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Tuesday, November 24, 2020 | History

2 edition of Magnetic properties of the metastable tau phase in the manganese-aluminium system. found in the catalog.

Magnetic properties of the metastable tau phase in the manganese-aluminium system.

David Malcolm Harry McAughty

Magnetic properties of the metastable tau phase in the manganese-aluminium system.

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  • 11 Currently reading

Published in Bradford .
Written in English


Edition Notes

Ph.D.thesis. Typescript.

SeriesTheses
The Physical Object
Pagination324p.
Number of Pages324
ID Numbers
Open LibraryOL13729668M

Phase relations have been established in the ternary system Ce-Rh-Si for the isothermal section at deg. C based on X-ray powder diffraction and EPMA on about 80 alloys, which were prepared by arc melting under argon or by powder reaction sintering. From the 25 ternary compounds observed at deg. C 13 phases have been reported earlier. Sources for the unpaired electrons per atom, the 16 MGOe theoretical maximum energy product (BH_max), and the difficulties in obtaining decent samples can all be found in Structure and Magnetic Properties of the MnBi Low Temperature Phase. If the URL doesn't work, just .


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Magnetic properties of the metastable tau phase in the manganese-aluminium system. by David Malcolm Harry McAughty Download PDF EPUB FB2

This second book in the Ready Reference series applies the principles of the first book to selected electrical and magnetic properties of metals. The materials are sorted by a common materials hierarchy, and their property values are given in a consistent system of.

Magnetic properties of the metastable tau phase in the manganese - Aluminium system. Author: McAughtry, D. ISNI: Awarding Body: University of Bradford Current Institution: University of Bradford Date of Award: Availability of Full Text. Metastable phases are obtained in Co/Nb multilayers with a constant d Nb of nm prepared by vapor deposition in high vacuum, and a single Co 7 Nb 6 phase at interfaces is found when d Co decreases to nm.

This metastable phase may explain the nonmagnetic behavior of Co/Nb multilayers for small d Co, i.e. theCited by: 1. A metallographical investigation of manganess-aluminum system was made in the compositional range of 47% to 60% of manganese, with the results of a new hexagonal close-packed phase and a metastable tetragonal ferromagnetic phase derived therefrom.

The conditions necessary for formation, structure, stability and thermal and magnetic properties of the latter phase have been by:   1. Introduction. Metastable Fe–Pd alloys made by mechanical alloying (MA) have been reported to have a BCC structure up to composition of 30 at% Pd and an FCC structure higher than composition of 40 at% behavior can be understood from the fact that the heavy plastic deformation of powders during MA creates nano-sized grains, suggesting that the large amount of Cited by: 8.

In as-cast Pr 80 Fe 15 (B 1−x C x) 5, samples metastable A 1 (T c = °C) was the predominant magnetic phase in the whole composition range, with intrinsic properties that were not affected with increasing C content.

Up to x= this phase coexists with an additional minor magnetic phase having T c = °C which has been labelled by us to as A annealing at °C A 1. The ferromagnetic ι-phase (P4/mmm) in the Mn-Al system, has good intrinsic magnetic properties which make it highly attractive as a non-rare-earth magnets to.

The {tau} phase is metastable and is usually produced by a rapid quench of the high temperature {var_epsilon} phase followed by isothermal annealing at temperatures between and C.

Prolonged annealing results in decomposition of the {tau} phase to. The MnAl-base permanent magnets derive their attractive magnetic properties from the formation of the metastable T-phase (Llo) after cooling from the high temperature e-phase (hep) field often followed by various heat treatments.

An optimized temperature of K, at which the decomposition of metastable $\tau$-phase was minimized, was selected to prepare the ferromagnetic $\tau$- from the $\epsilon$-phase.

The spherical $\tau$-phase powders were pressed at room temperatureinto two dimensional plates that stack along the direction of compaction, forming high density ( Previous studies have shown that in the Mn-Al system a metastable phase (the tetragonal L1 0 phase or τ phase) with remarkable magnetic properties can be obtained, the most stable composition.

The magnetic properties of metastable lithium iron oxides obtained by solvothermal ion-exchange and mixed-alkaline hydrothermal reactions have been examined. Fe 2+-containing Li 1−x Fe 5+x O 8 with inverse spinel structure have been obtained from a mixture of LiCl andα-NaFeO 2 by solvothermal reaction.

