Influence of Al Substitution on Magnetocaloric Effect in La0.8-XAlXCe0.2Fe11.4Si1.6 Compounds

2011 ◽  
Vol 399-401 ◽  
pp. 992-996
Author(s):  
Yi Hu ◽  
Shan Dong Li ◽  
Mei Mei Liu ◽  
Jian Peng Wu ◽  
Xin Le Cai ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Turning Point ◽  
Magnetic Transition ◽  
Magnetic Hysteresis ◽  
Doping Content ◽  
Magnetic Entropy ◽  
Al Doping ◽  
Al Substitution ◽  
Knee Point ◽  
Transition Type

The influence of Al doping on the magnetic properties and magnetic entropy changes (ΔSM) of the La0.8-xAlxCe0.2Fe11.4Si1.6(x = 0-0.2) compounds have been investigated around their Curie temperature TC. The incorporation of Al atoms is unfavorable for the formation of the NaZn13-type phase, however, it increases the TCby ~40 K, effectively decreases the magnetic hysteresis loss, and broadens the ΔSM-T curve at expense of the (ΔSM)maxof the compounds. It is also revealed that Al doping content of x = 0.06 is an important composition knee point where the doped Al start to occupy the site of Rare-earth elements, leading to a turning point for the lattice constant, TC, and magnetic transition type.

SPIN-FRUSTRATED EFFECT AND THE MAGNETIC PROPERTIES IN YMn1-xAlxO3

2013 ◽  
Vol 27 (22) ◽  
pp. 1350163 ◽  
Author(s):  
A. M. ZHANG ◽  
W. H. ZHU ◽  
X. S. WU ◽  
Q. BIAN
Keyword(s):  
Magnetic Properties ◽  
Solid State ◽  
Spin Glass ◽  
Solid State Reaction ◽  
Doping Concentration ◽  
Doping Content ◽  
Al Doping ◽  
Spin Glass Behavior ◽  
Exchange Path ◽  
Glass Behavior

Polycrystalline samples YMn 1-x Al x O 3 with different Al doping concentration were synthesized by standard solid-state reaction. Effect of Al doping on the magnetic properties was studied. Magnetization measurements show that the magnetization increases, while the calculated frustration factor decreases with the doping content of Al 3+ ion increasing. And the spin-glass behavior becomes more and more obvious with increasing the Al doping content. These results were ascribed to the broken exchange path between Mn ions by Al doping.

Structural and Magnetic Hysteresis Properties of Co-Zr Substituted Hexagonal Barium Ferrites

2015 ◽  
Vol 7 (1) ◽  
pp. 1346-1351
Author(s):  
Ch.Gopal Reddy ◽  
Ch. Venkateshwarlu ◽  
P. Vijaya Bhasker Reddy
Keyword(s):  
Magnetic Properties ◽  
Single Phase ◽  
Magnetic Hysteresis ◽  
Grain Morphology ◽  
Hexagonal Structure ◽  
Ion Composition ◽  
X Ray Diffraction ◽  
Ceramic Method ◽  
Barium Ferrites ◽  
Xrd Patterns

Co-Zr substituted M-type hexagonal barium ferrites, with chemical formula BaCoxZrxFe12-2xO19 (where x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0), have been synthesized by double sintering ceramic method. The crystallographic properties, grain morphology and magnetic properties of these ferrites have been investigated by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Vibrating Sample Magnetometer (VSM). The XRD patterns confirm the single phase with hexagonal structure of prepared ferrites. The magnetic properties have been investigated as a function of Co and Zr ion composition at an applied field in the range of 20 KOe. These studies indicate that the saturation magnetization (Ms) in the samples increases initially up to the Co-Zr composition of x=0.6 and decreases thereafter. On the other hand, the coercivity (Hc) and Remanent magnetization (Mr) are found to decrease continuously with increasing Co-Zr content. This property is most useful in permanent magnetic recording. The observed results are explained on the basis of site occupation of Co and Zr ions in the samples.

Al substitution effects to the magnetic properties of the compounds in the Sm–Fe system

2003 ◽  
Vol 171 (1-2) ◽  
pp. 339-344 ◽  
Author(s):  
H. Samata ◽  
R. Kasai ◽  
T. Taniguchi ◽  
Y. Nagata
Keyword(s):  
Magnetic Properties ◽  
Substitution Effects ◽  
Al Substitution

Structure, magnetic properties and thermal expansion of Mn3PtNx (0 ≤ x  ≤ 1.0) compounds

2018 ◽  
Vol 32 (28) ◽  
pp. 1850314 ◽  
Author(s):  
Ruihua Chou ◽  
Ying Sun ◽  
Huiqing Lu ◽  
Guang-Hong Lu
Keyword(s):  
Magnetic Properties ◽  
Thermal Expansion ◽  
Nitrogen Content ◽  
Magnetic Transition ◽  
Spin Correlation ◽  
Solid State Reaction Method ◽  
Volume Effect ◽  
Space Group ◽  
Thermal Expansion Behavior ◽  
Expansion Behavior

