Preparation, structure and dielectric properties of composites based on Ni <sub>0.7</sub>Zn <sub>0.3</sub>Fe <sub>2</sub>O <sub>4</sub> and (Na, Li, Sr)NbO <sub>3</sub>
Magnetoelectric composites of 0.6(Ni 0.7Zn 0.3Fe 2O 4) / 0.4((Na, Li, Sr)NbO 3+MnO 2) are prepared by conventional ceramic technology. The effect of composite sintering temperature on their phase composition and structure is studied. It is stated that the composites obtained are two phase systems (perovskite and spinel). It is established that modulation of spinel structure is shown more accurately at low sintering temperatures (1180 оC), while modulation of perovskite structure is shown at high temperatures (1220 оC). The discovered modulations of perovskite and spinel structures are assumed be connected with extended defects such as crystallographic shear planes. Increasing of composite sintering temperature (T sint ³ 1200 оC) was shown to lead to the disappearance of an impurity phase and the change of perovskite phase composition, as well as the increase of relative dielectric constant.