Close packing and pressure-induced amorphization

Sikka, S. K. ; Sharma, Surinder M. (1992) Close packing and pressure-induced amorphization Current Science, 63 (6). pp. 317-320. ISSN 0011-3891

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Abstract

Recently a large number of crystalline compounds have been discovered to amorphize at high pressures. However, 1 the molecular origin of this transformation is not under- ' stood. In this article, we show that this is a : consequence of a competition between the close-packing i and long range order — a principle well known in organic 1 crystallography. We show that the tendency of these i systems to acquire higher coordination under compression is ; sterically hindered at some pressure due to the strong , nature of inter-molecular bonding of building blocks.This hindrance drives the system to sacrifice the transitional order to achieve better packing. The application of principle is shown through the examples of Ca(OH)2, SiO2, ice, LiKSO4, etc.

Item Type:Article
Source:Copyright of this article belongs to Current Science Association.
ID Code:88234
Deposited On:23 Jun 2012 14:00
Last Modified:19 May 2016 03:12

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