Document Detail

Rotational Rehybridization and the High Temperature Phase of UC(2).
MedLine Citation:
PMID:  23148624     Owner:  NLM     Status:  Publisher    
The screened hybrid approximation (HSE) of density functional theory (DFT) is used to examine the structural, optical, and electronic properties of the high temperature phase, cubic UC(2). This phase contains C(2) units with a computed C-C distance of 1.443 Å which is in the range of a CC double bond; U is formally 4+, C(2) 4-. The closed shell paramagnetic state (NM) was found to lie lowest. Cubic UC(2) is found to be a semiconductor with a narrow gap, 0.4 eV. Interestingly, the C(2) units connecting two uranium sites can rotate freely up to an angle of 30°, indicating a hindered rotational solid. Ab-initio molecular dynamic simulations (HSE) show that the rotation of C(2) units in the low temperature phase (tetragonal UC(2)) occurs above 2000 K, in good agreement with experiment. The computed energy barrier for the phase transition from tetragonal UC(2) to cubic UC(2) is around 1.30 eV per UC(2). What is fascinating about this system is that at high temperature, the phase transformation to the cubic phase is associated with a rehybridization of the C atoms from sp to sp(3).
Xiao-Dong Wen; Sven P Rudin; Enrique R Batista; David L Clark; Gustavo E Scuseria; Richard L Martin
Related Documents :
1713074 - The influence of properties of packing materials upon the recovery of biological substa...
20192284 - Efficient computation of free energy of crystal phases due to external potentials by er...
23505624 - Highly conductive vo2 treated with hydrogen for supercapacitors.
24136654 - The fast filling of nano-sno2 in cnts by vacuum absorption: a new approach to realize c...
18205244 - Fragmentation reactions of singly and doubly protonated thiourea- and sugar-substituted...
15446994 - How much information can one store in a nonequilibrium medium?
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-13
Journal Detail:
Title:  Inorganic chemistry     Volume:  -     ISSN:  1520-510X     ISO Abbreviation:  Inorg Chem     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0366543     Medline TA:  Inorg Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Theoretical Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Cytologically confirmed splenic metastases in breast cancer.
Next Document:  Activated leukocyte cell adhesion molecule (ALCAM/CD166) is a marker for thyroid cancer aggressivene...