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Crystallization of 60SiO2–20MgO–10Al2O3–10BaO Glass Ceramics

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Three distinctly different microstructures of silica (as quartz and crystobalite), alumina, enstatite, and celsian, were found to develop in a 60SiO2–20MgO–10Al2O3–10BaO glass ceramic. At 1010°C, growth of wormy fibrillar crystals was observed, indicating that crystal growth was diffusion controlled. At the intermediate temperature of 1080°C, a coarse cellular microstructure developed with multiple spherical particles nucleated on their surfaces and in the surrounding glass. At 1200°C, the glass crystallizes in a denderitic morphology but the dendrites were actually fragmented into multiple cube-shaped enstatite crystals, indicating a transition to interface-controlled growth. The crystals coarsen with time but maintain their order along the dendrite skeletons.

Document Type: Research Article


Affiliations: 1: Department of Advanced Materials Engineering, Jerusalem College of Engineering, Jerusalem, Israel 2: Department of Materials Engineering, Ben-Gurion University of the Negev, Beer Sheva, Israel

Publication date: 2005-08-01

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