MAGNETIC PROPERTIES OF GdxY1-xLaAl4 SYSTEM

2005 ◽  
Vol 19 (03) ◽  
pp. 113-117
Author(s):  
ILEANA LUPSA
Keyword(s):  
Magnetic Properties ◽  
Transition Temperature ◽  
Structural Study ◽  
Magnetic Moment ◽  
Random Distribution ◽  
Exchange Interactions ◽  
Atomic Disorder ◽  
Gadolinium Concentration ◽  
Ferromagnetic Order ◽  
Temperature Range

The magnetic and structural study of Gd x Y 1-x LaAl 4 system was performed. The magnetic properties investigated in the 4–600 K temperature range and fields up to 80 kOe showed the ferromagnetic order for x≤0.8. For low gadolinium concentration, x≤0.4, the magnetic moment and the transition temperature values are lower than expected for Gd 3+ ion. It is considered that the dilution allows the formation of substitutional and atomic disorder, leading to modifications in the exchange interactions and determining a random-distribution configuration for gadolinium moments.

THE MAGNETIC BEHAVIOR OF (Y1-xTbx)3Co11B4 INTERMETALLIC COMPOUNDS

1999 ◽  
Vol 13 (25) ◽  
pp. 905-910
Author(s):  
R. TETEAN ◽  
V. POP ◽  
E. BURZO ◽  
I. GR. DEAC
Keyword(s):  
Magnetic Properties ◽  
Intermetallic Compounds ◽  
Exchange Interactions ◽  
Magnetic Behavior ◽  
Hexagonal Structure ◽  
External Fields ◽  
Space Group ◽  
Temperature Range ◽  
Ferrimagnetic Ordering ◽  
Curie Temperatures

The R 3 Co 11 B 4 compounds belong to the R n+1 Co 3n+5 B 2n intermetallic systems. The R 3 Co 11 B 4 borides crystallize in a hexagonal structure of Ce 3 Co 11 B 4 type having the space group P6/mmm. The composition dependencies of the lattice parameters in ( Y 1-x Tb x)3 Co 11 B 4 compounds are linear and different for a and c parameters. The magnetic properties of ( Y 1-x Tb x)3 Co 11 B 4 compounds were investigated in the temperature range 4.2–950 K and external fields up to 10 T. The Y 3 Co 11 B 4 compound is ferromagnetically ordered. For the compounds with x>0, a ferrimagnetic ordering is evidenced. The Curie temperatures increase when yttrium is substituted by terbium, as a consequence of the increase of the exchange interactions in the system. The magnetic behavior of cobalt in the above system is analyzed.

scholarly journals MAGNETIC PROPERTIES OF SINGLE CRYSTALS (MnIn2S4)1–х–(AgIn5S8)х SOLID SOLUTIONS

Doklady BGUIR ◽  
2019 ◽  
pp. 95-99
Author(s):  
I. V. Bodnar ◽  
Bin Tkhan Chan
Keyword(s):  
Magnetic Properties ◽  
Magnetic Fields ◽  
Single Crystals ◽  
Solid Solutions ◽  
Magnetic Moment ◽  
Temperature Range ◽  
Bridgeman Method ◽  
The Given ◽  
Specific Magnetic Moment

Single crystals of solid solutions (MnIn2S4)1-х–(AgIn5S8)х have been grown with the Bridgeman method in the whole range of temperatures. The crystals structure and composition were determined. The study of the given single crystals in the temperature range 2–300 К and magnetic fields to 10 T was carried out. It is set that the given crystals are paramagnetic in the whole studied range. The specific magnetic moment increases with the temperature.  

A Study of Exchange Interactions in R(FeCo)11TiCy (R=Y or Pr) Compounds

2011 ◽  
Vol 170 ◽  
pp. 223-226
Author(s):  
Corneliu Bazil Cizmas ◽  
Lotfi Bessais
Keyword(s):  
Magnetic Properties ◽  
Exchange Interaction ◽  
Magnetic Moment ◽  
Exchange Coupling ◽  
Interaction Strength ◽  
Exchange Interactions ◽  
Field Approximation ◽  
Molecular Field ◽  
Coupling Parameters ◽  
Structural And Magnetic Properties

The exchange interactions in PrFe11-xCoxTiCy (x=0÷2, y≤1), are analyzed on the basis of the structural and magnetic properties of polycrystalline samples. The magnetic properties of polycrystalline isomorphous compounds YFe11-xCoxTiCy have been used in order to determine the T (T=Fe+Co) sub-lattice contributions, such as the T sub-lattice mean magnetic moment and the T-T exchange interaction strength. The exchange coupling parameters JTT, JRT and the recurrent molecular field coefficients nTT, nRT have been calculated in the molecular field approximation (MCA). The effects of Co content and carbonation on the R-T (T=Fe+Co) and on the T-T exchange interactions are analyzed.

