Synthesis and properties of the Co7Se8- xSx and Ni7Se8-xS x solid solutions

Virginia Lea Miller; Wei Li Lee; Gavin Lawes; Nai Phuan Ong; Robert J. Cava

doi:10.1016/j.jssc.2004.11.013

Synthesis and properties of the Co₇Se_8- _xS_x and Ni₇Se_8-xS _x solid solutions

Virginia Lea Miller, Wei Li Lee, Gavin Lawes, Nai Phuan Ong, Robert J. Cava

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

14 Scopus citations

Abstract

We report the synthesis and elementary properties of the Co ₇Se_8-xS_x (x=0-8) and Ni ₇Se_8-xS_x (x=0-7) solid solutions. Both systems form a NiAs-type structure with metal vacancies. In general, the lattice parameters decrease with increasing x, but in the Ni₇Se _8-xS_x system c increases on going from x=5 to 7. Magnetic susceptibility measurements show that all samples exhibit temperature-independent paramagnetism from 25-250 K. Samples within the Co ₇Se_8-xS_x system, as well as Ni ₇Se₈ and Ni₇SeS₇, were found to be poor metals with resistivities of ∼0.20 and ∼0.06 mΩ cm at 300 K, respectively. The Sommerfeld constant (γ) was determined from specific heat measurements to be ∼13 mJ/mol_CoK² and ∼7 mJ/mol_NiK² for Co₇Se_8-xS_x and Ni₇Se_8-xS_x, respectively.

Original language	English (US)
Pages (from-to)	1508-1512
Number of pages	5
Journal	Journal of Solid State Chemistry
Volume	178
Issue number	5
DOIs	https://doi.org/10.1016/j.jssc.2004.11.013
State	Published - May 2005

All Science Journal Classification (ASJC) codes

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

Keywords

CoSeS
Cobalt and nickel chalcogenides
Magnetic properties
Ni SeS

Access to Document

10.1016/j.jssc.2004.11.013

Cite this

@article{2312fa080176475996b14f88aafc77d7,

title = "Synthesis and properties of the Co7Se8- xSx and Ni7Se8-xS x solid solutions",

abstract = "We report the synthesis and elementary properties of the Co 7Se8-xSx (x=0-8) and Ni 7Se8-xSx (x=0-7) solid solutions. Both systems form a NiAs-type structure with metal vacancies. In general, the lattice parameters decrease with increasing x, but in the Ni7Se 8-xSx system c increases on going from x=5 to 7. Magnetic susceptibility measurements show that all samples exhibit temperature-independent paramagnetism from 25-250 K. Samples within the Co 7Se8-xSx system, as well as Ni 7Se8 and Ni7SeS7, were found to be poor metals with resistivities of ∼0.20 and ∼0.06 mΩ cm at 300 K, respectively. The Sommerfeld constant (γ) was determined from specific heat measurements to be ∼13 mJ/molCoK2 and ∼7 mJ/molNiK2 for Co7Se8-xSx and Ni7Se8-xSx, respectively.",

keywords = "CoSeS, Cobalt and nickel chalcogenides, Magnetic properties, Ni SeS",

author = "Miller, {Virginia Lea} and Lee, {Wei Li} and Gavin Lawes and Ong, {Nai Phuan} and Cava, {Robert J.}",

note = "Funding Information: This work was supported by the National Science Foundation (MRSEC Program) through the Princeton Center for Complex Materials (DMR 0213706). ",

year = "2005",

month = may,

doi = "10.1016/j.jssc.2004.11.013",

language = "English (US)",

volume = "178",

pages = "1508--1512",

journal = "Journal of Solid State Chemistry",

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publisher = "Academic Press Inc.",

number = "5",

}

TY - JOUR

T1 - Synthesis and properties of the Co7Se8- xSx and Ni7Se8-xS x solid solutions

AU - Miller, Virginia Lea

AU - Lee, Wei Li

AU - Lawes, Gavin

AU - Ong, Nai Phuan

AU - Cava, Robert J.

N1 - Funding Information: This work was supported by the National Science Foundation (MRSEC Program) through the Princeton Center for Complex Materials (DMR 0213706).

PY - 2005/5

Y1 - 2005/5

N2 - We report the synthesis and elementary properties of the Co 7Se8-xSx (x=0-8) and Ni 7Se8-xSx (x=0-7) solid solutions. Both systems form a NiAs-type structure with metal vacancies. In general, the lattice parameters decrease with increasing x, but in the Ni7Se 8-xSx system c increases on going from x=5 to 7. Magnetic susceptibility measurements show that all samples exhibit temperature-independent paramagnetism from 25-250 K. Samples within the Co 7Se8-xSx system, as well as Ni 7Se8 and Ni7SeS7, were found to be poor metals with resistivities of ∼0.20 and ∼0.06 mΩ cm at 300 K, respectively. The Sommerfeld constant (γ) was determined from specific heat measurements to be ∼13 mJ/molCoK2 and ∼7 mJ/molNiK2 for Co7Se8-xSx and Ni7Se8-xSx, respectively.

AB - We report the synthesis and elementary properties of the Co 7Se8-xSx (x=0-8) and Ni 7Se8-xSx (x=0-7) solid solutions. Both systems form a NiAs-type structure with metal vacancies. In general, the lattice parameters decrease with increasing x, but in the Ni7Se 8-xSx system c increases on going from x=5 to 7. Magnetic susceptibility measurements show that all samples exhibit temperature-independent paramagnetism from 25-250 K. Samples within the Co 7Se8-xSx system, as well as Ni 7Se8 and Ni7SeS7, were found to be poor metals with resistivities of ∼0.20 and ∼0.06 mΩ cm at 300 K, respectively. The Sommerfeld constant (γ) was determined from specific heat measurements to be ∼13 mJ/molCoK2 and ∼7 mJ/molNiK2 for Co7Se8-xSx and Ni7Se8-xSx, respectively.

KW - CoSeS

KW - Cobalt and nickel chalcogenides

KW - Magnetic properties

KW - Ni SeS

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