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Crystal structure and thermal expansion of Mn 1− x Fe x Ge
Author(s) -
Dyadkin Vadim,
Grigoriev Sergey,
Ovsyannikov Sergey V.,
Bykova Elena,
Dubrovinsky Leonid,
Tsvyashchenko Anatoly,
Fomicheva L.N.,
Chernyshov Dmitry
Publication year - 2014
Publication title -
acta crystallographica section b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.604
H-Index - 33
ISSN - 2052-5206
DOI - 10.1107/s2052520614006611
Subject(s) - thermal expansion , neutron diffraction , materials science , powder diffraction , diffraction , crystallography , debye model , single crystal , phase transition , x ray crystallography , debye , crystal structure , atmospheric temperature range , phase (matter) , crystal (programming language) , solid solution , analytical chemistry (journal) , condensed matter physics , chemistry , thermodynamics , optics , physics , programming language , organic chemistry , chromatography , computer science , metallurgy
A series of temperature‐dependent single‐crystal and powder diffraction experiments has been carried out using synchrotron radiation in order to characterize the monogermanides of Mn, Fe and their solid solutions. The MnGe single crystal is found to be enantiopure and we report the absolute structure determination. The thermal expansion, parametrized with the Debye model, is discussed from the temperature‐dependent powder diffraction measurements for Mn 1− x Fe x Ge ( x = 0, 0.1, 0.2, 0.25, 0.3, 0.4, 0.5, 0.6, 0.7, 0.75, 0.8, 0.9). Whereas the unit‐cell dimension and the Debye temperature follow a linear trend as a function of composition, the thermal expansion coefficient deviates from linear dependence with increasing Mn content. No structural phase transformations have been observed for any composition in the temperature range 80–500 K for both single‐crystal and powder diffraction, indicating that the phase transition previously observed with neutron powder diffraction most probably has a magnetic origin.