Ceramic composites of the mixed system (BaTiO 3 ) x (NiFe 2 O 4 ) 1¡x (x D 1, 0.8, 0.65, 0.6, 0.5, 0.2, 0) have been prepared by hydrothermal synthesis and characterized through dielectric and magnetic measurements. It is shown that, when compared with the first-order phase transition of pure BaTiO 3 , the ferroelectric response of this mixed system is dramatically smeared by the presence of ferrite and eventually disappears around x % 0.65. The peak of the dielectric constant becomes increasingly smoothed with composition, also diminishing its maximum value as the frequency increases. Moreover, the magnetic behavior is not suppressed by the presence of the ferroelectric perovskite and just qualitative changes occur in the hysteresis parameters on the whole compositional range.
Two‐dimensional Ising models are used to explain the disorder effects in mixed solid solutions and doped relaxor systems. On ferro‐ferro solutions like Pb(Zr1‐xTix)O3 (PZT), the composition dependence of the Curie temperature TC(x) usually deviates from the averaged linear behavior known as the Vegard's law. This deviation is mimicked by a Hamiltonian model including interactions between different types of dipoles in a two dimensional lattice. Doping PZT with lanthanum (PLZT) results in a relaxor behavior that is explained by adding a new term to 2D Ising model that takes into account the interaction between dipoles and itinerant charges.
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