without, morphé, shape, form) or non-crystalline solid isa solid that lacks the long-range order that is characteristic of a crystal. In some older books, the term has been used synonymously with glass. ... Polymers are often amorphous. ...
Amorphous glasses, including fused silica, can be etched in a similar way to SC quartz. Examples are the isotropic etching of borosilicate glass in HF acid, in which a strip-opening in the masking layer will result in a hemispherical channel structure if sufficient etch time is allowed.Fig. ...
Usually, when we think of a solid, we actually mean a crystalline material — something like salt, which has a regular and ordered structure. Below the melting point, this solid crystalline structure is the most stable form, and above the melting point, the liquid form becomes more stable. ...
During the process of heating, some solid gets melted and if quench cooled, instead of crystallizing, gets converted to amorphous solid form appearing as that of glass. This glass formation is seen because of the dynamic arrest of molecules forming a disordered state at Tg. The molecules/atoms...
Mullite is a compound consisting of alumina (aluminum oxide) and silica (silicon dioxide). Cristobalite is a form of silica (silicon dioxide). The mullite/cristobalite (white) and glass (gray) phases are clearly seen in Figure 4-17(d) and are designated by 2a and 2b, respectively. Also ...
The crystallized glass is made from a glass material of a Li 2 O--SiO 2 , Li 2 O--Al 2 O 3 --SiO 2 , Li 2 O--MgO--Al 2 O 3 --SiO 2 , MgO--Al 2 O 3 --SiO 2 , Na 2 O--Al 2 O 3 --SiO 2 or BaO--Al 2 O 3 --SiO 2 system, and the crystal particles ...
For clarity, the quenched product from 130 °C (stable phase I, over Tm), a transparent solid without any Bragg diffraction, is denoted as agZW-UiO-67·MSA (ag means amorphous-glass) for further discussion. The SEM image of the surface of agZW-UiO-67·MSA displays a smooth and crac...
Fibreglass, fibrous form of glass that is used principally as insulation and as a reinforcing agent in plastics. Glass fibres were little more than a novelty until the 1930s, when their thermal and electrical insulating properties were appreciated and me
1d), and a total structure function S(Q) (as-prepared curve in Fig. 1e) of MGs with no sharp Bragg diffraction pattern. The amorphous structure is also confirmed by the high-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) results (Fig. 1f, ...
Typically, the glass particle is purely amorphous (Figure 2) [38,45]. The high amount of amorphous SiO2 makes glass suitable for use as a pozzolanic material in concrete. The other components, such as CaO and Al2O3, enhance the reactivity and hydration of glass powder; consequently, a ...