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Crystal structure analysis of Ca4YFe5O13 by combining 1 MeV high-resolution electron microscopy with convergent-beam electron diffraction (1981)

Bando, Y. ; Sekikawa, Y. ; Yamamura, H. ; [et al.]

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 37 (1981), S. 723-728

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ISSN: 1600-5724

Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Topics: Chemistry and Pharmacology , Geosciences , Physics

Notes: By combining 1 MeV high-voltage-high-resolution electron microscopy with convergent-beam electron diffraction (CBED), the crystal structure of a perovskite-related compound, Ca4YFe5O13, is determined. The crystal has orthorhombic symmetry with lattice parameters a = 5.46, b = 37.4 and c = 5.54 Å. The space group is determined to be centrosymmetric Pnma by selecting the point group from the CBED patterns. The structure images taken from two principle-axis directions, which are interpreted on the basis of the calculated images, reveal that the structure consists of a succession of the stacking of FeO6 octahedra (O layer) and FeO4 tetrahedra (T layer) and is represented by the stacking sequence of ...OTOOTOTOOTO... along the b axis repeated at intervals of 37.4 Å. It is shown that the Ca4YFe5O13 crystal structure can be described in terms of unit-cell-level twinning of Ca2Fe2O5.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1107/S0567739481001605

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