Early stages of nucleation of Zerodur glass

Small-angle X-ray scattering and low-frequency Raman scattering study of liquid phase separation and crystallization in titania-containing glasses of the ZnO–Al2O3–SiO2 System

“…2 There is some discrepancy of the position of low-frequency Raman band in Table 1 and in Fig. 5 because the corresponding samples were prepared upon heat-treatment of initial glasses with different thermal prehistory.…”

“…The estimation of the velocity of sound in amorphous regions of inhomogeneity as the average of velocities of sound for oxides forming those regions is less strict. Such rough Table 1 Sizes of amorphous and crystalline regions of inhomogeneity in glass and glass-ceramics of composition III-9TiO 2 Heat-treatment schedule: We show integral intensity of low-frequency Raman band, measured in respect to intensity in the maximum of the band of silicate matrix,…”

“…The sizes of precipitated amorphous inhomogeneities estimated by low-frequency Raman scattering and SAXS methods, relative intensities of low-frequency Raman scattering band and of Raman band at $660 cm À1 , characteristic of spinel, as well as sizes of spinel crystals and fraction of spinel crystallinity according to XRD data are shown in Table 1. 2 With increasing the heat-treatment temperature the sizes of inhomogeneous regions determined by two different methods, Raman scattering and small-angle X-ray scattering, behave similarly. Firstly they change a little, and increase only when the heat-treatment temperature reaches 950°C (see Table 1).…”

“…At study of phase transformations in glasses, along with X-ray diffraction methods (small-angle X-ray scattering, SAXS, and X-ray diffraction analysis, XRD) traditional Raman spectroscopy in combination with low-frequency Raman spectroscopy gives abundant information about compositions, structure and amounts of precipitated phases, about sizes of corresponding nanometer sized inhomogeneous regions and interaction on the interface between inhomogeneous regions and surrounding glass phase [1][2][3][4][5][6][7][8][9][10]. Previously we used those techniques for the study of glasses of lithium and magnesium aluminosilicate systems nucleated by TiO 2 [3,9,10], ZrO 2 [6] or both oxides altogether [7].…”

Influence of Alteration Solutions on the Chemical Durability of the Zerodur® Glass‐Ceramic: Structural Investigation

“…), the crystalline phase has been identified as (Li, Mg, Zn) 1.7 Al 2 Si 6 O 16 [PDF 00‐053‐1277], which crystallizes in a hexagonal system (P6222 space group) . At 31°, a large and small line is observed and attributed to the ZrTiO 4 crystallites, which constitute the heterogeneous nuclei for the solid solution . The mean matrix composition (for major oxides) according to EDX analysis is given in the Table .…”