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Microstructural evolution during gaseous heat treatment and re-calcination of Sr-hexaferrite for magneto optical purposes.

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Bibliographic Details
Title: Microstructural evolution during gaseous heat treatment and re-calcination of Sr-hexaferrite for magneto optical purposes.
Authors: Dehghan, R.1 (AUTHOR), Seyyed Ebrahimi, S.A.1 (AUTHOR) saseyyed@ut.ac.ir, Lalegani, Z.1 (AUTHOR)
Source: Ceramics International. Sep2025:Part A, Vol. 51 Issue 21, p33477-33492. 16p.
Subjects: Optical disk drives, Heat treatment, Phase transitions, Data warehousing, Magneto
Abstract: Sr-hexaferrite demonstrates pronounced magneto-optical characteristics that render it highly advantageous for utilization in electronic apparatus. Furthermore, the magneto-optical attributes of Sr-hexaferrite are essential for implementation in data storage and optical devices, which are sensitive to the microstructure of material. In this work, a systematic study on the morphological changes during gaseous heat treatment and re-calcination (GTR) of Sr-hexaferrite was performed to make the ability to manipulate the structure to achieve the desired properties. For this purpose, the Sr-hexaferrite powder was synthesized by conventional method and then subjected to gaseous heat treatment and re-calcination process. The phase transformations in the GTR process occurred in three stages of: decomposition of Sr-hexaferrite, reduction of iron oxides and a re-calcination. Along with phase investigations, the morphological transformations were investigated using FE-SEM analysis and a model for phase transformation was presented for each stage. For validation of proposed model, EDS analysis was performed. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Sr-hexaferrite demonstrates pronounced magneto-optical characteristics that render it highly advantageous for utilization in electronic apparatus. Furthermore, the magneto-optical attributes of Sr-hexaferrite are essential for implementation in data storage and optical devices, which are sensitive to the microstructure of material. In this work, a systematic study on the morphological changes during gaseous heat treatment and re-calcination (GTR) of Sr-hexaferrite was performed to make the ability to manipulate the structure to achieve the desired properties. For this purpose, the Sr-hexaferrite powder was synthesized by conventional method and then subjected to gaseous heat treatment and re-calcination process. The phase transformations in the GTR process occurred in three stages of: decomposition of Sr-hexaferrite, reduction of iron oxides and a re-calcination. Along with phase investigations, the morphological transformations were investigated using FE-SEM analysis and a model for phase transformation was presented for each stage. For validation of proposed model, EDS analysis was performed. [ABSTRACT FROM AUTHOR]
ISSN:02728842
DOI:10.1016/j.ceramint.2025.05.079