Relationships between covalency, interatomic distances, and magnetic properties in halides and chalcogenides

  • R. D. Shannon
  • H. Vincent
Conference paper
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Part of the Structure and Bonding book series (STRUCTURE, volume 19)

Abstract

A “covalency contraction” parameter, R v , is defined as the ratio of the until cell volume of a transition metal compound MmXn relative to the unit cell volume of MgmXn. This parameter is found to be proportional to the electronegativity of X and thus inversely proportional to the degree of covalence of the M-X bond. The paraemter R v explains the relative differences in cell volumes (V) for certain pairs of isotopic compounds, e.g., V(FeO) is larger than V(MgO), but V(Fe2GeS4) is smaller than V(Mg2GeS4). Similar but smaller variations in R v occur in ternary oxides MxYyOz and can be traced to the covalence of the Y-O bond. Approximately linear relationships exist between R v and spin-transfer coefficients determined for Ni2+, Co2+ and Mn2+ from magnetic resonance and neutron diffraction methods, and between R v and the Mössbauer isomer shift for Fe2+. The differences in spin transfer observed for MnO and MnCO3 are consistent with the differences in R v for the two compounds.

Keywords

Interatomic Distance Isomer Shift Unit Cell Volume Covalent Radius Spin Transfer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer Verlag 1974

Authors and Affiliations

  • R. D. Shannon
    • 1
  • H. Vincent
    • 2
  1. 1.Central Research Department E. I. du Pont de Nemours & Co. WilmingtonUSA
  2. 2.Laboratoire des Rayons X - CERNS B. P. N0 166Centre de Tri 38042Grenoble CedexFrance

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