Synthesis, Structure and Properties of Barium Ferrites BaFe₁₁M₁O19 (M= Al, Ti and Mn) Ceramics

Abstract:

The article shows the results of a research in which barium hexaferrite samples of the BaFe₁₁M₁O₁₉ (M= Al, Ti and Mn) composition were obtained by solid-state synthesis. Samples substituted with titanium, aluminum, and manganese were obtained in a tubular furnace at an exposure time of 5 hours at a temperature of 1350°C, the sample, substituted with manganese, it was obtained at a temperature of 1250°C. The chemical composition was controlled using electron microscopy the samples obtained correspond to the initial composition with sufficient accuracy. Hexagonal plates represent the structure of all the obtained samples. According to X-ray phase analysis, all samples are monophasic and have the structure of barium hexaferrite. Using the data of powder X-rays, the parameters of the unit cell of the studied samples were calculated, when iron atoms are substituted by titanium or aluminum or manganese atoms, the crystal lattice is distorted, while its change is not the same for different crystallographic directions. During the doping of barium hexaferrite with titanium, aluminum or manganese atoms, the Curie temperature decreases. This is due to a decrease in the exchange interaction forces during the modification of the barium hexaferrite matrix. The aim of this study was to study the structure and change of the lattice parameters, the Curie temperature, depending on the substitution element.

• Periodical: Materials Science Forum (Volume 1052)
• Pages: 172-177
• DOI: https://doi.org/10.4028/p-3uh7h3
• Online since: February 2022
• Authors: K.P. Pavlova*, I.A. Solizoda, Denis Vinnik
• Keywords: Aluminum, Barium Hexaferrite, Manganese Ceramics, Solid-State Synthesis, Substitution of Iron with Titanium

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