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Structure and Electronic Properties of Transition Metal Doped Kaolinite Nanoclay.

In this work, a series of transition metal (Cr, Mn, Fe, and Co) doped kaolinite nanoclays were investigated by density functional theory (DFT) calculations. The influence of metal doping on geometric structure and electronic structure of kaolinite was analyzed. The ferromagnetic (FM), antiferromagnetic (AFM), and nonmagnetic (NM) states of transition metal (TM) doped kaolinite structures were studied. The crystal volume, lattice parameters, bond length, charge, and spin were calculated by dispersion-corrected density functional theory (DFT-D2). The results indicated that Cr(3+) and Fe(3+) dopants showed more stable under AFM state, while Mn(3+) preferred both AFM and FM states, and Co(3+) dopant preferred NM state. Also, the transition metal doping could induce lattice volume expansion and some dopant states in the band gap.

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