title: Characterization and thermogravimetric analysis of lanthanide hexafluoroacetylacetone chelates.
abstract: This work reports the thermodynamic characterizations of organometallic species as a vehicle for the rapid separation of volatile nuclear fission products via gas chromatography due to differences in adsorption enthalpy. Because adsorption and sublimation thermodynamics are linearly correlated, there is considerable motivation to determine sublimation enthalpies. A method of isothermal thermogravimetric analysis, TGA-MS and melting point analysis are employed on thirteen lanthanide 1,1,1,5,5,5-hexafluoroacetylacetone complexes to determine sublimation enthalpies. An empirical correlation is used to estimate adsorption enthalpies of lanthanide complexes on a quartz column from the sublimation data. Additionally, four chelates are characterized by SC-XRD, elemental analysis, FTIR and NMR.
authors.affiliation: Department of Nuclear Engineering, University of Tennessee, 301 Middle Dr., Pasqua Nuclear Engineering Building, Knoxville, TN 37996 USA.
authors.forename: Shayan
authors.identifier: 0000-0002-4146-4448
authors.initials: S
authors.lastname: Shahbazi
authors.affiliation: Department of Nuclear Engineering, University of Tennessee, 301 Middle Dr., Pasqua Nuclear Engineering Building, Knoxville, TN 37996 USA.
authors.forename: S Adam
authors.initials: SA
authors.lastname: Stratz
authors.affiliation: Department of Nuclear Engineering, University of Tennessee, 301 Middle Dr., Pasqua Nuclear Engineering Building, Knoxville, TN 37996 USA ; Radiochemistry Center of Excellence, University of Tennessee, 1508 Middle Dr., Ferris Hall, Knoxville, TN 37996 USA ; Institute for Nuclear Security, University of Tennessee, 1640 Cumberland Ave. Howard Baker Jr. Center for Public Policy, Knoxville, TN 37996 USA.
authors.forename: John D
authors.initials: JD
authors.lastname: Auxier
authors.affiliation: Department of Nuclear Engineering, University of Tennessee, 301 Middle Dr., Pasqua Nuclear Engineering Building, Knoxville, TN 37996 USA.
authors.forename: Daniel E
authors.initials: DE
authors.lastname: Hanson
authors.affiliation: Department of Chemistry, University of Tennessee, 1420 Circle Dr., Buehler Hall, Knoxville, TN 37996 USA.
authors.forename: Matthew L
authors.initials: ML
authors.lastname: Marsh
authors.affiliation: Department of Nuclear Engineering, University of Tennessee, 301 Middle Dr., Pasqua Nuclear Engineering Building, Knoxville, TN 37996 USA ; Radiochemistry Center of Excellence, University of Tennessee, 1508 Middle Dr., Ferris Hall, Knoxville, TN 37996 USA ; Institute for Nuclear Security, University of Tennessee, 1640 Cumberland Ave. Howard Baker Jr. Center for Public Policy, Knoxville, TN 37996 USA.
authors.forename: Howard L
authors.initials: HL
authors.lastname: Hall
keywords: Hexafluoroacetylacetone; Lanthanides; Nuclear forensics; Rapid separations; Thermochromatography; Thermogravimetric analysis