis suggests that several glass phenomena, and probably melt phenomena as well, may be related to stress-rigid to fl oppy transitions. The state of understanding of glass structure, although still rudimentary relative to crystalline materials, has grown exponentially over the last few decades, often with geological researchers at the forefront.Keywords: melts, structure, glasses, petrology, spectroscopy, behavior, model. SOMMAIREOn se sert couramment des verres pour étudier les bains fondus silicatés. Quoiqu'ils sont des matériaux solides, leur structure est naturellement complexe et diffi cile à étudier. Toutefois, des progrès ont été faits dans l'étude de cette structure, sa relation à la composition, et son comportement à températures et pressions élevées. Les projets de recherche récents font ressortir les implications importantes aux bains fondus naturels. A titre d'exemple, la structure dépendrait de la sorte et la taille d'ion alcalin ou alcalino-terreux qui se trouve incorporé dans le réseau du verre. Le Li se comporte de façon très différente des autres alcalins. De plus, la présence de plus d'une sorte d'alcalin peut causer des comportements physiques non-linéaires. Les élements tels Al, Ti et Fe, dont l'importance pétrologique est évidente, peuvent adopter une coordinence inhabituelle, cinq par exemple, et un arrangement polyédrique, des groupements par trois, par exemple, qui ne sont pas communs dans les phases cristallines. De plus, des transitions de phases polyamorphiques pourraient avoir lieu à températures et à pressions élevées. L'application de nouveaux modèles théoriques, par exemple le modèle de contrainte moyenne du champ, fait penser que plusieurs phénomènes impliquant les verres, et tout probablement les bains fondus, pourraient résulter de transitions de matériau rigide face aux contraintes à maté-riau déformable. Quoique les connaissances de la structure du ve...

show abstract

“…The corrected and scaled X-ray intensity spectra of pyrolytic and sputtered oxides compared with that of fused silica, taken from [8], are shown in Fig. 1.…”

Section: Resultsmentioning

confidence: 99%

Structure of pyrolytic and sputtered SiO2 films by X-ray Fourier analysis

Lin¹

1970

Phys. Stat. Sol. (a)

View full text Add to dashboard Cite

Structures of pyrolytic and sputtered SiO2 films have been obtained by X‐ray Fourier analysis method. The electron radial distribution function was calculated from experimental X‐ray spectra. Both pyrolytic and sputtered SiO2 films have slightly oxygen deficient SiO4 tetrahedral structures. Sputtered SiO2 has a structure more similar to that of fused silica than pyrolytic oxide. The pyrolytic SiO2 consists of SiO4 tetrahedral units randomly stacked and packed. The SiOSi angles are distributed in such a way in the pyrolytic oxide that no ordering exists beyond a given tetrahedral unit, i.e. ≈︁ 3 Å. Therefore, pyrolytic oxide has a less compact structure or lower specific density, a larger amount of vacancies and pinholes, and, consequently, higher susceptibility to water absorption and higher etching rate than fused silica or sputtered SiO2.

show abstract

Atomic structure and correlation in vitreous silica by X-ray and neutron diffraction

Cited by 44 publications

References 11 publications

Extended X-ray Bremsstrahlung Isochromat Fine Structure of SiO₂

Extended X-ray Bremsstrahlung Isochromat Fine Structure of SiO₂

The Structure of Silicate Melts: A Glass Perspective

Structure of pyrolytic and sputtered SiO2 films by X-ray Fourier analysis

Contact Info

Product

Resources

About

Atomic structure and correlation in vitreous silica by X-ray and neutron diffraction

Cited by 44 publications

References 11 publications

Extended X-ray Bremsstrahlung Isochromat Fine Structure of SiO2

Extended X-ray Bremsstrahlung Isochromat Fine Structure of SiO2

The Structure of Silicate Melts: A Glass Perspective

Structure of pyrolytic and sputtered SiO2 films by X-ray Fourier analysis

Contact Info

Product

Resources

About

Extended X-ray Bremsstrahlung Isochromat Fine Structure of SiO₂

Extended X-ray Bremsstrahlung Isochromat Fine Structure of SiO₂