Rings in the structure of silicate glasses

Sitarz, Maciej; Mozgawa, W.; Handke, M.

doi:10.1016/s0022-2860(99)00169-6

Cited by 114 publications

(64 citation statements)

References 15 publications

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“…If the tetrahedra are connected to form hexagonal ring the ~5-4.5 Å peak dominates the intensity curve and it shifts towards smaller values for larger cluster size (Figure 7b). The position of this peak is in good agreement with the maximum of the main halo measured on the amorphous SAED patterns and supports that the scattering curve of a single ring reflects nicely the main structural feature of the amorphous regions which is consistent with interpretations of infrared spectroscopy studies (Sitarz et al 1999, Sitarz 2011. Increasing cluster size is accompanied by the enhancement of the Bragg peaks of the crystalline structure (Figure 6b).…”

Section: Accepted Manuscriptsupporting

confidence: 87%

Nanostructural investigation of slightly altered rhyolitic volcanic glass

Kis

Czigány

Németh

2017

Materials Characterization

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Silica rich volcanic glass is investigated by selected area electron diffraction (SAED) and high resolution electron microscopy (HRTEM), and nanostructural characterisation is presented. In freshly crushed glass shards the presence of amorphous and randomly oriented nanocrystalline component was detected, the latter one enriched in iron with respect to the amorphous regions. To interpret the iron containing nanocrystalline structure, model clusters of different size, shape and composition were constructed and used to calculate scattered electron intensity. According to our calculations, already a single ring of six interconnected SiO 4 tetrahedra results a separate broad peak at ~5 Å which reflects nicely the main diffraction feature of amorphous silica. Inserting two dimensional iron array between two neighbouring silica layers produces a less compact structure and the first diffraction peak shifts towards larger values with respect to the pure silica. For smaller clusters (number of atoms<250) first peak position shows a remarkable dependence on the structure and size of the cluster. The pair distribution analysis of SAED and HRTEM data indicates a certain degree of ordering with a domain size of ~2nm.

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Section: Accepted Manuscriptsupporting

confidence: 87%

Nanostructural investigation of slightly altered rhyolitic volcanic glass

Kis

Czigány

Németh

2017

Materials Characterization

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“…These bands are attributed to the Boson peak, 19) n-membered ring consisting of SiO 4 tetrahedra (n = 3, 4, 6), 20) a SiO 4 unit with two bridging oxygen atoms (i.e., Q 2 ), and a SiO 4 unit with three bridging oxygen atoms (Q 3 ), respectively. 21) As the T HT increased in the heattreated samples, sharpening of the Raman bands and shrinkage of the Boson peak were observed simultaneously, indicating the glasscrystal phase-transition, i.e., crystallization (Fig.…”

Section: ¹1mentioning

confidence: 99%

Formation of spherulite and metastable phase in stoichiometric Ba2Si3O8 glass

Takahashi

Masai

Osada

et al. 2010

J. Ceram. Soc. Japan

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We investigated the crystallization and resulting morphology of a stoichiometric barium-silicate glass Ba 2 Si 3 O 8 (B2S3) using TEM observation and Raman spectroscopy. Spherical crystal growth (i.e., spherulite) of stoichiometric B2S3 phase was observed in the heat-treated glass samples, and the size of the spherulites drastically increased as the temperature increased during the heat-treatment process. It was also found that an initial precipitating phase in the precursive stage of crystallization is neither the B2S3 phase nor other crystalline phases in the BaOSiO 2 system. It was deduced that a metastable phase precipitates prior to the formation of spherulite and acts as nucleation site for the spherulite.

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“…D 1 (480) and D 2 (600) bands are assigned to symmetric oxygen breathing vibrations of fourmembered and three-membered rings of Si-O bonds, respectively. W 1 (437) and W 3 (805) are assigned as the stretching vibration of Si-O bonds and bending vibration of Si-O-Si bonds, respectively [22]. We found that D 2 band and W 1 band of InP doped fiber shifts to lower frequency (580) and (420), respectively, which can be explained by the heavier mass of In (115) relative to Si (28) [23].…”

Section: Fiber Analysismentioning

confidence: 81%