The phase has spontaneous magnetization. The technical magnetic properties derive from the formation of a metastable L10 intermetallic phase (τ-MnAl) characterized by a high, uniaxial magnetocrystalline anisotropy with an “easy” c-axis.

Metals, an international, peer-reviewed Open Access journal. Dear Colleagues, There is a significant gap between the energy product, BH max, of both the traditional ferrite and AlNiCo permanent magnets of less than 10 MGOe and that of the rare earth magnets of greater than 30 is a gap that Mn-based magnets could potentially fill inexpensively.

We report on the magnetic, electrical, and magnetotransport properties of La Ca Mn 1−X Al X O 3 (X = 0,) thin films grown on LaAlO 3 () substrate. It is observed that the low temperature ferromagnetic phase of La Ca MnO 3 transforms into metastable magnetic state in 15 at.

% Al doped sample, which has been characterized using long-time relaxation. Magnetic and structural properties of the metastable Mn Al alloy have been studied by neutron and X-ray diffraction and by differential scanning calorimetry. A strong influence of the magnetic long range order on the crystalline unit cell was observed, particularly in the vicinity of °C.

In the vicinity of the Curie temperature the structural transition of the crystalline lattice. In some cases the main phase of the permanent magnet material is metastable itself at room temperature. In other cases one employs the metastable character of solid solutions or amorphous alloys to generate microstructures with superior hard magnetic properties.

The various possibilities will be discussed and illustrated by means of examples. Mössbauer spectroscopy and magnetic susceptibilty measurements show that the Fe-(29–40)Mn-5Al austenitic alloys undergo an antiferromagnetic transformation similar to that observed in the Fe-()Mn austenitic steels.

The Néel temperature,TN,increases as a function of the Mn content (from K to K) while aluminium additions(5%wt.) induce a sharp decrease of TN(−K) but a small.

In book: Magnetic Properties of Metals, d-Elements, Alloys and Compounds, Edition: Data in Science and Technology, Chapter: c, Publisher:. Cite this paper as: Sugihara M., Tsuboya I.

() Structural and Magnetic Properties of Copper-Substituted Manganese-Aluminum Alloys. In: Osborn J.A. (eds) Proceedings of the Seventh Conference on Magnetism and Magnetic Materials. Manganese oxide nanoparticles with narrow size distribution were prepared in large scale by arc sublimation of bulk gh MnO is antiferromagnetic, the as-prepared manganese oxide nanoparticles exhibit ferromagnetic behaviors with coercivity and exchange bias up toA/m andA/m at 5 K, respectively.

We attribute these anomalous magnetic properties to the. Toropov N.A., Barzakovskii V.P. () Stable and Metastable Phase Relations in the System Magnesium Oxide-Alumina-Silica. In: High-Temperature Chemistry of Silicates and Other Oxide Systems / Vysokotemperaturnaya Khimiya Silikatnykh I Drugikh Okisnykh Sistem / Bьicoкotemпepatуphaя Xиmия Cиликathьix И Дpугиx Oкиchьix | Cиctem.

The magnetic properties of the manganese-copper alloy system have been investigated by using a number of experimental techniques. Long range antiferromagnetic order occurs in alloys of high manganese concentration; the disappearance of ordering is associated with a face centered tetragonal → face centered cubic martensitic transformation.

By extrapolation of the experimental. magnetic properties of the ternary layered compounds KMnTe 2, RbMnTe 2 and CsMnTe 2, synthetized for the first time by Kim et al [17]. Sincethis work remains, to the best of our knowledge, the only published article devoted to these compounds. Authors in reference.

A variety of new oxide-based materials based on hexagonal phase of YInO3 have been recently described. In some of these materials, the In(III) ions are substituted by Mn(III), which finds itself in a trigonal-bipyramidal (TBP) coordination environment.

While YInO3 is colorless and YMnO3 is black, mixed systems YIn1–xMnxO3 ( A metallographical investigation of manganess-aluminum system was made in the compositional range of 47% to 60% of manganese, with the results of a new hexagonal close-packed phase and a metastable tetragonal ferromagnetic phase derived therefrom.

The conditions necessary for formation, structure, stability and thermal and magnetic properties. The first-order magnetic phase transitions of the order–order type induced by magnetic field in the layered antiferromagnetic alloys of the system Fe a − x Mn x As are analyzed in the model of itinerant magnetism with allowance for the possible coexistence of ferromagnetic and antiferromagnetic deformations of the electronic band structure.

