Stoichiometry of tetragonal and hexagonal FexSe: phase relations

Precise compositional analyses at spatial resolution 690 °C with annealing at 420 °C for ∼24 h. We define a modified phase diagram that includes this two phase field with β-FexSe and δ-FexSe for 1.02 < x < 0.90 and a second two phase field with β-FexSe and α-Fe for 1.08 < x < 1.02. This...

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Bibliographic Details
Published in:Superconductor science & technology 2020-07, Vol.33 (7)
Main Authors: Shahbazi, Mahboobeh, Cathey, Henrietta E, Mackinnon, Ian D R
Format: Article
Language:English
Subjects:
iron chalcogenides
microstructure
phase diagram
stoichiometry
superconductivity
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Summary:Precise compositional analyses at spatial resolution 690 °C with annealing at 420 °C for ∼24 h. We define a modified phase diagram that includes this two phase field with β-FexSe and δ-FexSe for 1.02 < x < 0.90 and a second two phase field with β-FexSe and α-Fe for 1.08 < x < 1.02. This revised phase diagram for Fe:Se ∼ 1.0 suggests that the peretectic transition nominally identified at x = 1.04 is not evident.
ISSN:0953-2048
1361-6668
DOI:10.1088/1361-6668/ab89ec