MAGNETIC PROPERTIES OF U1-xDyxAlyNi5-y (y=0,1) SYSTEMS

2003 ◽  
Vol 17 (27n28) ◽  
pp. 1453-1460
Author(s):  
ILEANA LUPSA
Keyword(s):  
Magnetic Properties ◽  
Low Temperature ◽  
Spin Fluctuation ◽  
Magnetic Moments ◽  
Transition Temperatures ◽  
Temperature Range ◽  
Fluctuation Model ◽  
Magnetically Ordered

The magnetic properties of U 1-x Dy x Al y Ni 5-y (y=0,1) systems were investigated in the 2(5)–600 K temperature range and for fields up to 80 kOe. The systems having x≥0.2 are magnetically ordered with low transition temperatures and magnetization mainly due to the Dy contribution. The nickel exhibits magnetic moments, very weak in the low temperature range and well-defined effective moments over transition temperatures. The nickel behavior is discussed in terms of the spin fluctuation model.

THE COMBINED ANALYSIS OF SPECIFIC HEAT AND THERMAL EXPANSION OF Nd1−xLuxMn2 COMPOUNDS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 810-813
Author(s):  
N.H. KIM-NGAN ◽  
P.E. BROMMER ◽  
J.J.M. FRANSE
Keyword(s):  
Magnetic Properties ◽  
Thermal Expansion ◽  
Thermodynamic Properties ◽  
Specific Heat ◽  
Crystal Field ◽  
Spin Fluctuation ◽  
Spin Reorientation ◽  
Antiferromagnetic Order ◽  
Combined Analysis ◽  
Temperature Range

Specific heat and thermal expansion measurements have been performed on Nd1−xLUxMn2 in the temperature range between 1.5K and 300K. Below 10K, anomalies are observed which are ascribed to a spin reorientation of the Nd sublattice. These anomalies are only slightly affected by the substitution of Nd by Lu. Large effects, however, are observed on the magnetic properties of the Mn sublattice. The antiferromagnetic order disappears for x exceeding 0.30. The data are analysed in terms of Grüneisen parameters. In the paramagnetic compound LuMn2, a spin-fluctuation contribution to the thermodynamic properties is observed. In the Nd-containing compounds, distinct contributions from the crystal field acting on the Nd ions can be distinguished. The variation of the magnetic properties of the Mn sublattice with the concentration of Lu is discussed.

MAGNETIC PROPERTIES OF THE Dy1-xUxCo3 SYSTEM

2010 ◽  
Vol 24 (32) ◽  
pp. 3041-3047
Author(s):  
ILEANA LUPŞA ◽  
T. PETRIŞOR ◽  
I. BALASZ-MUREŞAN
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Crystalline Structure ◽  
Exchange Field ◽  
Transition Temperatures ◽  
Temperature Range ◽  
The Mean

The magnetic properties of Dy 1-x U x Co 3 system were investigated in the 4.3–1150 K temperature range and magnetic field up to 120 kOe. The crystalline structure is rhombohedral of PuNi 3 type. For x≤0.8, the samples exhibit a ferrimagnetic behavior. The uranium substitution for dysprosium leads to the decreasing of the exchange field and the reducing of the magnetization and the transition temperatures. The Co mean moments (1.9μB/ Co for x=0) opposite to the dysprosium ones and the mean effective Co moments (3.75μB/ Co for x=0) are gradually decreasing as Dy is replaced by uranium.

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.

scholarly journals Магнитные свойства и природа магнитного состояния интеркалированных соединений Cr-=SUB=-x-=/SUB=-MoSe-=SUB=-2-=/SUB=-

2019 ◽  
Vol 61 (3) ◽  
pp. 472
Author(s):  
В.Г. Плещев ◽  
Н.В. Селезнева
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Low Temperature ◽  
Magnetic Moments ◽  
Ferromagnetic State ◽  
Paramagnetic Region ◽  
Temperature Dependences ◽  
Ferromagnetic Interactions ◽  
Curie Temperatures ◽  
Hysteresis Phenomena

AbstractThis is a pioneering work on the synthesis of molybdenum diselenides intercalated by chromium atoms. Their magnetic properties are studied at various intercalant concentrations, temperatures, and magnetic fields. The temperature dependences of effective magnetic moments and positive paramagnetic Curie temperatures in the paramagnetic region evidence the feasible ferromagnetic interactions between intercalated atoms. The existence of low-temperature ferromagnetic state in Cr_ x МоSe_2 is confirmed by hysteresis phenomena in temperature and field dependences of magnetization and magnetic susceptibility.

