Phase separation in glasses

Kreidl, Norbert J.

doi:10.1016/0022-3093(91)90074-g

Cited by 36 publications

(19 citation statements)

References 54 publications

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“…In G1.00, both Si and Al phase separation are observable to greater extent. It has been reported that Mg shows higher phase separation tendencies than Na in silicate systems (Galakhov and Varshal, 1973;Kreidl, 1991;Hudon and Baker, 2002). This can explain the phase separation observed in compositions close to magnesium endmember.…”

Section: Understanding Phase Separation In Glasses Through Semmentioning

confidence: 80%

Field Strength of Network-Modifying Cation Dictates the Structure of (Na-Mg) Aluminosilicate Glasses

et al. 2020

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Aluminosilicate glasses are materials with a wide range of technological applications. The field strength of network-modifying cations strongly influences the structure of aluminosilicate glasses and their suitability for various applications. In this work, we study the influence of the field strength of network-modifying cations on the structure of [(Na 2 O) 1−x (MgO) x (Al 2 O 3) 0. 25 (SiO 2) 1. 25 ] glasses. Due to the higher cation field strength of magnesium than sodium, magnesium prefers the role of network modifier, while sodium preferentially acts as a charge compensator. When magnesium replaces sodium as network modifier, Q 3 silicon species are converted into Q 2 species. The replacement of sodium with magnesium as charge compensator leads to the following changes: (1) the proportion of aluminum-rich Q 4 species [Q 4 (4Al) and Q 4 (3Al)] decreases, while the proportion of aluminum-deficient Q 4 species [Q 4 (2Al) and Q 4 (1Al)] increases; and (2) there is an increased tendency for phase separation between silica-rich and alumina-rich glasses.

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Section: Understanding Phase Separation In Glasses Through Semmentioning

confidence: 80%

Field Strength of Network-Modifying Cation Dictates the Structure of (Na-Mg) Aluminosilicate Glasses

et al. 2020

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“…This structure may be considered as the result of sputtering away overlying layers that contained ultra-fine clay platelets ( N 0.2 pm) aligned parallel to the surface and fused together during firing. Some other causes for this effect may be tentatively put forward, such as a phenomenon of liquid to liquid phase separation (Mazurin and Streltsina 1972;Kreidl 1991) during cooling, unless it is the result of corrosion, but even then the selectivity would mean materials of different resistance. However, given that this latter phenomenon is not fully understood yet, we emphasize the first and most obvious assumption of the overlying aligned particles for the characteristic appearance of this glassy film.…”

Section: Concentration Of Major and Minor Elements Expressed As % Oximentioning

confidence: 99%

New Evidence for the Nature of the Attic Black Gloss

1993

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New evidence is reported here using transmission electron microscopy, scanning electron microscopy, and laser reflectance for the nature of the black glossy decoration layer present on the Attic black or red figure vases of the sixth to fourth century BC. The black layer, of total thickness about 20 μm, consists mainly of poly crystalline magnetite (Fe3O4) particles of dimensions from 0.2 μm down to extremely fine sizes embodied in an amorphous vitreous matrix. On the outer surface of the black paint we discovered for the first time a thin clear glassy film of approximate thickness 0.1 μm which is rich in Al and Fe and poor in Si. This film must be responsible for the characteristic sheen of the surface. This is verified with the reflection of laser light mostly in specular direction, a unique property compared with black paints of other areas and other periods.

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“…This separation is generated by the tendency of the glass former ions (Si 4+ , B 3+ , Fe 3+ , and Al 3+ ) to occupy preferred sites or coordination numbers. The addition of glass modifiers expands the fabrication flexibility of the glass-ceramics [1,2] by controlling the conversion from trigonal [BO 3 ] to tetrahedral [BO 4 ] coordination in silica base glass. However, despite the wide compositional possibilities, only a few types of magnetic glass-ceramics with silicate or borosilicate glass parent were reported.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of glass-ceramics obtained by crystallization of iron-rich borosilicate glasses

et al. 2017

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Abstract:The specific dynamic magnetic response and magnetic relaxation phenomena in magnetite-based glass-ceramics by controlled crystallization of Fe-rich borosilicate glasses with 25 wt% Fe 2 O 3 , in the presence of two types of nucleating agents, Cr 2 O 3 and P 2 O 5 , were investigated. The magnetic response is complex and shows contributions arising from two subsystems: a system with collective characteristics, superspin-glass like, and another one with single particle characteristics (superparamagnetic) with dipolar interaction. The nucleating agents have strong influence on the characteristic temperatures and anisotropy energy.

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Phase separation in glasses

Cited by 36 publications

References 54 publications

Field Strength of Network-Modifying Cation Dictates the Structure of (Na-Mg) Aluminosilicate Glasses

Field Strength of Network-Modifying Cation Dictates the Structure of (Na-Mg) Aluminosilicate Glasses

New Evidence for the Nature of the Attic Black Gloss

Magnetic properties of glass-ceramics obtained by crystallization of iron-rich borosilicate glasses

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