Journal ArticleDOI
Mössbauer measurements of magnetite below the Verwey transition
R.S. Hargrove,Walter Kündig +1 more
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TLDR
In this article, the Verwey transition is removed by measuring untwinned single crystals in a magnetic field, and the single crystal spectrum is then resolved into five individual components corresponding to a tetrahedral Fe +3, two octahedral Fe+3 and two octagonal Fe +2 sites.About:
This article is published in Solid State Communications.The article was published on 1970-03-01. It has received 145 citations till now. The article focuses on the topics: Electric field gradient & Hyperfine structure.read more
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Static and dynamic magnetic properties of spherical magnetite nanoparticles
TL;DR: In this paper, a detailed study of static and dynamic magnetic behavior of Fe3O4 nanoparticles with average particle sizes ranging from 5 to 150 nm is presented, and the existence of surface spin disorder can be inferred from the decrease of saturation magnetization MS at low temperatures, as the average particle size is reduced.
Journal ArticleDOI
The Verwey transition - a topical review
TL;DR: The story of the Verwey transition in magnetite over a period of about 90 years, from its discovery up to the present, can be subdivided into three eras as mentioned in this paper.
Journal Article
Crystal structure and cation distribution in titanomagnetites (Fe (sub 3-x) Ti x O 4 )
TL;DR: In this article, a systematic study of the crystal structure of titanomagnetites was undertaken to characterize the effects of composition and quenching temperature on the cation distribution.
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Ferrihydrite: surface structure and its effects on phase transformation
TL;DR: In this article, X-ray absorption fine structure (XAFS) spectra were collected on a series of ferrihydrite samples prepared over a range of precipitation and drying conditions.
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Mössbauer characterization of iron oxides and (oxy)hydroxides: the present state of the art
TL;DR: In this article, it was shown that the hyperfine parameters depend on much more structural features than the Al content and crystallinity alone, and that neither the Morin transition in hematite nor the Verwey transition in magnetite is directly applicable for analytical purposes.
References
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Journal ArticleDOI
Electronic Conduction of Magnetite (Fe 3 O 4 ) and its Transition Point at Low Temperatures
TL;DR: In this paper, the authors measured the electronic conductivity of a number of iron oxides of the homogeneous "Fe3O4" phase, especially as a function of the exact stoichiometrie composition of the material.
Journal ArticleDOI
Physical Properties and Cation Arrangement of Oxides with Spinel Structures II. Electronic Conductivity
TL;DR: In this paper, the relationship between the electronic conductivity of certain spinels and the arrangement of the cations in the crystal structure was studied, and it was shown that the activation energy of the spinels is lowest for those cases in which the electrons can travel along the Fe of the 16-fold position.
Journal ArticleDOI
Conductivity in iron oxides
TL;DR: In this article, the conductivity and thermal e.m.f. of wustite and magnetite have been measured as a function of the ratio O/Fe at T ⩾ 1000° C.
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Neutron Scattering from Magnetite below 119°K
TL;DR: In this article, it was shown that the low-temperature structure of magnetite gives rise to weak extra neutron diffraction lines that can be indexed as (h, k, l±½) in cubic indices.
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Mössbauer Study of Electron Hopping in the Octahedral Sites of Fe3O4
TL;DR: A linewidth study of the Mossbauer spectra of 57Fe in A and B sites in Fe3O4 as a function of temperature has shown that relaxation effects due to electron hopping in the B sites are present.
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Electronic conductivity and transition point of magnetite (“Fe3O4”)
E.J.W. Verwey,P.W. Haayman +1 more