TY - JOUR
T1 - Synthesis and characterization of quaternary sulfides with ThCr2Si2-type structure
T2 - KCo2-xCuxS2 (0.5 ≤ x ≤ 1.5) and ACoCuS2 (A = K, Rb, Cs)
AU - Oledzka, M.
AU - Lee, J. G.
AU - Ramanujachary, K. V.
AU - Greenblatt, M.
N1 - Funding Information:
We thank Professor Bill McCarroll for critically reading this manuscript. Dr. P. Höhn is acknowledged for useful discussions. One of us (K.V.R.) thanks Rowan College for the award of PAG release time. This work was supported by the National Science Foundation under Solid State Chemistry Grant DMR-93-14605.
PY - 1996/12
Y1 - 1996/12
N2 - Synthesis, electrical, and magnetic properties of new quaternary alkali metal mixed-transition metal sulfides [ACoCuS2 (A = K, Rb, Cs) and KCo2-xCuxS2 (0.5 ≤ x ≤ 1.5)] are reported. The synthesis was accomplished by sulfurization of a mixture of corresponding alkali metal carbonate and copper and cobalt oxides. All of the phases form in the tetragonal ThCr2Si2-type structure in space group I4/mmm. The electrical resistivity measurements show that the new phases are semiconducting, with room temperature resistivities ρRT ∼ 10-2 Ω · cm; KCo0.5Cu1.5S2 is metallic with a metal-to-nonmetal transition at ∼120 K. Seebeck measurements indicate that the majority of charge carriers are holes. The temperature dependence of magnetic susceptibility shows an anomalous transition to the ferromagnetic state in the ACoCuS2 phases. The electrical and magnetic properties of the new quaternary phases are compared with those of ternary ACo2S2 (A = K, Rb, Cs).
AB - Synthesis, electrical, and magnetic properties of new quaternary alkali metal mixed-transition metal sulfides [ACoCuS2 (A = K, Rb, Cs) and KCo2-xCuxS2 (0.5 ≤ x ≤ 1.5)] are reported. The synthesis was accomplished by sulfurization of a mixture of corresponding alkali metal carbonate and copper and cobalt oxides. All of the phases form in the tetragonal ThCr2Si2-type structure in space group I4/mmm. The electrical resistivity measurements show that the new phases are semiconducting, with room temperature resistivities ρRT ∼ 10-2 Ω · cm; KCo0.5Cu1.5S2 is metallic with a metal-to-nonmetal transition at ∼120 K. Seebeck measurements indicate that the majority of charge carriers are holes. The temperature dependence of magnetic susceptibility shows an anomalous transition to the ferromagnetic state in the ACoCuS2 phases. The electrical and magnetic properties of the new quaternary phases are compared with those of ternary ACo2S2 (A = K, Rb, Cs).
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U2 - 10.1006/jssc.1996.0371
DO - 10.1006/jssc.1996.0371
M3 - Article
AN - SCOPUS:0001338587
SN - 0022-4596
VL - 127
SP - 151
EP - 160
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
IS - 2
ER -