ELECTRIC AND MAGNETIC PROPERTIES OF Co0.6Zn0.4Fe1.7Mn0.3O4 doped (0.94(Bi0.5Na0.5TiO3)-0.06BaTiO3) CERAMICS PREPARED BY THE SOLID-STATE COMBUSTION METHOD
DOI:
https://doi.org/10.55766/sujst10703Keywords:
BNBT, CZFM, Combustion method, Ferroelectric, FerromagneticAbstract
In this research paper, we fabricated (1-x)[0.94(Bi0.5Na0.5TiO3)-0.06BaTiO3]-x Co0.6Zn0.4Fe1.7Mn0.3O4 [(1-x)BNBT-xCZFM] ceramics at x = 0, 0.05, 0.10, 0.15, and 0.20 via a method of solid-state combustion. Dielectric, ferroelectric, magnetic, microstructure, and phase formation characteristics were investigated. The BNBT and the CZFM powders were calcined separately at 750°C for 2 h, then their powders were mixed to produce (1-x)BNBT-xCZFM solid solutions with different BNBT and CZFM ratios and sintered at 1,125°C for 2 h. The X-ray diffraction results showed that undoped BNBT ceramics have a typical perovskite structure, with rhombohedral (R) and tetragonal (T) phases coexisting. As the CZFM concentration rose, the ceramics exhibited coexisting rhombohedral (R), tetragonal (T) perovskite, and cubic (C) spinel phases. When x rose from 0 to 0.05, the average grain size of the ceramics greatly increased, while the density and dielectric constant (e) slightly decreased. When x raised from 0.05 to 0.15, average grain size, density and the dielectric constant (e) of the ceramics tended to increase, then they dropped as the CZFM content increased further. CZFM doping into BNBT ceramics reduced the ferroelectric properties by reducing the remnant polarization (Pr) and increasing the EC values and leakage current. CZFM doping into BNBT ceramics with x = 0.15 and 0.20 showed both typical of ferromagnetic and ferroelectric properties.
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