Synthesis, structure, and magnetic characterization of Cr4US8

Matthew D. Ward; Ian Y. Chan; Christos D. Malliakas; Minseong Lee; Eun Sang Choi; James A. Ibers

doi:10.1016/j.jssc.2015.10.009

Synthesis, structure, and magnetic characterization of Cr₄US₈

Matthew D. Ward, Ian Y. Chan, Christos D. Malliakas, Minseong Lee, Eun Sang Choi, James A. Ibers^*

^*Corresponding author for this work

Chemistry

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

Abstract

The compound Cr₄US₈ has been synthesized at 1073 K and its crystal structure has been determined at 100 K. The structure is modulated with a two-fold commensurate supercell. The subcell may be indexed in an orthorhombic cell but weak supercell reflections lead to the monoclinic superspace group P2₁/c(α0γ)0s with two Cr sites, one U site, and four S sites. The structure comprises a three-dimensional framework of CrS₆ octahedra with channels that are partially occupied by U atoms. Each U atom in these channels is coordinated by eight S atoms in a bicapped trigonal-prismatic arrangement. The magnetic behavior of Cr₄US₈ is complex. At temperatures above ~120 K at all measured fields, there is little difference between field-cooled and zero field-cooled data and χ(T) decreases monotonously with temperature, which is reminiscent of the Curie-Weiss law. At lower temperatures, the temperature dependence of χ(T) is complex and strongly dependent on the magnetic field strength.

Original language	English (US)
Pages (from-to)	67-74
Number of pages	8
Journal	Journal of Solid State Chemistry
Volume	233
DOIs	https://doi.org/10.1016/j.jssc.2015.10.009
State	Published - Jan 1 2016

Keywords

Cr/U
Magnetism
Modulation
Structure

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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title = "Synthesis, structure, and magnetic characterization of Cr4US8",

abstract = "The compound Cr4US8 has been synthesized at 1073 K and its crystal structure has been determined at 100 K. The structure is modulated with a two-fold commensurate supercell. The subcell may be indexed in an orthorhombic cell but weak supercell reflections lead to the monoclinic superspace group P21/c(α0γ)0s with two Cr sites, one U site, and four S sites. The structure comprises a three-dimensional framework of CrS6 octahedra with channels that are partially occupied by U atoms. Each U atom in these channels is coordinated by eight S atoms in a bicapped trigonal-prismatic arrangement. The magnetic behavior of Cr4US8 is complex. At temperatures above ~120 K at all measured fields, there is little difference between field-cooled and zero field-cooled data and χ(T) decreases monotonously with temperature, which is reminiscent of the Curie-Weiss law. At lower temperatures, the temperature dependence of χ(T) is complex and strongly dependent on the magnetic field strength.",

keywords = "Cr/U, Magnetism, Modulation, Structure",

author = "Ward, {Matthew D.} and Chan, {Ian Y.} and Malliakas, {Christos D.} and Minseong Lee and Choi, {Eun Sang} and Ibers, {James A.}",

note = "Funding Information: This research was supported at Northwestern University by the U.S. Department of Energy , Basic Energy Sciences, Chemical Sciences, Biosciences and Geosciences Division and Division of Materials Science and Engineering Grant ER-15522 . Use was made of the IMSERC X-ray facility at Northwestern University, supported by the International Institute of Nanotechnology . C.D.M. was supported by the U.S. Department of Energy, Office of Basic Energy Sciences under Contract no. DE-AC02-06CH11357 . A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by NSF Cooperative Agreement no. DMR–1157490 by the State of Florida and by the DOE. ",

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doi = "10.1016/j.jssc.2015.10.009",

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AU - Ward, Matthew D.

AU - Chan, Ian Y.

AU - Malliakas, Christos D.

AU - Lee, Minseong

AU - Choi, Eun Sang

AU - Ibers, James A.

N1 - Funding Information: This research was supported at Northwestern University by the U.S. Department of Energy , Basic Energy Sciences, Chemical Sciences, Biosciences and Geosciences Division and Division of Materials Science and Engineering Grant ER-15522 . Use was made of the IMSERC X-ray facility at Northwestern University, supported by the International Institute of Nanotechnology . C.D.M. was supported by the U.S. Department of Energy, Office of Basic Energy Sciences under Contract no. DE-AC02-06CH11357 . A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by NSF Cooperative Agreement no. DMR–1157490 by the State of Florida and by the DOE.

PY - 2016/1/1

Y1 - 2016/1/1

N2 - The compound Cr4US8 has been synthesized at 1073 K and its crystal structure has been determined at 100 K. The structure is modulated with a two-fold commensurate supercell. The subcell may be indexed in an orthorhombic cell but weak supercell reflections lead to the monoclinic superspace group P21/c(α0γ)0s with two Cr sites, one U site, and four S sites. The structure comprises a three-dimensional framework of CrS6 octahedra with channels that are partially occupied by U atoms. Each U atom in these channels is coordinated by eight S atoms in a bicapped trigonal-prismatic arrangement. The magnetic behavior of Cr4US8 is complex. At temperatures above ~120 K at all measured fields, there is little difference between field-cooled and zero field-cooled data and χ(T) decreases monotonously with temperature, which is reminiscent of the Curie-Weiss law. At lower temperatures, the temperature dependence of χ(T) is complex and strongly dependent on the magnetic field strength.

AB - The compound Cr4US8 has been synthesized at 1073 K and its crystal structure has been determined at 100 K. The structure is modulated with a two-fold commensurate supercell. The subcell may be indexed in an orthorhombic cell but weak supercell reflections lead to the monoclinic superspace group P21/c(α0γ)0s with two Cr sites, one U site, and four S sites. The structure comprises a three-dimensional framework of CrS6 octahedra with channels that are partially occupied by U atoms. Each U atom in these channels is coordinated by eight S atoms in a bicapped trigonal-prismatic arrangement. The magnetic behavior of Cr4US8 is complex. At temperatures above ~120 K at all measured fields, there is little difference between field-cooled and zero field-cooled data and χ(T) decreases monotonously with temperature, which is reminiscent of the Curie-Weiss law. At lower temperatures, the temperature dependence of χ(T) is complex and strongly dependent on the magnetic field strength.

KW - Cr/U

KW - Magnetism

KW - Modulation

KW - Structure

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