Journal ArticleDOI
Thermoelectric power of pure and substituted magnetite above and below the verwey transmission
Costel Constantin,M. Rosenberg +1 more
TLDR
In this article, the temperature dependence of the Seebeck coefficient θ of pure and partially Ni, Co and Mn substituted magnetic between 63 and 300°K was investigated, and the most striking feature was the rather sharp change in sign of θ at the Verwey transition in pure magnetite.About:
This article is published in Solid State Communications.The article was published on 1971-05-15. It has received 18 citations till now. The article focuses on the topics: Seebeck coefficient.read more
Citations
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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 ArticleDOI
Finite size effects on the electrical properties of sol–gel synthesized CoFe2O4 powders: deviation from Maxwell–Wagner theory and evidence of surface polarization effects
TL;DR: In this article, fine particles of cobalt ferrite were synthesized by the sol?gel method and X-ray diffraction studies were carried out to elucidate the structure of all the samples.
Journal ArticleDOI
Electronic Conduction and Thermopower of Magnetite and Iron‐Aluminate Spinels
Thomas O. Mason,H. K. Bowen +1 more
TL;DR: In this paper, a small-polaron model of electronic conduction was proposed for magnetite and iron-aluminate spinels at high temperatures, and electrical properties corroborated the previously established cation distribution and defect model.
Journal ArticleDOI
Electrical and magnetic properties of NiCrxFe2−xO4 spinel (0 ≤ x ≤ 0.6)
Seung Hwon Lee,Sang Jun Yoon,Gi-Ja Lee,Hong Seok Kim,Chul Hyun Yo,K. Ahn,Dong Hoon Lee,Keu Hong Kim +7 more
TL;DR: The spinel ferrite NiCrxFe2−xO4 system was synthesized under atmospheric pressure, and showed single spinel phase in the XRD pattern as discussed by the authors.
Journal ArticleDOI
Nonstoichiometry, cation distribution, and electrical properties in Fe3O4‒CoFe2O4 at high temperature
D. S. Erickson,Thomas O. Mason +1 more
TL;DR: In this paper, the conductivity of the Fe3O4 CoFe2O4 from 600 to 1300°C was calculated from high-temperature thermopower measurements on oxygen-stoichiometric specimens.
References
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Journal ArticleDOI
Metal-Insulator Transition
TL;DR: A general survey of the metal-nonmetal transition is given in this article with particular emphasis on the following points: (a) is the transition of first order; (b) can one observe the transition; and (c) how the transition affected when it occurs in ionic lattices or polar liquids.
Journal ArticleDOI
Electrons in disordered structures
TL;DR: In this article, the authors discuss the role of disordered structures in the evolution of the electron in disordered structure and propose a method to find disordered electron structures in a graph.
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Electronic conductivity and transition point of magnetite (“Fe3O4”)
E.J.W. Verwey,P.W. Haayman +1 more
TL;DR: In this article, an einigen gesinterten Stabchen aus Magnetit (Fe 3 O 4 ) wird festgestellt dass sich der elektrische Widerstand bei Uberschreitung eines Umwandlungpunktes in der Umgebung von 100-200°K sprunghaft andert.
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Physical Properties and Cation Arrangement of Oxides with Spinel Structures I. Cation Arrangement in Spinels
E. J. W. Verwey,E. L. Heilmann +1 more
TL;DR: In this paper, a detailed x-ray study of a large number of oxides having a spinel structure was carried out, and it was established whether they crystallize in the ''normal'' spinel-type structure, XY2O4, or in the ``inversed'' type of structure, Y(XY)O4.
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Mechanisms for Metal-Nonmental Transitions in Transition-Metal Oxides and Sulfides
TL;DR: The experimental situation in transition metal oxides and sulfides is briefly reviewed in this article, and it appears likely that band theory can be adapted to describe most of the materials that exhibit metal-nonmetal transitions.