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Title: U 8Al 19Si 6, A Uranium Aluminide Silicide with a Stuffed Supercell Grown from Aluminum Flux

Abstract

In this work, U 8Al 19Si 6 is formed from the reaction of uranium oxide and silicon in aluminum flux. Growth of this material is dependent on the presence of surface hydroxyl groups on alumina in the crucible. The compound forms as large cuboid crystals with a complex new structure that is a cubic stuffed supercell of UAl 3 (AuCu 3 parent structure type). It features a 4-fold expansion of the unit cell axis and the addition of atoms on two extra positions resulting in Pm$$\bar{3n}$$ symmetry. The ordered distribution of aluminum and silicon was determined using single crystal neutron diffraction. The magnetic susceptibility shows temperature independent paramagnetic behavior, while heat capacity measurements are consistent with Fermi liquid characteristics at low temperatures where the Sommerfeld constant is enhanced in comparison to that of a conventional metal. Lastly, these bulk thermodynamic properties indicate that U 8Al 19Si 6 is an itinerant electron Pauli paramagnet with moderately enhanced mass charge carrier quasiparticles.

Authors:
 [1];  [1];  [2];  [1]; ORCiD logo [1]
  1. Florida State Univ., Tallahassee, FL (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Actinide Science & Technology (CAST); Florida State Univ., Tallahassee, FL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1566343
Grant/Contract Number:  
SC0016568
Resource Type:
Accepted Manuscript
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 30; Journal Issue: 11; Journal ID: ISSN 0897-4756
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; nuclear; defects; mechanical behavior; corrosion; charge transport; superconductivity; magnetism and spin physics; separations; geophysics/geochemistry; materials and chemistry by design; synthesis (novel materials); synthesis (self-assembly); synthesis (predictive); synthesis (scalable processing)

Citation Formats

Potter, Wesley M., Lai, You, Cao, Huibo, Baumbach, Ryan E., and Latturner, Susan E. U8Al19Si6, A Uranium Aluminide Silicide with a Stuffed Supercell Grown from Aluminum Flux. United States: N. p., 2018. Web. doi:10.1021/acs.chemmater.8b00948.
Potter, Wesley M., Lai, You, Cao, Huibo, Baumbach, Ryan E., & Latturner, Susan E. U8Al19Si6, A Uranium Aluminide Silicide with a Stuffed Supercell Grown from Aluminum Flux. United States. doi:10.1021/acs.chemmater.8b00948.
Potter, Wesley M., Lai, You, Cao, Huibo, Baumbach, Ryan E., and Latturner, Susan E. Thu . "U8Al19Si6, A Uranium Aluminide Silicide with a Stuffed Supercell Grown from Aluminum Flux". United States. doi:10.1021/acs.chemmater.8b00948. https://www.osti.gov/servlets/purl/1566343.
@article{osti_1566343,
title = {U8Al19Si6, A Uranium Aluminide Silicide with a Stuffed Supercell Grown from Aluminum Flux},
author = {Potter, Wesley M. and Lai, You and Cao, Huibo and Baumbach, Ryan E. and Latturner, Susan E.},
abstractNote = {In this work, U8Al19Si6 is formed from the reaction of uranium oxide and silicon in aluminum flux. Growth of this material is dependent on the presence of surface hydroxyl groups on alumina in the crucible. The compound forms as large cuboid crystals with a complex new structure that is a cubic stuffed supercell of UAl3 (AuCu3 parent structure type). It features a 4-fold expansion of the unit cell axis and the addition of atoms on two extra positions resulting in Pm$\bar{3n}$ symmetry. The ordered distribution of aluminum and silicon was determined using single crystal neutron diffraction. The magnetic susceptibility shows temperature independent paramagnetic behavior, while heat capacity measurements are consistent with Fermi liquid characteristics at low temperatures where the Sommerfeld constant is enhanced in comparison to that of a conventional metal. Lastly, these bulk thermodynamic properties indicate that U8Al19Si6 is an itinerant electron Pauli paramagnet with moderately enhanced mass charge carrier quasiparticles.},
doi = {10.1021/acs.chemmater.8b00948},
journal = {Chemistry of Materials},
number = 11,
volume = 30,
place = {United States},
year = {2018},
month = {5}
}

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Cited by: 2 works
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