Magnetic Properties Variations in Iron Complexes with Benzimidazole Derivatives Depending on the System Spin State

2012 ◽  
Vol 190 ◽  
pp. 633-636
Author(s):  
L.V. Khenkin ◽  
Alla A. Novakova ◽  
Nikolai S. Perov ◽  
A. A. Vompe
Keyword(s):  
Magnetic Properties ◽  
Transition Temperature ◽  
Magnetic Moment ◽  
Valence State ◽  
High Field ◽  
Alkyl Radical ◽  
Spin Transition ◽  
Chloride Ion ◽  
Benzimidazole Derivatives ◽  
Iron Ions

Complexes of bivalent and trivalent iron with ligands based on benzimidazole derivatives have been synthesized and investigated. Chloride-ion was used as anion. Samples ligands differed from each other in the length of alkyl radical. Some samples were found in a mix-valence state, that complicated spin transition observation. Combination of Mossbauer spectroscopy and magnetic moment in high field (15kOe) measurements in the temperatures range 130K - 350K allowed us to establish the valence of iron ions under spin transition in our samples and spin transition temperature frameworks for these mix-valence compounds.

MAGNETIC PROPERTIES OF U1-xYxMnAl SYSTEM

2004 ◽  
Vol 18 (30) ◽  
pp. 1543-1549
Author(s):  
ILEANA LUPSA
Keyword(s):  
Magnetic Properties ◽  
Magnetic Moment ◽  
Effective Magnetic Moment ◽  
Magnetic Measurements ◽  
Spin Fluctuation ◽  
Uranium Atom ◽  
Temperature Range

The magnetic measurements on U 1-x Y x MnAl system were performed in the 4–600 K temperature range and fields up to 70 kOe. YMnAl presents spin fluctuation characteristics due to manganese atoms with a Curie–Weiss type behavior over the T* temperature. The gradual substitution of uranium for yttrium leads to similar behavior evidencing higher molar Curie constants and supporting a contribution due to uranium atom. The effective magnetic moment on uranium positions is that of U 3+ ion (3.1μB) and is composition-independent. The spin fluctuating state of manganese is characterized by the effective magnetic moment of 3μB/ Mn atom. The intrinsic Mn moment order is discussed in the critical Mn – Mn separation term.

Magnetic Properties of the U1-xYxNiAl System

2003 ◽  
Vol 17 (22) ◽  
pp. 1181-1185 ◽  
Author(s):  
P. Lucaci ◽  
Ileana Lupsa
Keyword(s):  
Magnetic Properties ◽  
Magnetic Moment ◽  
Effective Magnetic Moment ◽  
Uranium Atom ◽  
Absolute Magnitude ◽  
Spin Fluctuations ◽  
Temperature Range ◽  
Yttrium Content ◽  
Curie Temperatures

The magnetic properties of the U 1-x Y x NiAl system were studied in the 4–600 K temperature range fields up to 7 T. The systems with x≤0.8 were analyzed in terms of the spin fluctuations theory. The system presents a Curie–Weiss type behavior over a certain temperature T*. The paramagnetic Curie temperatures are negative and decrease in absolute magnitude as yttrium content increases. The effective magnetic moment per uranium atom is composition independent (≈3.1 μB) proving the presence of temperature induced spin fluctuations.

scholarly journals Низкотемпературные магнитные свойства аморфного ферромагнитного микропровода из сплава Fe-Si-B в стеклянной оболочке и без нее

2018 ◽  
Vol 60 (6) ◽  
pp. 1147
Author(s):  
И.А. Барабан ◽  
А.В. Емельянов ◽  
П.Н. Медведская ◽  
В.В. Родионова
Keyword(s):  
Magnetic Properties ◽  
Low Temperature ◽  
Magnetic Fields ◽  
Temperature Dependence ◽  
Magnetic Moment ◽  
Room Temperature ◽  
High Magnetic Fields ◽  
Glass Coating ◽  
Temperature Range ◽  
Taylor Method

