Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
A Novel Family of Np(VI) Oxysalts : Crystal Structures, Calorimetry, Thermal Behavior, and Comparison with U(VI) Compounds. / Kornyakov, Ilya V.; Gurzhiy, Vladislav V.; Szymanowski, Jennifer E.S.; Zhang, Lei; Perry, Samuel N.; Krivovichev, Sergey V.; Burns, Peter C.
в: Crystal Growth and Design, Том 19, № 5, 26.03.2019, стр. 2811-2819.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - A Novel Family of Np(VI) Oxysalts
T2 - Crystal Structures, Calorimetry, Thermal Behavior, and Comparison with U(VI) Compounds
AU - Kornyakov, Ilya V.
AU - Gurzhiy, Vladislav V.
AU - Szymanowski, Jennifer E.S.
AU - Zhang, Lei
AU - Perry, Samuel N.
AU - Krivovichev, Sergey V.
AU - Burns, Peter C.
PY - 2019/3/26
Y1 - 2019/3/26
N2 - Phase formation in the mixed sulfate-selenate Np(VI)-bearing aqueous system has been investigated. The obtained crystalline compounds, Cs 2 [(NpO 2 ) 2 (TO 4 ) 3 ] (T = S, Se), crystallize in the tetragonal system, space group P4 2 1 m, with a = 9.5737(3)-9.817(3) Å, c = 8.0824(4)-8.111(3) Å, and V = 740.79(6)-781.8(6) Å 3 , and have been chemically characterized. Single-crystal X-ray diffraction experiments at various temperatures were used to define the thermal behavior of the crystal structures relative to the S/Se ratio. The thermal behavior of mixed sulfate-selenate and pure selenate compounds is anisotropic, with the highest thermal expansion in the direction perpendicular to the sheets of Np-bearing polyhedra, while the structure of the pure sulfate compound experiences almost isotropic thermal expansion with slightly higher expansion within the layer, which is explained by the influence of stronger Cs-O bonding. High-temperature drop solution calorimetry was used to derive the enthalpies of formation of the Cs + -bearing neptunyl oxysalts. Within this family of isotypic structures, cesium neptunyl sulfate has a more negative enthalpy of formation in comparison to the selenate compound.
AB - Phase formation in the mixed sulfate-selenate Np(VI)-bearing aqueous system has been investigated. The obtained crystalline compounds, Cs 2 [(NpO 2 ) 2 (TO 4 ) 3 ] (T = S, Se), crystallize in the tetragonal system, space group P4 2 1 m, with a = 9.5737(3)-9.817(3) Å, c = 8.0824(4)-8.111(3) Å, and V = 740.79(6)-781.8(6) Å 3 , and have been chemically characterized. Single-crystal X-ray diffraction experiments at various temperatures were used to define the thermal behavior of the crystal structures relative to the S/Se ratio. The thermal behavior of mixed sulfate-selenate and pure selenate compounds is anisotropic, with the highest thermal expansion in the direction perpendicular to the sheets of Np-bearing polyhedra, while the structure of the pure sulfate compound experiences almost isotropic thermal expansion with slightly higher expansion within the layer, which is explained by the influence of stronger Cs-O bonding. High-temperature drop solution calorimetry was used to derive the enthalpies of formation of the Cs + -bearing neptunyl oxysalts. Within this family of isotypic structures, cesium neptunyl sulfate has a more negative enthalpy of formation in comparison to the selenate compound.
KW - ACTINIDES
KW - CS
KW - DIRECTIONS
KW - NEPTUNIUM
KW - OXIDES
KW - PROGRESS
KW - THERMOCHEMISTRY
KW - URANIUM
UR - http://www.scopus.com/inward/record.url?scp=85065132517&partnerID=8YFLogxK
U2 - 10.1021/acs.cgd.9b00043
DO - 10.1021/acs.cgd.9b00043
M3 - Article
AN - SCOPUS:85065132517
VL - 19
SP - 2811
EP - 2819
JO - Crystal Growth and Design
JF - Crystal Growth and Design
SN - 1528-7483
IS - 5
ER -
ID: 42422124