Thermal response of the iron-based Ba122 superconductor to in situ and ex situ processes

The thermal properties are one of the key parameters to control phase purity and microstructure of polycrystalline materials. The melting point of the iron-based BaFe2As2 superconductor (Ba122), which foresees high-field applications, remains controversial. In this work, thermogravimetry-differentia...

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Bibliographic Details
Published inSuperconductor science & technology Vol. 34; no. 3; pp. 34004 - 34009
Main Authors Tokuta, Shinnosuke, Yamamoto, Akiyasu
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.03.2021
Subjects
formation temperature
iron-based superconductor
melting point
TG-DSC
thermal analysis
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Summary:The thermal properties are one of the key parameters to control phase purity and microstructure of polycrystalline materials. The melting point of the iron-based BaFe2As2 superconductor (Ba122), which foresees high-field applications, remains controversial. In this work, thermogravimetry-differential scanning calorimetry measurements (TG-DSC) of undoped and Co-doped Ba122 were carried out. Mixtures of elemental metals and pre-reacted Ba122 powders were prepared to investigate the thermal responses during in situ and ex situ synthesis routes, respectively. In addition, the phases and microstructures of the quenched samples were evaluated to elucidate the observed exothermic/endothermic peaks. Our results suggest that the melting point of Ba122 is ∼1300 °C.
Bibliography:SUST-104046.R2
ISSN:0953-2048
1361-6668
DOI:10.1088/1361-6668/abda5e