caa a22 4500 467925933 CHVBK 20180406152929.0 cr unu---uuuuu 170328e20060901xx s 000 0 eng 10.1134/S002016850609010X doi (NATIONALLICENCE)springer-10.1134/S002016850609010X Raman spectra and structure of silicon-oxygen groups in crystalline, liquid, and glassy Mg2SiO4 [Elektronische Daten] [Yu. Voronko, A. Sobol, V. Shukshin] We have measured the Raman spectra of magnesium orthosilicate at temperatures from 300 to 2170 K and have shown that liquid magnesium orthosilicate can be supercooled to 1600 K and can be prepared in the form of glass at quenching rates above 400 K/s. Analysis of Raman results indicates that, in contrast to crystalline Mg2SiO4, liquid and glassy magnesium orthosilicate contains not only isolated [SiO4]4− groups but also polymerized anions made up of corner-shared [SiO4] tetrahedra. This accounts for the observed deep (down to 600 K) supercooling and vitrification of liquid magnesium orthosilicate. During cooling, large [SiO4] groups have a tendency to depolymerize, and the concentration of isolated [SiO4]4− tetrahedra in the super-cooled magnesium orthosilicate melt increases, leading to spontaneous crystallization below 1550 K. Pleiades Publishing, Inc., 2006 Voronko Yu Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, 119991, Moscow, Russia aut Sobol A. Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, 119991, Moscow, Russia aut Shukshin V. Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, 119991, Moscow, Russia aut Inorganic Materials Nauka/Interperiodica 42/9(2006-09-01), 981-988 0020-1685 42:9<981 2006 42 10789 https://doi.org/10.1134/S002016850609010X text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S002016850609010X text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Voronko Yu Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Sobol A. Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Shukshin V. Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, 119991, Moscow, Russia aut NATIONALLICENCE 773 0- Inorganic Materials Nauka/Interperiodica 42/9(2006-09-01), 981-988 0020-1685 42:9<981 2006 42 10789 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer