Journal
NANOMATERIALS
Volume 12, Issue 21, Pages -Publisher
MDPI
DOI: 10.3390/nano12213714
Keywords
strontium hexaferrite; GTR mechanism; phase transformation
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This paper investigates the phase transformation in a gaseous heat treatment and re-calcination process using methane for preparing nanocrystalline Sr-hexaferrite powder. The transformation path during the process is clarified by a phase transformation map, which shows the different intermediate phases and their effects on the phase composition and physical properties of the powder.
In this paper, the phase transformation in a gaseous heat treatment and re-calcination (GTR) process for preparing nanocrystalline Sr-hexaferrite powder using methane (CH4) was studied. The process included gaseous heat treatment and subsequent re-calcination. Phase composition of the powder and its physical properties were changed significantly owing to formation of different intermediate phases. Sr-hexaferrite powder was prepared by the conventional route as the precursor. The results were represented in a phase transformation map that showed the intermediate phases and clarified the transformation path during the process. As evidenced by the map, the process had four general stages: decomposition of hexaferrite, reduction of iron oxides to pure iron, re-oxidation of iron, and re-formation of hexaferrite with different properties and structure.
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