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- W2061374541 abstract "The experimental electron-density distribution of potassium iron disulfide, ${mathrm{KFeS}}_{2}$, has been determined from high-resolution single-crystal x-ray intensity measurements collected with Ag Kensuremath{alpha} radiation to a resolution of (sinensuremath{theta})/ensuremath{lambda}=1.30 A${r{}}^{mathrm{ensuremath{-}}1}$. The structure of ${mathrm{KFeS}}_{2}$ consists of parallel chains of edge-sharing ${mathrm{FeS}}_{4}$ tetrahedra extending along the c-axis. In addition to the conventional structural parameters, multipole deformation functions and third- and fourth-cumulant anharmonic thermal parameters were included in some least-squares refinements. In all cases, inclusion of anharmonic thermal vibration parameters yielded significantly better fits to the x-ray data. From the experimental multipole population parameters of the iron atom, apparent d-orbital occupancies and the number of unpaired 3${d}_{ensuremath{uparrow}}$ electrons have been estimated within the crystal-field approximation and the assumption that a minimal basis set of atomic d orbitals is adequate for the d electrons. The values obtained for the number of 3${d}_{ensuremath{uparrow}}$ electrons from various refinements of the x-ray data agree well with values deduced from previous magnetic-susceptibility measurements and from theoretical calculations. The crystal-field splitting of the iron d orbitals and the ensuing asphericity is clearly evident in the experimental electron-density maps. The electric field gradient at the iron nucleus, calculated from the x-ray multipole parameters due to the slightly distorted (${D}_{2d}$) tetrahedral crystal field, predicts a quadrupole splitting of ensuremath{Delta}${E}_{mathrm{QS}=3.3(10}$) mm/sec, somewhat larger than observed in Mossbauer experiments (ensuremath{Delta}${E}_{mathrm{QS}=0.53}$ mm/sec). The major contribution to the electric field gradient comes from the valence-electron distribution, which is consistent with the observed asphericity of electron density around iron." @default.
- W2061374541 created "2016-06-24" @default.
- W2061374541 creator A5022647638 @default.
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- W2061374541 date "1988-01-15" @default.
- W2061374541 modified "2023-09-27" @default.
- W2061374541 title "Experimental electron-density-distribution study of potassium iron disulfide, a low-dimensional material" @default.
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- W2061374541 doi "https://doi.org/10.1103/physrevb.37.1109" @default.
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