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Synthesis and Physical Properties of Iridium-Based Sulfide Ca1−xIr4S6(S2) x = 0.23–0.33
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Synthesis and Physical Properties of Iridium-Based Sulfide Ca1−xIr4S6(S2) x = 0.23–0.33
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Journal Article
Synthesis and Physical Properties of Iridium-Based Sulfide Ca1−xIr4S6(S2) x = 0.23–0.33
2022
Overview
We present the synthesis and characterization of the iridium-based sulfide Ca1−xIr4S6(S2). Quality and phase analysis were conducted by means of energy-dispersive X-ray spectroscopy (EDXS) and powder X-ray diffraction (XRD) techniques. Structure analysis reveals a monoclinic symmetry with the space group C 1 2/m 1 (No. 12), with the lattice constants a = 15.030 (3) Å, b = 3.5747 (5) Å and c = 10.4572 (18) Å. Both X-ray diffraction and EDXS suggest an off-stoichiometry of calcium, leading to the empirical composition Ca1−xIr4.0S6(S2) [x = 0.23–0.33]. Transport measurements show metallic behavior of the compound in the whole range of measured temperatures. Magnetic measurements down to 1.8 K show no long range order, and Curie–Weiss analysis yields θCW = −31.4 K, suggesting that the compound undergoes a magnetic state with short range magnetic correlations. We supplement our study with calculations of the band structure in the framework of the density functional theory.
Publisher
MDPI AG
