Structure and Dielectric Properties of Bi1 – xSmxFeO3 Nanostructured Ceramics

Resumo

Structure and dielectric properties of polycrystalline multiferroics of Bi_1 – xSm_xFeO₃ (x = 0–0.2) system are studied. Using X-ray diffraction, two coexisting phases (rhombohedral R3c and orthorhombic Pbam) are found in the nanostructured sample with x = 0.1. Four anomalies characteristic for phase transitions are found near temperatures of ~180, 250, 300°C and T_N at ~350°C on temperature dependences of permittivity ε'(T). It is shown that when samarium content is increased, the permittivity ε' grows and tanδ decreases.