Magnetic properties of rare earth chromium borates at high temperatures

2021 ◽  
pp. 166-170
Author(s):  
O.K. Kuvandikov ◽  
◽  
N.I. Leonyuk ◽  
V.V. Malsev ◽  
M.M. Kuzmin ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Rare Earth ◽  
Temperature Dependence ◽  
High Temperatures ◽  
Wide Temperature Range ◽  
Magnetic Moments ◽  
Chemical Formula ◽  
Temperature Range ◽  
Curie Temperatures

Temperature dependence of the magnetic susceptibility has been studied for rare-earth borates NdCr3(BO3)4, SmCr3(BO3)4 and LuCr3(BO3)4 by the Faradey method in the wide temperature range (300-1200 K). The dependence for each phase follows the Curi - Weis law. The Curie temperatures, Neel temperatures and magnetic moments corresponding to the chemical formula of the crystals, have been found.

scholarly journals Enhanced Magnetization of Sol-Gel Synthesized Pb-Doped Strontium Hexaferrites Nanocrystallites at Low Temperature

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Shahid M. Ramay ◽  
Shahid Atiq ◽  
Murtaza Saleem ◽  
Asif Mahmood ◽  
Saadat A. Siddiqi ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Low Temperature ◽  
Saturation Magnetization ◽  
Structural Parameters ◽  
Hexagonal Phase ◽  
Magnetic Moments ◽  
Sol Gel ◽  
Magnetic Characteristics ◽  
Energy Product ◽  
Pb Substitution

Effect of Pb doping on the structural and low temperature magnetic properties ofSrPbxFe12-xO19(x=0,0.1,0.2,0.3,and  0.4), synthesized by sol-gel autocombustion technique, has been investigated. The powder samples were sintered at 800°C for 2 h in order to develop the stable hexagonal phase, characteristic of the SrFe12O19structure. The consequences of Pb substitution (at iron sites) on various structural parameters like lattice constants, unit cell volume, crystallite size, and porosity have been discussed. Fourier transform infrared frequency bands were utilized to determine the formation of tetrahedral and octahedral clusters of M-type ferrites. Hexagonal texture of the grains, a characteristic of the hexagonal crystal structure of SrFe12O19, was refined by Pb substitution. The magnetic properties, determined using a vibrating sample magnetometer, revealed that saturation magnetization decreased, while coercivity was increased with the increase of Pb contents. However, the increased squareness ratio and hence the energy product motivate the utilization of these ferrite compositions where hard magnetic characteristics are required. The increased values of saturation magnetization were observed at reduced temperature of 200 K, attributable to the better spin alignments of individual magnetic moments at low temperature.

MAGNETIC PROPERTIES OF (GdxZr1-x)2CoAl3 SYSTEM

2009 ◽  
Vol 23 (10) ◽  
pp. 1345-1350
Author(s):  
ILEANA LUPŞA ◽  
T. PETRIŞOR
Keyword(s):  
Magnetic Properties ◽  
Characteristic Temperature ◽  
Magnetic Moments ◽  
Spin Fluctuations ◽  
Temperature Range ◽  
Paramagnetic Behavior ◽  
Ordered State ◽  
Paramagnetic Properties

The magnetic properties of the ( Gd x Zr 1-x)2 CoAl 3 system were investigated in the 4–700 K temperature range and fields up to 70 kOe. The systems seem to be ferrimagnetically ordered. In the ordered state, the Co moments opposite to the gadolinium ones have very low values. The paramagnetic properties evidence over a characteristic temperature T*, a Curie–Weiss type behavior and the presence of the effective magnetic moments on Co atoms. The paramagnetic behavior of cobalt is analyzed in the spin fluctuations model.

