Abstract
The structural phase transition materials have important applications due to their properties which greatly vary with higher annealing temperatures. Mg0.1Sr0.1Mn0.8Fe2O4 nanoparticles were synthesized by co-precipitation method and annealed at different temperatures. The structural phase of these nanoferrites was transformed from cubic spinel for T ≤ 500 °C to Z-type hexagonal for T ≥ 600 °C. This transformation process was attributed to Jahn-Teller effect of the Mn3+ ions and/or atomic disorder existed in the crystal lattice. The obtained spectra and parameters for the samples were affected by the transformation process. The lattice constants, experimental and theoretical densities, porosity, unit cell volume, grain and crystallite sizes, strain, specific surface area, distortion and dislocation parameters, inter-chain distance, IR band positions and force constants, Debye temperature, threshold frequency, magnetic properties, hyperfine magnetic fields, A- and B-site line widths, area ratio of B- to A-sites, Poison ratio, stiffness constants, Young's, rigidity and bulk moduli were strongly dependent on T. The cation distribution was estimated.
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