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There have been taken high-temperature photographs from powders of the high-temperature phase Fe 2 Si. From a 1062 ± 10°C photograph the positions of the diffraction lines could be calculated with the hexagonal constants  a  = 4.052 ± 0.002 Å,  c  = 5.085 5  ± 0.002 5  Å,  c / a  = 1.255, which are equivalent to the rhombohedral values  a  = 8.667 Å = 3 × 2.889 Å,  ϱ  = 89.06Å. Calculations of diffraction intensities prove a lattice which is in close relation with the states of order in the  α -(Fe,Si) mixed-crystal series with the filled NiAs type and with the Fe 5 Si 3  structure.

Die Kristallstruktur von Fe 2 Si, ihre Verwandtschaft zu den Ordnungsstrukturen des α -(Fe,Si)-Mischkristalls und zur Fe 5 Si 3 -Struktur