In this work, Mn3PtN[Formula: see text] (x = 0, 0.25, 0.5, 0.75 and 1.0) compounds were prepared by solid state reaction method. The structure, magnetic properties and thermal expansion behaviors of Mn3PtN[Formula: see text] compounds with different nitrogen content were systematically investigated. Mn3PtN has typical antiperovskite cubic structure with space group Pm-3m (221). With decreasing nitrogen content, the crystal structure changes to hexagonal with space group P63/mmc when the value of x decreases to x = 0.25, and then back to cubic with Fm3m at x = 0. All of the obtained Mn3PtN[Formula: see text] compound exhibit the magnetic transition from antiferromagnetic (AFM) to paramagnetic (PM). Moreover, another transition from AFM1 to AFM2 at lower temperature was also observed in Mn3Pt. The experimental results indicate that the magnetic transition induced abnormal thermal expansion behavior in Mn3PtN[Formula: see text]. Especially, a typical giant thermal expansion behavior of about [Formula: see text]8‰ volume change arising from the magneto-volume effect at 411 K is observed in Mn3Pt compound. The obtained results imply that this kind of compounds is a strong lattice–spin correlation system.

Synthesis, Magnetic Properties, Magnetic Entropy and Arrot Plot of Antiferromagnetic Frustrated Er2Ti2O7 Compound

2011 ◽  
Vol 25 (4) ◽  
pp. 1035-1042 ◽  
Author(s):  
N. Ben Amor ◽  
M. Bejar ◽  
M. Hussein ◽  
E. Dhahri ◽  
M. A. Valente ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Entropy

scholarly journals Developing a reference material set for the magnetic properties of NdFeB alloy-based hard magnetic materials

2019 ◽  
Vol 15 (1) ◽  
pp. 21-27
Author(s):  
E. A. Volegova ◽  
T. I. Maslova ◽  
V. O. Vas’kovskiy ◽  
A. S. Volegov
Keyword(s):  
Magnetic Properties ◽  
Magnetic Materials ◽  
Permanent Magnets ◽  
Magnetic Loss ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Magnetic Hysteresis Loop ◽  
Magnetic Characteristics ◽  
Hard Magnetic Materials ◽  
Certified Values

Introduction The introduction indicates the need for the use of permanent magnets in various technology fields. The necessity of measuring the limit magnetic hysteresis loop for the correct calculation of magnetic system parameters is considered. The main sources of error when measuring boundary hysteresis loops are given. The practical impossibility of verifying blocks of magnetic measuring systems element-by-element is noted. This paper is devoted to the development of reference materials (RMs) for the magnetic properties of hard magnetic materials based on Nd2Fe14B, a highly anisotropic intermetallic compound.Materials and measuring methods Nd-Fe-B permanent magnets were selected as the material for developing the RMs. RM certified values were established using a CYCLE‑3 apparatus included in the GET 198‑2017 State Primary Measurement Standard for units of magnetic loss power, magnetic induction of constant magnetic field in a range from 0.1 to 2.5 T and magnetic flux in a range from 1·10–5 to 3·10–2 Wb.Results and its discussion Based on the experimentally obtained boundary hysteresis loops, the magnetic characteristics were evaluated, the interval of permitted certified values was set, the measurement result uncertainty of certified values was estimated, the RM validity period was established and the first RM batch was released.Conclusion On the basis of conducted studies, the RM type for magnetic properties of NdFeB alloy-based hard magnetic materials was approved (MS NdFeB set). The developed RM set was registered under the numbers GSO 11059–2018 / GSO 11062–2018 in the State RM Register of the Russian Federation.

scholarly journals Magnetic properties of the non-stoichiometric TbCo2Nix alloys

2018 ◽  
Vol 185 ◽  
pp. 04021
Author(s):  
Alexander Inishev ◽  
Evgeny Gerasimov ◽  
Nikolay Mushnikov ◽  
Pavel Terentev ◽  
Vasily Gaviko
Keyword(s):  
Magnetic Properties ◽  
Curie Temperature ◽  
Concentration Dependence ◽  
Magnetic Moment ◽  
Magnetic Entropy Change ◽  
Entropy Change ◽  
Magnetic Entropy ◽  
Thermodynamic Relation ◽  
Temperature Dependences

The magnetic and magnetothermal properties of the non-stoichiometric TbCo2Nix (0 ≤ x ≤ 0.2) alloys were studied. It was found that the concentration dependence of the Curie temperature and magnetic moment of the 3d-sublattice have a maximum at x = 0.025. The obtained experimental magnetic properties of the TbCo2Nix alloys were discussed under assumption that the Co magnetic moment in the compounds changes with increasing x. The magnetic entropy change was determined using the temperature dependences of the magnetization and Maxwell’s thermodynamic relation. The obtained results for TbCo2Nix were compared with those for the ErCo2Mnx alloys.

