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Pressure induced re-entrant order-disorder like structural phase transition in spinel ferrite nanoparticles

The effect of isotropic compression on the nanoparticles of Zinc ferrite (ZnFe2O4) compound (∼10 nm) are studied using pressure dependent Raman spectroscopy. The Raman spectra showed new spectral lines in the pressure range of 0.39-3 GPa indicating lowering of symmetry. The nanoparticles showed pressure induced structural phase transition from cubic to orthorhombic structural phase at ∼0.4 GPa which is significantly less than 24 GPa where bulk material shows such transition. It is shown that very small values of the pressure introduces large disorder at the tetrahedral site pushing the system towards lower symmetry phase. At higher pressure values (>3 GPa) the new Raman modes disappears indicating back transformation of the system to the high symmetry state. The mixed spinel cubic structure (disorder state) transforms to the inverted spinel structure (ordered state) through an orthorhombic crystal structure (large disorder state) as a function of increasing pressure.The effect of isotropic compression on the nanoparticles of Zinc ferrite (ZnFe2O4) compound (∼10 nm) are studied using pressure dependent Raman spectroscopy. The Raman spectra showed new spectral lines in the pressure range of 0.39-3 GPa indicating lowering of symmetry. The nanoparticles showed pressure induced structural phase transition from cubic to orthorhombic structural phase at ∼0.4 GPa which is significantly less than 24 GPa where bulk material shows such transition. It is shown that very small values of the pressure introduces large disorder at the tetrahedral site pushing the system towards lower symmetry phase. At higher pressure values (>3 GPa) the new Raman modes disappears indicating back transformation of the system to the high symmetry state. The mixed spinel cubic structure (disorder state) transforms to the inverted spinel structure (ordered state) through an orthorhombic crystal structure (large disorder state) as a function of increasing pressure.