La2U2Se9: An ordered lanthanide/actinide chalcogenide with a novel structure type

Daniel E. Bugaris; Roy Copping; Tolek Tyliszczak; David K. Shuh; James A. Ibers

doi:10.1021/ic902503n

La₂U₂Se₉: An ordered lanthanide/actinide chalcogenide with a novel structure type

Daniel E. Bugaris, Roy Copping, Tolek Tyliszczak, David K. Shuh, James A. Ibers

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

The compound La₂U₂Se₉ was obtained in high yield from the stoichiometric reaction of the elements in an Sb ₂Se₃ flux at 1123 K. The compound, which crystallizes in a new structure type in space group Pmma of the orthorhombic system, has a three-dimensional structure with alternating U/Se and La/Se layers attached via three independent, infinite polyselenide chains. The U atom has a monocapped square antiprismatlc coordination of Se atoms, whereas one La atom is bicapped square prismatic and the other La atom is trigonal prismatic. La ₂U₂Se₉ displays an antiferromagnetic transition at T_N = 5 K; above 50 K, the paramagnetic behavior can be fit to the Curie-Weiss law, yielding a μ_eff of 3.10(1) μ_B/U. The low-temperature specific heat of La₂U₂Se₉ exhibits no anomalous behavior near the Néel temperature that might indicate long-range magnetic ordering or a phase transition. X-ray absorption near-edge structure (XANES) spectra have confirmed the assignment of formal oxidation states of +III for lanthanum and +IV for uranium in La ₂U₂Se₉.

Original language	English
Pages (from-to)	2568-2575
Number of pages	8
Journal	Inorganic Chemistry
Volume	49
Issue number	5
DOIs	https://doi.org/10.1021/ic902503n
State	Published - Mar 1 2010
Externally published	Yes

Access to Document

10.1021/ic902503n

Cite this

@article{ae89d3973985488aa8f684e0373790f7,

title = "La2U2Se9: An ordered lanthanide/actinide chalcogenide with a novel structure type",

abstract = "The compound La2U2Se9 was obtained in high yield from the stoichiometric reaction of the elements in an Sb 2Se3 flux at 1123 K. The compound, which crystallizes in a new structure type in space group Pmma of the orthorhombic system, has a three-dimensional structure with alternating U/Se and La/Se layers attached via three independent, infinite polyselenide chains. The U atom has a monocapped square antiprismatlc coordination of Se atoms, whereas one La atom is bicapped square prismatic and the other La atom is trigonal prismatic. La 2U2Se9 displays an antiferromagnetic transition at TN = 5 K; above 50 K, the paramagnetic behavior can be fit to the Curie-Weiss law, yielding a μeff of 3.10(1) μB/U. The low-temperature specific heat of La2U2Se9 exhibits no anomalous behavior near the N{\'e}el temperature that might indicate long-range magnetic ordering or a phase transition. X-ray absorption near-edge structure (XANES) spectra have confirmed the assignment of formal oxidation states of +III for lanthanum and +IV for uranium in La 2U2Se9.",

author = "Bugaris, {Daniel E.} and Roy Copping and Tolek Tyliszczak and Shuh, {David K.} and Ibers, {James A.}",

year = "2010",

month = mar,

day = "1",

doi = "10.1021/ic902503n",

language = "English",

volume = "49",

pages = "2568--2575",

journal = "Inorganic Chemistry",

issn = "0020-1669",

publisher = "American Chemical Society",

number = "5",

}

TY - JOUR

T1 - La2U2Se9

T2 - An ordered lanthanide/actinide chalcogenide with a novel structure type

AU - Bugaris, Daniel E.

AU - Copping, Roy

AU - Tyliszczak, Tolek

AU - Shuh, David K.

AU - Ibers, James A.

PY - 2010/3/1

Y1 - 2010/3/1

N2 - The compound La2U2Se9 was obtained in high yield from the stoichiometric reaction of the elements in an Sb 2Se3 flux at 1123 K. The compound, which crystallizes in a new structure type in space group Pmma of the orthorhombic system, has a three-dimensional structure with alternating U/Se and La/Se layers attached via three independent, infinite polyselenide chains. The U atom has a monocapped square antiprismatlc coordination of Se atoms, whereas one La atom is bicapped square prismatic and the other La atom is trigonal prismatic. La 2U2Se9 displays an antiferromagnetic transition at TN = 5 K; above 50 K, the paramagnetic behavior can be fit to the Curie-Weiss law, yielding a μeff of 3.10(1) μB/U. The low-temperature specific heat of La2U2Se9 exhibits no anomalous behavior near the Néel temperature that might indicate long-range magnetic ordering or a phase transition. X-ray absorption near-edge structure (XANES) spectra have confirmed the assignment of formal oxidation states of +III for lanthanum and +IV for uranium in La 2U2Se9.

AB - The compound La2U2Se9 was obtained in high yield from the stoichiometric reaction of the elements in an Sb 2Se3 flux at 1123 K. The compound, which crystallizes in a new structure type in space group Pmma of the orthorhombic system, has a three-dimensional structure with alternating U/Se and La/Se layers attached via three independent, infinite polyselenide chains. The U atom has a monocapped square antiprismatlc coordination of Se atoms, whereas one La atom is bicapped square prismatic and the other La atom is trigonal prismatic. La 2U2Se9 displays an antiferromagnetic transition at TN = 5 K; above 50 K, the paramagnetic behavior can be fit to the Curie-Weiss law, yielding a μeff of 3.10(1) μB/U. The low-temperature specific heat of La2U2Se9 exhibits no anomalous behavior near the Néel temperature that might indicate long-range magnetic ordering or a phase transition. X-ray absorption near-edge structure (XANES) spectra have confirmed the assignment of formal oxidation states of +III for lanthanum and +IV for uranium in La 2U2Se9.

UR - http://www.scopus.com/inward/record.url?scp=77649115385&partnerID=8YFLogxK

U2 - 10.1021/ic902503n

DO - 10.1021/ic902503n

M3 - Article

AN - SCOPUS:77649115385

SN - 0020-1669

VL - 49

SP - 2568

EP - 2575

JO - Inorganic Chemistry

JF - Inorganic Chemistry

IS - 5

ER -

La₂U₂Se₉: An ordered lanthanide/actinide chalcogenide with a novel structure type

Abstract

Access to Document

Other files and links

Fingerprint

Cite this