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Synthesis and properties of the Co7Se8−xSx and Ni7Se8−xSx solid solutions |
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| Authors: | Virginia Lea Miller Wei-li Lee Nai-Phuan Ong |
| Institution: | a Department of Chemistry, Frick Chemical Laboratory, Princeton University, Washington Road, Princeton, NJ 08544, USA b Department of Physics, Princeton University, Princeton, NJ 08544, USA c Los Alamos National Laboratory, Los Alamos, NM 87544, USA |
| Abstract: | We report the synthesis and elementary properties of the Co7Se8−xSx (x=0-8) and Ni7Se8−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 Ni7Se8−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 Co7Se8−xSx system, as well as Ni7Se8 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: | Co7Se8-xSx Ni7Se8-xSx Cobalt and nickel chalcogenides Magnetic properties |
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