Different Stages of Phase Transformation in the Synthesis of Nanocrystalline Sr-Hexaferrite Powder Prepared by a Gaseous Heat Treatment and Re-Calcination Method

Dehghan, RaminUniv Tehran, Adv Magnet Mat Res Ctr, Sch Met & Mat, Tehran 111554563, Iran. (författare)

QC 20221205
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.

Ebrahimi, Seyyed Ali SeyyedUniv Tehran, Adv Magnet Mat Res Ctr, Sch Met & Mat, Tehran 111554563, Iran. (författare)
Lalegani, ZahraUniv Tehran, Adv Magnet Mat Res Ctr, Sch Met & Mat, Tehran 111554563, Iran. (författare)
Hamawandi, Bejan,PhDKTH,Biomedicinsk fysik och röntgenfysik(Swepub:kth)u1g24thw (författare)
Univ Tehran, Adv Magnet Mat Res Ctr, Sch Met & Mat, Tehran 111554563, Iran.Biomedicinsk fysik och röntgenfysik (creator_code:org_t)

Av författaren/redakt...: Dehghan, Ramin; Ebrahimi, Seyyed ...; Lalegani, Zahra; Hamawandi, Bejan ...

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