In the abstraction to a model description of Fe a. K, suggesting a rich magnetic phase diagram. The neutron diffraction data show that below TN) 41 K, the Mn3+ magnetic moments become ordered in an antiferromagnetic arrangement, adopting a modulated sinusoidal magnetic structure characterized by the wave vector k) (kx,0,0) (kx) at 41 K) and defined by the magnetic mode (Cx,0,0).

When the. During the last decades the knowledge of the magnetic properties of the d transition elements and of their metallic alloys and compounds has increased widely.

The improvement of preparation techniques for well-defined substances, the development of sophisticated measuring methods and above all the. The relation between the magnetic separation behavior and magnetic properties of a low-grade manganese ore was analyzed before and after treatment by direct reduction with coal.

It was found that raw ore with an initial average grade of % Mn and consisting of diamagnetic and paramagnetic minerals can be concentrated by high-intensity magnetic separation to produce a. Phase relations for the system Ni-Zn-B have been established in the isothermal section at Degree-Sign C based on X-ray powder diffraction and electron microprobe analyses of about 60 samples, which have been prepared by hot pressing of pre-annealed powder compacts of arc-melted master alloys Ni{sub x}B{sub y} and Zn-filings.

In the present work, four cubic Laves‐phase compounds containing manganese were investigated. All four compounds TbMn 2, GdMn 2, DyMn 2, and HoMn 2 were found to have antiferromagnetic coupling. At low temperatures and appropriate magnetic fields, sharp peaks in the magnetization versus temperature curves were obtained.

In general, these peaks shifted to lower temperatures as the. During the last decades the knowledge of the magnetic properties of the d transition elements and of their metallic alloys and compounds has increased widely.

The improvement of preparation techniques for well-defined substances, the development of sophisticated measuring methods and above all the drive to obtain more insight in the origin of magnetic interactions in solids have resulted in.

ChemInform Abstract: Synthesis of Metastable Phases in the Magnesium Spinel—Alumina System. ChemInform39 (15) DOI: /chin Thomas R. Hinklin, Jose Azurdia, Min Kim, Julian C. Marchal, Sameer Kumar, Richard M. magnetic properties of Manganese state the information about its magnetic ordering and orientation.

This study mainly focused on the solid-state phase transformations of Mn-Al magnetic alloys. In the first part, general characterization of Mn-Al alloys was conducted. Several characteristics of the system were examined.

It was observed that composition had an important effect on the magnetic behavior of the system. Alloys with. Manganese is a chemical element with the symbol Mn and atomic number It is not found as a free element in nature [not verified in body]; it is often found in minerals in combination with ese is a transition metal with a multifaceted array of industrial alloy uses, particularly in stainless steels.

Historically, manganese is named for pyrolusite and other black minerals from the. Magnetic Properties of Metals: d-Elements, Alloys and Compounds (Data in Science and Technology) Softcover reprint of the original 1st ed.

Edition by H.P. Wijn (Editor) ISBN   Auxiliary ligand-induced structural diversities of octacyanometalate-based heterobimetallic coordination polymers towards diverse magnetic properties.

Dalton Transactions34 DOI: /C9DTK. Hu Zhou, Qi Chen, Hui Yu, Xiu-Fen Yan, Ai-Hua Yuan, Xiao-Ping Shen. High permeability metal alloys are based primarily on the nickel-iron system. Although Hopkinson investigated nickel-iron alloys as early asit was not until the studies by Elmen, starting in abouton properties in weak magnetic fields and effects of heat-treatments, that the importance of the Ni-Fe alloys was realized.

A structural and magnetic characterization of a trinuclear chiral Mn(II) formate three-dimensional framework exhibiting a triangular arrangement is presented. Compound Na3[Mn3(HCOO)9] was obtained by solvothermal synthesis and crystallizes in the chiral cubic space group P and is well described by a Δ conformation.

The structure displays triangular Mn3 building blocks, in which the .Phase relations in the Ce-Pd-B system at deg. C are governed by formation of extended homogeneity fields, tau{sub 2}-CePd{sub 8}B{sub 2-x} (tau{sub 3}-Ce{sub 3}Pd{sub x}B{sub 8-y} (Specific Heat: Value given for solid phase.

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