A Superstructure in Spinels
TLDR
In this article, the powder diagrams of LiFe5O8 correspond with a primitive cubic lattice with a lattice constant of 8.33 A. Hoffman and E. A. Kordes have shown that the powder diagram of LiAl5O 8 correspond with the cubic lattices of the space group P433 and the positions of the atoms are P413.Abstract:
IN 1935, E. Kordes1 recognized that LiAl5O8 has nearly a spinel structure, but he observed a large number of extra lines, which he could not explain. A. Hoffman2 prepared the corresponding compound LiFe5O8, which again was recognized as having nearly spinel structure. We found3 that the powder diagrams of LiFe5O8 correspond with a primitive cubic lattice with a lattice constant of 8.33 A. The space group was found to be very probably P433 (or P413) and the positions of the atoms (in the notation of the International Tables, 1935) are: with Δ3, Δ4, Δ5 and Δ6 approximately 0.007 and Δ1 and Δ2 still smaller.read more
Citations
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Journal ArticleDOI
Structure of Spinel
TL;DR: In this article, the crystal structure of compounds with the general formula AB 2 X 4, which crystallize with the same atomic structure as the mineral spinel, MgAl 2 O 4, is reviewed.
Journal ArticleDOI
Iron oxide surfaces
TL;DR: In this paper, a review of the current status of knowledge regarding the surfaces of the iron oxides, magnetite (Fe3O4), maghemite (γ-Fe2O3), haematite (α-Fe 2O3, and wustite (fe1−xO) is reviewed.
Journal ArticleDOI
Polymorphous Transformations of Nanometric Iron(III) Oxide: A Review
TL;DR: In this paper, a review of the properties of the four known crystalline Fe2O3 polymorphs (alpha, beta, gamma, and epsilon-Fe2O 3) is presented.
Journal ArticleDOI
A powder neutron diffraction investigation of vacancy ordering and covalence in γ-Fe2O3
TL;DR: In this article, profile refinement of powder neutron diffraction data has been used to examine the structure of γ-Fe 2 O 3 and to evaluate covalence effects for octahedral and tetrahedral Fe 3+ ions within the structure.
Journal ArticleDOI
Vacancy ordering and electronic structure of gamma-Fe2O3 (maghemite): a theoretical investigation
TL;DR: The results show that the configuration with space group P4(1)2( 1)2 is indeed much more stable than the others, and that this stability arises from a favourable electrostatic contribution, as this configuration exhibits the maximum possible homogeneity in the distribution of iron cations and vacancies.
References
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Journal ArticleDOI
Structural interpretation of the diaspore–corundum and boehmite–γ‐Al2O3 transitions
Journal ArticleDOI
The Structure of the electrolytical oxide Layer on Aluminium
TL;DR: In this article, the authors examined the crystal structure of the thin oxide layer that is formed by the electrolytic oxidation of an aluminium electrode and showed that the structure of this oxide varies according to the method of preparation of the oxide layer.
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The Electrostatic Contribution to the Lattice Energy of Some Ordered Spinels
TL;DR: In this paper, the electrostatic contribution to the lattice energy of some ordered spinels is calculated and it is made plausible that also in the case of certain spinels that do not show any long-range ordering, a considerable amount of shortrange order is to be expected.
Journal ArticleDOI
Zur Kristallchemie der Lithiumferrite
TL;DR: Das Verpuppungshormon der Sehmetterlinge wirkt bei Dipteren in der gleiehen Weise wie dis eigene Hormon; ein umgekehrter Vergleich ist ill Vorbereitung.
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