Magnetic Properties of Cobalt and Manganese Oxide Spinel Ceramics

2010 ◽  
Vol 67 ◽  
pp. 143-148 ◽  
Author(s):  
Sophie Guillemet-Fritsch ◽  
Christophe Tenailleau ◽  
Helene Bordeneuve ◽  
Abel Rousset
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Low Temperature ◽  
Neutron Diffraction ◽  
Manganese Oxide ◽  
Magnetic Moments ◽  
Curie Constant ◽  
Octahedral Sites ◽  
Sample Composition ◽  
Oxide Spinel

Magnetic susceptibility measurements, magnetization and neutron diffraction results at low temperature for cobalt and manganese oxide spinel ceramics are presented. The Curie temperature varies similarly with the sample composition in ceramics and powders. The experimental molar Curie constant variation is explained by the presence of Co2+, CoIII, Mn3+ and Mn4+, and possibly Co3+ in the octahedral sites for the cobalt rich phases. The magnetic moments of the cations in tetrahedral and octahedral sites are not collinear and the global magnetization is oriented in a third direction.

The magnetic properties of the Tris(2-methyl-1,10-phenanthroline)iron(II) ion

1968 ◽  
Vol 21 (1) ◽  
pp. 83 ◽  
Author(s):  
HA Goodwin ◽  
RN Sylva
Keyword(s):  
Magnetic Properties ◽  
Thermal Equilibrium ◽  
Magnetic Moments ◽  
Anomalous Behaviour ◽  
Ligand Field ◽  
Temperature Dependent ◽  
Methyl Group ◽  
Temperature Range ◽  
Effective Strength

The magnetism of the salts [Fe mephen3]X2 (X = I-, ClO4-, BF4-, PF6-; mephen = 2-methyl- 1,l0-phenanthroline) has been investigated over the temperature range c. 100-300�K. The compounds exhibit anomalous behaviour, and this has been qualitatively interpreted as being the result of the presence of nearly equi-energetic ground terms 1A1 and 5T2 of the complexed iron(11) ion, a thermal equilibrium between these terms causing the magnetic moments to be markedly temperature dependent. This behaviour is apparently the result of the sterie hindrance to the coordination of an iron(11) ion induced by the presence of the methyl group in the ligand and the consequent lowering of the effective strength of the ligand field. The colour of the salts varies with temperature, and this has been discussed in terms of π-bonding between the iron(11) ion and the ligand.

scholarly journals Magnetic properties of Tm2Fe16 under pressure

2018 ◽  
Vol 185 ◽  
pp. 04018
Author(s):  
Anatoly Kuchin ◽  
Zdenek Arnold ◽  
Jiri Kamarád ◽  
Sergey Platonov
Keyword(s):  
Magnetic Properties ◽  
High Temperature ◽  
Low Temperature ◽  
Magnetic Moments ◽  
External Pressure ◽  
Complete Suppression ◽  
Moderate Pressure ◽  
Volume Changes ◽  
Uniaxial Magnetic Anisotropy ◽  
Magnetic States

The magnetic properties of the non-stoichiometric Tm2Fe16 compound under hydrostatic pressures up to 1 GPa were studied. We have revealed that the high-temperature ferrimagnetic state easily magnetized in the basal plane is very sensitive to the volume changes and even moderate pressure is sufficient to its complete suppression and transformation to a helimagnetic state. At the same time, the low-temperature ferrimagnetic state easily magnetized along the hexagonal axis does not disappear under pressure and the temperature of its transition to the high-temperature magnetic states increases under pressure. The remarkable stability of the ground ferrimagnetic state under external pressure can be attributed to the strengthening of the uniaxial magnetic anisotropy and to the mutual perpendicular orientation of the magnetic moments in the ground and the high-temperature magnetic states.

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