Volume 42, Number 6, June II 1998
|Page(s)||643 - 648|
|Section||Condensed matter: structure, thermal and mechanical properties|
|Published online||01 September 2002|
Melting and pressure-induced amorphization of quartz
Laboratoire de Sciences de la Terre,
École Normale Supérieure de Lyon, 46, allée d'Italie,
69364 Lyon cedex 07, France
2 Département de Physique des Matériaux, Université Claude Bernard, Lyon I, 43, bd. du 11 novembre 1918, 69622 Villeurbanne cedex, France
Accepted: 21 April 1998
It has recently been shown that amorphization and melting of ice (O. Mishima, Nature, 384 (1996) 546) were intimately linked. In this letter, we infer from molecular-dynamics simulations on the system that the extension of the α-quartz melting line in the metastable pressure-temperature domain is the pressure-induced amorphization line. It seems therefore likely that melting is the physical phenomenon responsible for pressure-induced amorphization. Moreover, we show that the structure of a “pressure glass” is similar to that of a very rapidly (1013 to 1014 kelvins per second) quenched thermal glass.
PACS: 62.50.+p – High-pressure and shock-wave effects in solids and liquids / 61.20.-p – Structure of liquids / 64.70.Dv – Solid liquid transitions
© EDP Sciences, 1998
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