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Samples with Cu12−xCoxSb4S13−ySey (0 ≤ x ≤ 2, 0 ≤ y ≤ 1) nominal compositions were prepared by melting the elements under vacuum, followed by slow cooling. The phases formed in this process were identified and characterized by powder x-ray diffraction and scanning electron microscopy observations, complemented with energy-dispersive spectroscopy. All samples have tetrahedrite as the major phase (>...