The Structural, Magnetic Susceptibility, and Raman Spectroscopy Study of CuRh1−xCoxO2 (0≤x≤0.05) Delafossite Compounds

In the layered structure of delafossite-type metal oxides AMO2, the M position can be occupied by a wide spectrum of trivalent or couples of divalent/tetravalent cations. In the A position, however, only monovalent, linearly coordinated cations are accommodated. This study focuses on CuRh1−xCoxO2 (0≤x≤0.05) polycrystalline samples which are prepared by solid-state reaction method. Magnetic susceptibility measurements of all samples were done in a temperature range 2–250 K. The interaction of the M cations with each other through M–O–M linkages of approximately 180° is expected to be the dominant consideration, and this would be paramagnetic in nature. The composition-dependent Raman spectra of CuRh1−xCoxO2 displayed three intense modes (670 cm−1, 490 cm−1, and 204 cm−1) at room temperature, which matched with other delafossite structures.