Structure of the Commensurate Phase P'' of Wüstite Fe0.902O Studied by High Resolution Electron Microscopy
- 1 September 1985
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 24 (9A) , L723
- https://doi.org/10.1143/jjap.24.l723
Abstract
Atomic level observations have been made of the commensurate phase P'' of Fe0.902O. In the ideal state, the crystal structure is monoclinic with lattice parameters a=b=\frac{5}{2} √2a 0, c=5a 0 and γ=90^°, and belongs to the space group P21/m. Here, a 0 is the lattice parameter of the fundamental cell taking the NaCl type of structure. The unit cell contains four iron vacancy clusters, each of which is made of two vacancy tetrahedra with a common edge and contains no tetrahedral iron atoms. This ideal structure is not usually realized in a real crystal, where stacking disorders in the cluster layers are successively introduced and in some cases the cluster itself is heavily deformed.Keywords
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