Surface Crystallization of Cordierite from Glass Studied by High-Temperature X-ray Diffraction and Electron Backscatter Diffraction (EBSD)

Analysis of the cordierite X-phase and phase transformation by electron backscatter diffraction (EBSD)

“…[7][8][9][10]. The recent application of electron backscatter diffraction (EBSD) to the surface crystallization of cordierite [11,12] has confirmed some previous results such as statistical crystal nucleation at the surface and a glass skin covering these topmost crystals [13,14]. Some new insights into local orientations and orientation development during growth were also provided.…”

“…The regular and elongated hexagons are μ-cordierite, confirmed by EBSD-measurements [11], and very similar to the squares and spheres [15]. Small, lozenge shaped crystals denoted as the metastable "X-phase" [14,15,[17][18][19][20][21][22][23] have not been analyzed by EBSD so far.…”

“…Some new insights into local orientations and orientation development during growth were also provided. For example the crystals shaped as hexagons [15,16] were shown to deviate from the orientation their geometrical shape implies by more than 30° [11].…”

“…Nucleation rates in cordierite glass additionally depend on the polishing agent [17][18][19][20][21] and even the position of the sample in the furnace [18,19]. Hence it has been proposed to reproduce the results of the stoichiometric melt [11] on the GM 30870 melt produced by the SCHOTT AG (W. Pannhorst) which was used for many independent experiments throughout the world.…”

“…[11] on the GM 30870 melt and apply EBSD to X-phase containing samples. Additionally, samples crystallized in 1995 are analyzed with respect to possible phase transformations at room temperature after more than 15 years.…”