Anomalous high-pressure behavior of amorphous selenium from synchrotron x-ray diffraction and microtomography.

Abstract:

:The high-pressure behavior of amorphous selenium has been investigated with time-resolved diamond anvil cell synchrotron x-ray diffraction and computed microtomography techniques. A two-step dynamic crystallization process is observed in which the monoclinic phase crystallized from the amorphous selenium and gradually converted to the trigonal phase, thereby explaining previously observed anomalous changes in electrical conductivity of the material under pressure. The crystallization of this elemental system involves local topological fluctuations and results in an unusual pressure-induced volume expansion. The metastability of the phases involved in the transition accounts for this phenomenon. The results demonstrate the use of pressure to control and directly monitor the relative densities and energetics of phases to create new phases from highly metastable states. The microtomographic technique developed here represents a method for determination of the equations of state of amorphous materials at extreme pressures and temperatures.

authors

Liu H,Wang L,Xiao X,De Carlo F,Feng J,Mao HK,Hemley RJ

doi

10.1073/pnas.0806857105

subject

Has Abstract

pub_date

2008-09-09 00:00:00

pages

13229-34

issue

36

eissn

0027-8424

issn

1091-6490

pii

0806857105

journal_volume

105

pub_type

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