title: Crystal structure and thermal expansion of Mn(1-x)Fe(x)Ge.
abstract: 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.
authors: Swiss-Norwegian Beamlines at the European Synchrotron Radiation Facility, 38000 Grenoble, France.
authors: Vadim
authors: V
authors: Dyadkin
authors: Petersburg Nuclear Physics Institute, 188300 Gatchina, Saint-Petersburg, Russia.
authors: Sergey
authors: S
authors: Grigoriev
authors: Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany.
authors: Sergey V
authors: SV
authors: Ovsyannikov
authors: Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany.
authors: Elena
authors: E
authors: Bykova
authors: Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany.
authors: Leonid
authors: L
authors: Dubrovinsky
authors: Institute for High Pressure Physics, Russian Academy of Sciences, 142190 Troitsk, Moscow, Russia.
authors: Anatoly
authors: A
authors: Tsvyashchenko
authors: Institute for High Pressure Physics, Russian Academy of Sciences, 142190 Troitsk, Moscow, Russia.
authors: L N
authors: LN
authors: Fomicheva
authors: Swiss-Norwegian Beamlines at the European Synchrotron Radiation Facility, 38000 Grenoble, France.
authors: Dmitry
authors: D
authors: Chernyshov
keywords: monogermanides; powder diffraction; thermal expansion