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Title: Uncovering the Origin of Divergence in the CsM(CrO 4 ) 2 (M = La, Pr, Nd, Sm, Eu; Am) Family through Examination of the Chemical Bonding in a Molecular Cluster and by Band Structure Analysis

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.7b09474· OSTI ID:1434561
 [1];  [1];  [2];  [2]; ORCiD logo [3];  [1];  [1];  [1];  [4];  [5];  [5];  [6]; ORCiD logo [1]; ORCiD logo [7];  [6]
  1. Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
  2. Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08856-8019, United States
  3. Department of Physics and Astronomy, and Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011, United States
  4. Department of Physics, Florida State University, Tallahassee, Florida 32306, United States, National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
  5. National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States, Department of Chemical Engineering, Florida State University, Tallahassee, Florida 32310, United States
  6. National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
  7. School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom

A series of f-block chromates, CsM(CrO4)2 (M = La, Pr, Nd, Sm, Eu; Am), were prepared revealing notable differences between the AmIII derivatives and their lanthanide analogs. While all compounds form similar layered structures, the americium compound exhibits polymorphism and adopts both a structure isomorphous with the early lanthanides as well as one that possesses lower symmetry. Both polymorphs are dark red and possess band gaps that are smaller than the LnIII compounds. In order to probe the origin of these differences, the electronic structure of α-CsSm(CrO4)2, α-CsEu(CrO4)2, and α-CsAm(CrO4)2 were studied using both a molecular cluster approach featuring hybrid density functional theory and QTAIM analysis and by the periodic LDA+GA and LDA+DMFT methods. Notably, the covalent contributions to bonding by the f orbitals were found to be more than twice as large in the AmIII chromate than in the SmIII and EuIII compounds, and even larger in magnitude than the Am-5f spin–orbit splitting in this system. Our analysis indicates also that the Am–O covalency in α-CsAm(CrO4)2 is driven by the degeneracy of the 5f and 2p orbitals, and not by orbital overlap.

Research Organization:
Ames Lab., Ames, IA (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Actinide Science & Technology (CAST)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0016568; AC02-07CH11358
OSTI ID:
1434561
Alternate ID(s):
OSTI ID: 1427725; OSTI ID: 1508589
Report Number(s):
IS-J-9584
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Vol. 140 Journal Issue: 5; ISSN 0002-7863
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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