X-ray powder diffraction and electron diffraction studies of the Ni1±yGe1−xPx system |
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| Authors: | F. Javier Garcí a-Garcí a |
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| Affiliation: | a Arrhenius Laboratory, Department of Inorganic Chemistry, Stockholm University, 106 91 Stockholm, Sweden
b Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia |
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| Abstract: | The wide-range of non-stoichiometric NiAs-type solid solution Ni1±yGe1−xPx has been studied by means of X-ray powder and electron diffraction. The incommensurately modulated structure of Ni(Ge, P) has been found to exist over a wide compositional range which is limited by the end points ≈NiGe0.8P0.2 and NiGe0.3P0.7 so that the general stoichiometry might be referred to as NiGe1−xPx with 0.2?x?0.7. The modulation wave vector is of the type  and its modulus is strongly composition dependent. A possible interpretation is given as a “soft transition”, via an incommensurately modulated structure, between the MnP and the NiP structure types, based on the almost purely displacive origin of the distortion. Further, the crystal structures of Ni5Ge2P3 and Ni2GeP seem to be commensurate approximations of the incommensurate modulated structure of Ni(Ge, P). |
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| Keywords: | Ni-Ge-P ternary system Modulated NiAs-type structure Electron diffraction X-ray powder diffraction Superstructure Displacive distortion |
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