Journal ArticleDOI
The Invar problem
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TLDR
In this paper, the authors present results of recent total energy calculations as a function of the magnetic moment and atomic volume E (M, V ) and analyze Invar-relevant physical properties for a broad variety of fcc ferromagnetic and antiferromagnetic 3D-alloy systems as well as the electron concentration, and give an answer to the question why close to the Invar range martensitic fcc-bcc transitions occur.About:
This article is published in Journal of Magnetism and Magnetic Materials.The article was published on 1991-11-01. It has received 151 citations till now. The article focuses on the topics: Invar.read more
Citations
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Negative thermal expansion in functional materials: controllable thermal expansion by chemical modifications
TL;DR: NTE is reviewed in functional materials of ferroelectrics, magnetics, multiferroics, superconductors, temperature-induced electron configuration change and so on, in which NTE is determined by either ferroelectric order or magnetic one.
Journal ArticleDOI
Negative thermal expansion
TL;DR: In this article, the underlying thermodynamics, emphasizing the roles of thermal stress and elasticity, are reviewed, and vibrational and non-vibrational mechanisms operating on the atomic scale that are responsible for negative expansion in a wide range of materials.
Journal ArticleDOI
Permanent magnets and hard magnetic materials
TL;DR: In this paper, the definition and development of hard magnetic materials with special emphasis on more recent developments in this field is discussed. But the important hard ferrites are only briefly treated and only a few examples of modern permanent magnets, based on RE - cobalt alloys, on RE- Fe - B alloys and RE - Fe - nitrides, etc.
Journal ArticleDOI
First-principles investigations of atomic disorder effects on magnetic and structural instabilities in transition-metal alloys.
TL;DR: The coherent-potential approximation within the Korringa-Kohn-Rostocker band-structure scheme is used to investigate the influence of atomic disorder on magnetism and crystal structure of transition-metal alloys like iron-nickel and finds that magnetism in the ground state gradually vanishes.
Journal ArticleDOI
Tailored thermal expansion alloys
James A. Monroe,Dominic Gehring,Ibrahim Karaman,Raymundo Arroyave,Donald W. Brown,Bjørn Clausen +5 more
TL;DR: In this article, the authors report a new principle that enables the precise control of macroscopic thermal expansion response of bulk materials via crystallographic texture manipulation and by taking advantage of anisotropic Coefficients of Thermal Expansion (CTE) in a large class of martensitically transforming materials.
References
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Journal ArticleDOI
The Origin of the `Invar' Effect
TL;DR: In this paper, the idea that there are two electronic configurations of iron atoms in a face-centred cubic lattice is extended to the iron-nickel alloy system, and it is shown that the anomalous effect originates from the thermal excitation of the configuration with lower atomic volume in opposition to the normal anharmonic origin of expansion.
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The magnetization of face-centred cubic and body-centred cubic iron + nickel alloys
J. Crangle,G. C. Hallam +1 more
TL;DR: Magnetizations of single phase binary iron + nickel alloys have been measured and Bohr magneton numbers p estimated for body-centred cubic alloys with 0 to 32.3 at.
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Magnetovolume instabilities and ferromagnetism versus antiferromagnetism in bulk fcc iron and manganese
TL;DR: In this paper, a fixed spin-moment procedure was used to study magnetovolume effects in bulk fcc iron and maganese, where the moments were constrained to have fixed values in a unit cell of two atoms to allow for antiferromagnetic and field-induced ferrimagnetic order.
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Concentration Fluctuations and Anomalous Properties of the Invar Alloy
Sukeji Kachi,Hajime Asano +1 more
TL;DR: In this article, it was pointed out that concentration fluctuations affect the magnetic properties of Fe-Ni Invar alloys, which behaves as collection of cells containing equally 60 atoms whose mean concentrations are different from cell to cell.
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Metamagnetic behavior of fcc iron
TL;DR: In this article, the Stoner model of itinerant ferromagnetism in combination with self-consistent linear muffin-tin orbital non-spin-polarized calculations are used for analysis of metamagnetic behavior of fcc iron.