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Variants of the X ‐phase in the Mn–Co–Ge system
Author(s) -
Shtender Vitalii,
Larsen Simon R.,
Sahlberg Martin
Publication year - 2021
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229621002370
Subject(s) - orthorhombic crystal system , intermetallic , crystallography , diffraction , materials science , chemical composition , phase (matter) , manganese , crystal structure , homogeneity (statistics) , x ray crystallography , chemistry , metallurgy , alloy , physics , statistics , mathematics , organic chemistry , optics
We report two new variants of the X ‐phase (orthorhombic, space group Pnnm ) derived from the Mn–Co–Ge system. Two compositionally related crystals were investigated by means of single‐crystal X‐ray diffraction (XRD) and energy dispersive spectroscopy (EDS). The Mn 14.9 Co 15.5 Ge 6.6 and Mn 14 Co 16.2 Ge 6.8 intermetallic compounds are part of the homogeneity region of the X ‐phase and adopt the Mn 14 (Mn 0.11 Co 0.64 Si 0.25 ) 23 structure type. The composition obtained from refinement of the XRD data is in agreement with the EDS results. In the present study, chemical disorder was only detected on the 8 h positions. The ordering is compared with other members of the X ‐phase family and shows that the degree of disordering depends on the chemical composition. No completely ordered variants of the X ‐phase have yet been reported.