Open AccessStoichiometry of tetragonal and hexagonal FexSe: phase relations
Author(s) -
Mahboobeh Shahbazi,
Henrietta E. Cathey,
Ian D.R. Mackin
Publication year - 2020
Publication title -
superconductor science and technology/superconductor science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.033
H-Index - 105
eISSN - 1361-6668
pISSN - 0953-2048
DOI - 10.1088/1361-6668/ab89ec
Subject(s) - materials science , tetragonal crystal system , phase diagram , annealing (glass) , stoichiometry , analytical chemistry (journal) , hexagonal crystal system , phase (matter) , sintering , hexagonal phase , crystallography , grain size , microstructure , crystal structure , metallurgy , chemistry , organic chemistry , chromatography
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-Fe x Se and δ-Fe x Se for 1.02 < x < 0.90 and a second two phase field with β-Fe x Se 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.