AbstractThis work presents results of investigations of low temperature magnetic properties of microwires, fabricated by the Ulitovsky–Taylor method from Fe–Si–B alloy. Influence of the glass coating presence on the magnetostatic properties was shown at room temperature and at 2 K. Conclusions about the peculiarities of temperature dependence of the magnetic moment, measured in low and high magnetic fields (10 Oe–5 kOe) in the temperature range from 2 to 300 K for a sample with partially reduced fabricated processinduced stress by removing the glass, were made.

Features of radiothermoluminescence of polypropylene and ethylene propylenediene elastomer SKEPT-4044 compositions with nanoscale metal-containing fillers

2020 ◽  
pp. 66-73
Author(s):  
A.M. Magerramov ◽  
◽  
N.I. Kurbanova ◽  
M.N. Bayramov ◽  
N.A. Alimirzoyeva ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Molecular Mobility ◽  
Fe3o4 Nanoparticles ◽  
Low Temperatures ◽  
Frost Resistance ◽  
Relaxation Processes ◽  
Ethylene Propylene ◽  
Temperature Range ◽  
Β Relaxation

Using radiothermoluminescence (RTL), the molecular mobility features in the temperature range of 77-300 K were studied for the polypropylene (PP)/ethylene propylene diene elastomer SKEPT-4044 with NiO, Cu2O and Fe3O4 nanoparticles (NPs) based on ABS-acrylonitrile butadiene or SCS-divinyl styrene matrices. It has been shown that the introduction of nanofillers in PP significantly affects the nature and temperature of γ- and β-relaxation processes, while the region of manifestation of the β-process noticeably shifts to the region of low temperatures. Composites with Cu2O NPs have a higher β-transition temperature Tβ than composites with other NPs. It was found that PP/SKEPT-4044 composites with Cu2O NPs with a dispersion of 11-15 nm and acrylonitrile butadiene thermoplastics have optimal frost resistance compared to other compositions.

Magnetic anomalies, chemical and magnetic properties at wide temperature range (15–1000 K) in LiSrxFe5-xO8 (x = 0, 0.025, 0.05)

2021 ◽  
Vol 859 ◽  
pp. 158290
Author(s):  
S. Udhayakumar ◽  
G. Jagadish Kumar ◽  
E. Senthil Kumar ◽  
M. Navaneethan ◽  
K. Kamala Bharathi
Keyword(s):  
Magnetic Properties ◽  
Wide Temperature Range ◽  
Magnetic Anomalies ◽  
Temperature Range

scholarly journals Enhancing Superconductivity of the Nonmagnetic Quasiskutterudites by Atomic Disorder

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5830
Author(s):  
Andrzej Ślebarski ◽  
Maciej M. Maśka
Keyword(s):  
High Temperature ◽  
Transition Temperature ◽  
Superconducting Transition Temperature ◽  
High Temperature Superconductors ◽  
Superconducting Phase ◽  
Length Scale ◽  
Superconducting Transition ◽  
Atomic Disorder ◽  
Strong Inhomogeneity ◽  
Related Compounds

We investigated the effect of enhancement of superconducting transition temperature Tc by nonmagnetic atom disorder in the series of filled skutterudite-related compounds (La3M4Sn13, Ca3Rh4Sn13, Y5Rh6Sn18, Lu5Rh6Sn18; M= Co, Ru, Rh), where the atomic disorder is generated by various defects or doping. We have shown that the disorder on the coherence length scale ξ in these nonmagnetic quasiskutterudite superconductors additionally generates a non-homogeneous, high-temperature superconducting phase with Tc⋆>Tc (dilute disorder scenario), while the strong fluctuations of stoichiometry due to increasing doping can rapidly increase the superconducting transition temperature of the sample even to the value of Tc⋆∼2Tc (dense disorder leading to strong inhomogeneity). This phenomenon seems to be characteristic of high-temperature superconductors and superconducting heavy fermions, and recently have received renewed attention. We experimentally documented the stronger lattice stiffening of the inhomogeneous superconducting phase Tc⋆ in respect to the bulk Tc one and proposed a model that explains the Tc⋆>Tc behavior in the series of nonmagnetic skutterudite-related compounds.

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