Die Kristallstruktur von Fe2Si, ihre Verwandtschaft zu den Ordnungsstrukturen des α-(Fe,Si)-Mischkristalls und zur Fe5Si3-Struktur
Abstract
There have been taken high-temperature photographs from powders of the high-temperature phase Fe2Si. 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 = 5.0855 ± 0.0025 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 Fe5Si3 structure.
After quenching one finds a D03 type with a = 5.61 ± 0.02 Å = 2 × (2.805 ± 0.01) Å showing a short range period of τ = 8.51 ± 0.17 Å = 3 × (2.84 ± 0.06) Å.
At high temperatures the Fe2Si phase demands more space than those α-(Fe,Si) crystals with slightly lower silicon concentrations. At room temperature on the contrary a contraction is found.
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Articles in the same Issue
- The crystal structure of germanium dibromide*
- Quadratischer elektrostriktiver Tensor des rhombischen Calciumformiats
- Die Kristallstruktur von Fe2Si, ihre Verwandtschaft zu den Ordnungsstrukturen des α-(Fe,Si)-Mischkristalls und zur Fe5Si3-Struktur
- The behaviour of triplet relationships in the case of a small number of atoms in the unit cell
- The adjunction of antiidentity operations to point groups, including a derivation of the magnetic point groups
- Clinoptilolite: the distribution of potassium atoms and its role in thermal stability
- Die Kristallstruktur von (+)- und (−)-Ru[C6H5(CH3)PCH2CH2,P(C6H5)CH3],Cl2
- Zur Kompensation der elektrostatischen Kräfte bei der Messung elektrooptischer Effekte
- Tables of the Σ1 relationships: triclinic, monoclinic and orthorhombic space groups
- The crystal structure of C.I. Pigment Red 6, 4-chloro-2-nitrophenylazo-2-naphthol
- Madelung constants for millerite-type structures and for high-pressure GeP-type structures: a contribution to the crystal chemistry of A[5]B[5] compounds
- The crystal structures of α and γ SrUO4
- On the use of Guinier-Hägg film data for structure analysis
