Abstract
Aurivillius-type ceramics Bi6Fe2−xMnxTi3O18x = 0, 0.3, 0.9, 1.5 were obtained by a solid-state reaction method using high-purity TiO2, Bi2O3, Fe2O3 and Mn2O3 powders. The milled powder was calcined at 1113 K for 4 h. After calcination, the powder was milled again than pressed into pellets and sintered at 1213 K for 4 h. It was detected that the addition of manganese ions to the multiferroic five-layer Aurivillius-type structure affects the size of the grains. It was found that, the certain amount of manganese ions causes that the polarization of the material doped by them, have the direction opposite to the direction of the applied electric field. The doped material behaves like dia-electric material. The presented research complements the research concerning the Aurivillius ceramics doped with manganese. An attempt was made to explain the reasons for the negative values of dielectric constant and dielectric loss, that occur in manganese-doped five-layer Aurivillius type ceramics and which have not been described in the literature so far.
Highlights
Multiferroics are materials in which at the same phase there are at least two ferroic features, i.e., ferroelectricity, ferromagnetism or ferroelasticity
Magnetoelectric multiferroic materials, which belong to the so-called bismuth oxides with perovskite-like layered structures, arouse great interest.The first description of perovskite-like layered structures was given by Aurivillius, often such materials are called Aurivillius phases [3]
The subject of investigations that was presented in this paper were compounds which represent a structure with the unit cell consisting of one bismuth oxide layer (Bi2O2)2+ and five perovskite layers (Am−1BmO3m+1)2− with a general chemical formula: B i5Fe2−xMnxTi3O18, where x = 0, 0.3, 0.9, 0.15
Summary
Multiferroics are materials in which at the same phase there are at least two ferroic features, i.e., ferroelectricity, ferromagnetism or ferroelasticity. The most interesting due to their potential applications are magnetoelectric multiferroic materials, i.e., materials that exhibit both magnetic and electrical properties. An interesting material with an Aurivillius-type structure is five-layer Bi5Fe2−xMnxTi3O18 material doped with manganese This material with 0 ≤ x ≤ 0.8 the first time was obtained by Zuo et al [12]. The subject of investigations that was presented in this paper were compounds which represent a structure with the unit cell consisting of one bismuth oxide layer (Bi2O2)2+ and five perovskite layers (Am−1BmO3m+1)2− with a general chemical formula: B i5Fe2−xMnxTi3O18, where x = 0, 0.3, 0.9, 0.15. In this paper was presented conditions of the technological process of obtaining Aurivillius-type ceramics and results of researches the effect of manganese doping on its microstructure and dielectric properties
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