Document Detail

First-principles investigations of the pressure-induced structural transitions in Mg(AlH(4))(2).
MedLine Citation:
PMID:  21690951     Owner:  NLM     Status:  In-Data-Review    
A systematic investigation is presented of the high-pressure structural stability of Mg(AlH(4))(2) using a plane-wave pseudo-potential method. The total-energy calculations show that under ambient pressure the structure of α-Mg(AlH(4))(2) found by experiments is more stable than the other proposed structures, and with pressure increasing the α to β (δ-Zr(MoO(4))(2)-type structure) and β to γ (Ca(BF(4))(2)-type structure) transitions occur at 0.67 and 10.28 GPa respectively, accompanied with volume reductions of 6.6% and 8.7%. A detailed study of the electronic structures reveals the bonding characteristics between Al and H and between Mg and H as well as the nonmetallic features of α, β, and γ phases under pressure of up to 20.0 GPa. Their electronic structures are mainly responsible for the relative high-pressure stability of the three phases. Finally, an analysis of their structural relations indicates that it is possible to produce the [Formula: see text] structural transition by applying pressure.
C H Hu; D M Chen; Y M Wang; D S Xu; K Yang
Publication Detail:
Type:  Journal Article     Date:  2007-03-28
Journal Detail:
Title:  Journal of physics. Condensed matter : an Institute of Physics journal     Volume:  19     ISSN:  0953-8984     ISO Abbreviation:  J Phys Condens Matter     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2011-06-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101165248     Medline TA:  J Phys Condens Matter     Country:  England    
Other Details:
Languages:  eng     Pagination:  176205     Citation Subset:  -    
National Engineering Research Center, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua road, Shenyang 110016, People's Republic of China.
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