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Published on: December 6, 2021
Heterometallic ludwigite M2.5T0.5(O2BO3) and (M2T)(O2BO3) (M = Co, Ni, Cu; T = Ti, Sn, Fe) compounds as
Indrani G Shanmugapriya1, K Vipin Raj2, Manoj Dey3
1Framework Solids Laboratory, Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, Karnataka, India. snatarajan@iisc.ac.in.
Abstract:
New compounds, M2.5T0.5(O2BO3) and (M2T)(O2BO3) (M = Co, Ni, Cu; T = Ti, Sn, Fe) stabilised with the ludwigite structure, were prepared employing conventional solid-state methods and their structures were determined by powder X-ray diffraction (PXRD) studies. Room temperature Raman spectroscopic studies were consistent with the various polyhedral building units in the structure. Some of the prepared compounds exhibited colors that are different from the normally expected colors for the transition metal ions having octahedral coordination. The observed colors were explained with the help of allowed d-d transitions and metal-to-metal charge transfer (MMCT) transitions. Magnetic studies were carried out on the Co5Ti(O2BO3)2, (Co2.5Ni2.5)Ti(O2BO3)2, (Co2.5Ni2.5)Sn(O2BO3)2, and (CoNi)Fe(O2BO3) compounds, which indicated that the compounds exhibit antiferromagnetic behavior. The compounds M2.5T0.5(O2BO3) and (M2T)(O2BO3) (M = Co, Ni, Cu; T = Ti, Sn, Fe) were evaluated for the oxygen evolution reaction (OER). The investigated compounds exhibited good electrocatalytic performance comparable to that of RuO2. XPS studies confirmed the presence and oxidation states of the different transition elements in the compounds. Electronic structure calculations using density functional theory support the findings of the experimental observations. The present study demonstrates the versatility of these mineral structures as a platform for investigating a wide range of material properties.
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