Abstract
A new solid solution of CoTiO3 in Bi1/2Na1/2TiO3 materials was synthesized by sol-gel technique. The solution of CoTiO3 into host Bi1/2Na1/2TiO3 materials resulted in reduction of the optical band gap and induced complex magnetic properties at room temperature. It is experimentally evident that the observed magnetism is possibly originated from the random incorporation of Co cations into the Ti-site vacancy in Bi1/2Na1/2TiO3 and is enhanced via Na vacancies. From our first-principles calculations, the underlying mechanism of the induced magnetism in the Ti-site Co-doped Bi1/2Na1/2TiO3 is the interplay of the unpaired electron counts of Co cations, including Co2+ and Co3+ ions, in the crystal field and Jahn–Teller effect. This work proposes a flexible method to achieve ferromagnetism at room temperature in ilmenite-modified Bi1/2Na1/2TiO3 materials.
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