Structural and Magnetic Properties of Nano Composite (Ni1-xSrx Fe12 O19) Prepared by Sol-gel

2021 ◽  
Vol 19 (10) ◽  
pp. 20-28
Author(s):  
Dhifaf Hussain Hassan ◽  
Sabah Jalal Fathi
Keyword(s):  
Magnetic Properties ◽  
Hysteresis Loop ◽  
Quaternary Structure ◽  
Sol Gel ◽  
Magnetic Hysteresis ◽  
Magnetic Hysteresis Loop ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Two Phases ◽  
Hematite Fe2o3

The compound was prepared by sol-gel method for spontaneous combustion with certain weight ratios (x=0.0,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9), the samples were calcined at a temperature (900oC) for a period of two hours(2h), then studied its structural and magnetic properties.one of the most prominent results that we obtained from the X-ray diffraction technique (XRD) is that compound has several phases. Where the sample (NiFe2O4) appeared to be polycrystalline and the dominant phase in it is the cubic phase, while the other phase is (Hematite)(Fe2O3) A crystal structure rhomboid (Rhombohedral), in addition to these two phases, the phase with the existing quaternary structure appeared (Sr2Fe2O5) its called (Orthorhombic). The results of the magnetic properties that were obtained through the (VSM) device, and one of the most important of these properties is the magnetic hysteresis loop by analyzing the magnetic hysteresis loop at (x=0.3), where the least area of the hysteresis loop or the least width of the hysteresis loop One of the most important parameters of the magnetic properties is the saturation magnetism (μS) and its value ranges from (19.76-3.86) (emu/gr), the highest value was at (X=0.3) and its value is (19.76emu/gr) and in general its value decreases with increasing concentration of strontium. The residual magnetism (Mr) ranges between (7.45-1.58) (emu/gr), where it reached its highest value at (x=0.3) and its value is (7.45emu/gr), and generally its value decreases with increasing concentration of strontium. In addition to that, there is another parameter which is coercion or Magnetic coercivity (Hc) ranges in value (1751.104-209.26) (Oe), reaching its lowest value at (x=0.3), and then increases with increasing strontium concentration until it reaches its highest value at (x=0.9), where it reached its value is (1751.104Oe). The square rate represented by the symbol (μi) has high values. This means that there is a mutual coupling between the soft and hard magnetic phases, which was the highest value at (x=0.3) and its value is (4.93).

Study of Magnetic Transition and Magnetocaloric Effect in La1-xSrxMnO3 (0.20≤ x ≤0.35) Compounds

2013 ◽  
Vol 378 ◽  
pp. 225-229 ◽  
Author(s):  
Yeong Seung Jeong ◽  
M.S. Anwar ◽  
Faheem Ahmed ◽  
Seung Rok Lee ◽  
Bon Heun Koo
Keyword(s):  
Curie Temperature ◽  
Magnetic Entropy Change ◽  
Perovskite Phase ◽  
Magnetic Transition ◽  
Entropy Change ◽  
Solid State Reaction Method ◽  
Magnetic Entropy ◽  
Conventional Solid State Reaction ◽  
Ionic Radii ◽  
The Difference

We report the magnetic transition and large magnetic entropy change in Sr doped lanthanum manganites. Polycrystalline La1-xSrxMnO3(0.20x0.35) samples were prepared using the conventional solid-state reaction method. The results of X-ray diffraction indicates perovskite phase without any impurity. The magnetic study has revealed that the Curie temperature is influenced by Sr-concentration. The doping of Sr at La site affects the Mn-O bond length and Mn-O-Mn bond angle due to the difference in their ionic radii, consequently, the Curie temperature changed. A large magnetic entropy change has been observed for La0.8Sr0.2MnO3sample, the value of the maximum entropy change (SMmax) increases from 1.42 to 2.74 J/kgK as magnetic field increases from 1 to 2.5 T. This investigation suggests that La1-xSrxMnO3can be used as a potential magnetic refrigeration material.

Magnetocaloric Properties of Rapidly Solidified Ni51.1Mn31.2In17.7 Heusler Alloy Ribbons

2009 ◽  
Vol 1200 ◽  
Author(s):  
Jose Sánchez Llamazares ◽  
Blanca Hernando ◽  
Víctor Prida ◽  
Carlos García ◽  
Caroline Ross
Keyword(s):  
Melt Spinning ◽  
Magnetic Entropy Change ◽  
Magnetic Transition ◽  
Entropy Change ◽  
Single Step ◽  
Magnetic Entropy ◽  
Refrigerant Capacity ◽  
Magnetocaloric Properties ◽  
Room Temperature Magnetic Refrigeration ◽  
Rapidly Solidified

AbstractMagnetic entropy change and refrigerant capacity have been determined for a field change of 20 kOe around the second-order magnetic transition of austenite in as-quenched Ni51.1Mn31.2In17.7 alloy ribbons produced by melt spinning technique. Samples crystallize in a single-phase austenite with the highly ordered L21-type crystal structure and a Curie temperature of 275 K. The material shows a maximum magnetic entropy change of ΔSMmax= - 1.7 Jkg-1K-1, an useful working temperature range of 78 K (δTFWHM) and a refrigerant capacity of RC=132 Jkg-1 (RC= │ΔSMmax│ x δTFWHM). The considerable RC value obtained together with the fabrication via a single-step process make austenitic Ni-Mn-In ribbons of potential interest as magnetic refrigerants for room temperature magnetic refrigeration.

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