Abstract
General formulation for the Mean-Field and Effective-Field theories, with correlations, on the Ising model spin-1/2, were derived to describe the switching properties between the LS and HS states in SCO nanoparticles, with objective of present a new theoretical approach on the spin-crossover materials. These two methods were applied on the Ising spin-1/2 model in a 3D spin crossover nanoparticle. By applying the Mean-Field theory and Effective-Field theory in this way, we have solved a set of coupled equations that correlates the averages of the spins located at the edge (σE), corner (σC), surface (σS) and bulk (σB), present in a lattice of SCO nanoparticles. Besides the magnetizations and thermal evolution of the HS molar fraction, we have obtained some phase diagrams and free energies of the system.
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