X-ray powder diffraction and electron diffraction studies of the Ni 1±yGe1-xPx system

F. Javier García-García; A. K. Larsson

doi:10.1016/j.jssc.2004.10.040

X-ray powder diffraction and electron diffraction studies of the Ni _1±yGe_1-xP_x system

F. Javier García-García
, A. K. Larsson^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

The wide-range of non-stoichiometric NiAs-type solid solution Ni _1±yGe_1-xP_x 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 ≈NiGe _0.8P_0.2 and NiGe_0.3P_0.7 so that the general stoichiometry might be referred to as NiGe_1- _xP_x with 0.2≤x≤0.7. The modulation wave vector is of the type q=γ[112̄0]* 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).

Original language	English
Pages (from-to)	742-754
Number of pages	13
Journal	Journal of Solid State Chemistry
Volume	178
Issue number	3
DOIs	https://doi.org/10.1016/j.jssc.2004.10.040
Publication status	Published - Mar 2005

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10.1016/j.jssc.2004.10.040

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@article{90faef054aad4b43a348cc6c41e75819,

title = "X-ray powder diffraction and electron diffraction studies of the Ni 1±yGe1-xPx system",

abstract = "The wide-range of non-stoichiometric NiAs-type solid solution Ni 1±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 ≈NiGe 0.8P0.2 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 q=γ[11{\=2}0]* 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).",

keywords = "Displacive distortion, Electron diffraction, Modulated NiAs-type structure, Ni-Ge-P ternary system, Superstructure, X-ray powder diffraction",

author = "Garc{\'i}a-Garc{\'i}a, \{F. Javier\} and Larsson, \{A. K.\}",

year = "2005",

month = mar,

doi = "10.1016/j.jssc.2004.10.040",

language = "English",

volume = "178",

pages = "742--754",

journal = "Journal of Solid State Chemistry",

issn = "0022-4596",

publisher = "Academic Press Inc.",

number = "3",

}

TY - JOUR

T1 - X-ray powder diffraction and electron diffraction studies of the Ni 1±yGe1-xPx system

AU - García-García, F. Javier

AU - Larsson, A. K.

PY - 2005/3

Y1 - 2005/3

N2 - The wide-range of non-stoichiometric NiAs-type solid solution Ni 1±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 ≈NiGe 0.8P0.2 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 q=γ[112̄0]* 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).

AB - The wide-range of non-stoichiometric NiAs-type solid solution Ni 1±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 ≈NiGe 0.8P0.2 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 q=γ[112̄0]* 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).

KW - Displacive distortion

KW - Electron diffraction

KW - Modulated NiAs-type structure

KW - Ni-Ge-P ternary system

KW - Superstructure

KW - X-ray powder diffraction

UR - https://www.scopus.com/pages/publications/17744382584

U2 - 10.1016/j.jssc.2004.10.040

DO - 10.1016/j.jssc.2004.10.040

M3 - Article

SN - 0022-4596

VL - 178

SP - 742

EP - 754

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

IS - 3

ER -

X-ray powder diffraction and electron diffraction studies of the Ni _1±yGe_1-xP_x system

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