caa a22 4500 388022620 CHVBK 20180307124928.0 cr unu---uuuuu 161130e199805 xx s 000 0 eng 10.1557/JMR.1998.0191 doi S0884291400044277 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0191 Crystallization behavior and cordierite formation in rapidly quenched MgAl2O4-SiO2 glasses of various chemical compositions [Elektronische Daten] Crystallization behavior of various compositions of MgAl2O4 -SiO2 glasses was investigated. Glasses with chemical compositions from MgAl2O4/SiO2 = 1/1 to 1/8, spanning the range of cordierite composition (1:2.5) were prepared by a rapid quenching method using an arc image furnace and twin roller. During thermal treatment, all the glasses first crystallized to form high-quartz solid solution (HQss), then transformed to high-cordierite at higher temperature. Transformation from high-cordierite to low-cordierite required prolonged firing times even at high temperature. The crystallization temperature of HQss and the transformation temperature from HQss to high-cordierite changed only slightly in the glasses with MgAl2O4/SiO2 ratios greater than cordierite composition, whereas large increases were found for glasses with MgAl2O4/SiO2 ratios lower than cordierite. The HQss phase appeared in the samples spanning a wide MgAl2O4/SiO2 range and showed superlattice reflections which doubled the fundamental lattice parameters. The cause for HQss formation prior to the appearance of cordierite in these glass samples is discussed from a structural viewpoint involving ordering-disordering of SiO4 and AlO4 tetrahedra deduced from 29Si and 27Al MAS-NMR spectra. Copyright © Materials Research Society 1998 Okada Kiyoshi Department of Inorganic Materials, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152, Japan Kawashim Hiroshi Department of Inorganic Materials, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152, Japan Hayashi Shigeo Research Institute of Materials and Resources, Mining College, Akita University, Tegata-Gakuen, Akita 010, Japan Sugai Mikio Research Institute of Materials and Resources, Mining College, Akita University, Tegata-Gakuen, Akita 010, Japan MacKenzie Kenneth J. D. New Zealand Institute for Industrial Research and Development, Lower Hutt, New Zealand Journal of Materials Research Cambridge University Press 13/5(1998-05), 1351-1357 0884-2914 13:5<1351 1998 13 JMR https://doi.org/10.1557/JMR.1998.0191 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0191 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Okada Kiyoshi Department of Inorganic Materials, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152, Japan NATIONALLICENCE 700 1- Kawashim Hiroshi Department of Inorganic Materials, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152, Japan NATIONALLICENCE 700 1- Hayashi Shigeo Research Institute of Materials and Resources, Mining College, Akita University, Tegata-Gakuen, Akita 010, Japan NATIONALLICENCE 700 1- Sugai Mikio Research Institute of Materials and Resources, Mining College, Akita University, Tegata-Gakuen, Akita 010, Japan NATIONALLICENCE 700 1- MacKenzie Kenneth J. D. New Zealand Institute for Industrial Research and Development, Lower Hutt, New Zealand NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/5(1998-05), 1351-1357 0884-2914 13:5<1351 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge