Study of the magnetic properties and magnetocaloric effects in (Ho0.85RE0.15)3Pd2 (RE=Y and Gd) compounds

2020 ◽  
Vol 34 (11) ◽  
pp. 2050112
Author(s):  
X. F. Wu ◽  
C. Guo ◽  
Y. S. Du ◽  
J. Wang ◽  
L. Ma ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Single Phase ◽  
Magnetic Moments ◽  
Type Structure ◽  
Field Change ◽  
Text Type ◽  
Magnetocaloric Properties ◽  
Second Order Transition ◽  
Curie Temperatures

The crystal structure, magnetic and magnetocaloric properties of the [Formula: see text] (RE=Y and Gd) compounds were investigated. Both of the compounds crystallize in a single phase with a tetragonal [Formula: see text]-type structure (space group [Formula: see text]/mbm) and undergo a second-order transition from ferromagnetic (FM) state to paramagnetic (PM) state. In the PM region, the reciprocal susceptibilities both obey the Curie–Weiss law. The paramagnetic Curie temperatures [Formula: see text] for [Formula: see text] and [Formula: see text] were determined to be 4.9 K and 3.2 K, and the corresponding effective magnetic moments [Formula: see text] are 10.3 [Formula: see text]/RE and 10.5 [Formula: see text]/RE, respectively. Under a field change from 0 T to 5 T, the maximum values of [Formula: see text] for the [Formula: see text] and [Formula: see text] compounds are determined to be [Formula: see text] and [Formula: see text], with the corresponding RC values of [Formula: see text] and [Formula: see text], respectively.

Microstructure and Magnetic Properties of RE2.28Fe13.58B1.14 Alloys

2016 ◽  
Vol 848 ◽  
pp. 709-714 ◽  
Author(s):  
Gang Fu ◽  
Jiang Wang ◽  
Mao Hua Rong ◽  
Guang Hui Rao ◽  
Huai Ying Zhou
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Rare Earth ◽  
Single Phase ◽  
Permanent Magnets ◽  
Industrial Applications ◽  
Arc Melting ◽  
Light Rare Earth Elements ◽  
Curie Temperatures ◽  
Microstructure And Magnetic Properties

The rare-earth (RE) permanent magnets based on Nd2Fe14B with excellent magnetic properties have been widely used in industrial applications. In this work, the crystal structure, microstructure and magnetic properties of Nd2.28Fe13.58B1.14, Ce2.28Fe13.58B1.14 and Pr2.28Fe13.58B1.14 alloys prepared by arc-melting were investigated. The results show that all alloys are single phase with tetragonal Nd2Fe14B-type (space group P42/mnm). The Curie temperatures (Tc) of RE2.28Fe13.58B1.14 (RE=Nd, Ce, Pr) alloys are 583 K, 423 K and 557 K, respectively. On the other hand, the coercivities of Nd2.28Fe13.58B1.14 and Pr2.28Fe13.58B1.14 alloys are about 1.05 T and 1.23 T, respectively, while that of Ce2.28Fe13.58B1.14 alloy is only about 0.25 T due to the poor squareness of hysteresis loop. Meanwhile, the saturation magnetizations of Nd2.28Fe13.58B1.14 and Pr2.28Fe13.58B1.14 alloys are about 135 emu/g and 113 emu/g, respectively, while that of Ce2.28Fe13.58B1.14 alloy is about 97 emu/g. It was indicated that the Curie temperatures and magnetic properties of RE2.28Fe13.58B1.14 alloys with the same crystal structure are dependent on light rare earth elements.

Influence of Ge-doping on the structural and magnetic properties of Nd 6Fe13Pd1−xGex compounds

2019 ◽  
Vol 33 (08) ◽  
pp. 1950086
Author(s):  
J. F. Yuan ◽  
X. F. Wu ◽  
Y. S. Du ◽  
G. Cheng ◽  
L. Ma ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Single Phase ◽  
Magnetic Transition ◽  
Physical Property Measurement System ◽  
Physical Property ◽  
X Ray ◽  
Text Type ◽  
Magnetocaloric Properties ◽  
Property Measurement ◽  
Ge Doping

In this paper, we report the structural, magnetic, and magnetocaloric properties of Ge-doped [Formula: see text] (x = 0.1, 0.2) compounds. Rietveld refinement of X-ray powder diffraction shows that all the investigated samples are single phase and crystallize in a tetragonal [Formula: see text]-type structure with the space group [Formula: see text]/mcm. The magnetic properties of the intermetallic [Formula: see text] compounds have been investigated by the physical property measurement system (PPMS). The magnetic transition temperatures [Formula: see text] from the ferromagnetic (FM) to the antiferromagnetic (AFM) states are determined to be 123 and 111 K for x = 0.1, 0.2, respectively, which shifted to lower temperatures compared with the [Formula: see text] compound. For a field change of 5 T, the peak values of [Formula: see text] for the [Formula: see text] and [Formula: see text] compounds are estimated to be 3.73 and [Formula: see text] with the corresponding refrigeration capability (RC) values of 271.7 and [Formula: see text], respectively.

scholarly journals Effect of Nd, Pr substitutional atoms on the magnetic and magnetostrictive properties in (Tb-Dy)(Fe-Co)2 Laves phases

2021 ◽  
Vol 2103 (1) ◽  
pp. 012196
Author(s):  
G A Politova ◽  
M A Ganin ◽  
A B Mikhailova ◽  
D A Morozov ◽  
K E Pankov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Laves Phase ◽  
Type Structure ◽  
Partial Substitution ◽  
Laves Phases ◽  
Temperature Range ◽  
Homogenizing Annealing ◽  
Arc Melting ◽  
Magnetostrictive Materials

Abstract Polycrystalline TbxDy1-xR0.1Fe2-zCoz (R = Nd, Pr, x = 0.2, 0.3; z = 0, 1.3) cubic Laves phase alloys with MgCu2-type structure were prepared by arc melting followed by homogenizing annealing. The crystal structure, magnetic properties, and magnetostriction have been investigated. Compounds with high values of magnetostrictive susceptibility were found in the temperature range 150-300 K. Compounds with partial substitution of cobalt for iron demonstrate a change in the sign of anisotropic magnetostriction. This work continues the search for magnetostrictive materials with inexpensive neodymium and praseodymium.

scholarly journals Electronic and Magnetic Properties of Li1.5Mn0.5As Alloys in the Cu2Sb Structure

2013 ◽  
Vol 702 ◽  
pp. 231-235 ◽  
Author(s):  
C.Y. Fong ◽  
Liam Damewood ◽  
L.H. Yang ◽  
C. Felser
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Ab Initio ◽  
Lattice Constant ◽  
Magnetic Moments ◽  
The Other ◽  
Half Metallicity ◽  
Ionic Model ◽  
Half Metals ◽  
Ferromagnetic Metals

We investigated two formula-units of Li1.5Mn0.5As alloys, such as Li3MnAs2, in the Cu2Sb crystal structure using an ab-initio algorithm. By interchanging Mn with each Li located at different positions of the Li4As2unit cell, four separate alloys are formed. At the optimized lattice constant, two of these alloys are predicted to be ferromagnetic metals and the other two are half metals. The possibility of half metallicity in the first two is also explored. Both the modified Slater-Pauling-Kübler rule and the ionic model can characterize the magnetic moments of the half metals.

Magnetic Properties and Specific Heat Studies of the Plumbides CeTPb (T = Cu, Pd, Ag, Au)

2007 ◽  
Vol 62 (7) ◽  
pp. 901-906 ◽  
Author(s):  
Wilfried Hermes ◽  
Sudhindra Rayaprol ◽  
Rainer Pöttgen
Keyword(s):  
Magnetic Properties ◽  
Specific Heat ◽  
High Frequency ◽  
Magnetic Moments ◽  
Type Structure ◽  
Space Group ◽  
Structure Space ◽  
Trivalent Cerium ◽  
Gold Compounds

Abstract The cerium plumbides CeCuPb, CePdPb, CeAgPb, and CeAuPb have been synthesized from the elements in sealed tantalum tubes in a high-frequency furnace followed by annealing. The copper, silver and gold compounds crystallize with the NdPtSb-type structure, space group P63mc: a = 466.1(2), c = 778.1(3) pm for CeCuPb, a = 484.8(2), c = 773.0(3) pm for CeAgPb, and a = 480.24(9), c = 772.9(2) pm for CeAuPb. CePdPb crystallizes with the ZrNiAl-type structure: P6̅2m, a = 775.0(2), c = 413.32(8) pm. The dc susceptibility measurements show trivalent cerium for all four plumbides with experimental magnetic moments of 2.53(2), 2.71(2), 2.63(2), and 2.58(2) μB/Ce atom for CeCuPb, CePdPb, CeAgPb, and CeAuPb, respectively. The compounds CeCuPb, CeAgPb, and CeAuPb, studied by dc susceptibility and specific heat measurements, order antiferromagnetically at N´eel temperatures of 8.2(1), 7.4(1), and 3.7(1) K, respectively.

Synthesis, crystal structure, vibrational spectroscopy and expected magnetic properties of a new bismuth nickel phosphate Ni(BiO) 2 (PO 4 )(OH) with a namibite-type structure

2017 ◽  
Vol 63 ◽  
pp. 16-22 ◽  
Author(s):  
Sergey M. Aksenov ◽  
Vladimir S. Mironov ◽  
Elena Yu. Borovikova ◽  
Natalia A. Yamnova ◽  
Olga A. Gurbanova ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Vibrational Spectroscopy ◽  
Type Structure ◽  
Nickel Phosphate

scholarly journals Synthesis, Structure and Thermophysical Properties of Phosphates MNi0.5Zr1.5(PO4)3 (M = Mg, Ca, Sr)

2010 ◽  
Vol 12 (3,4) ◽  
pp. 241 ◽  
Author(s):  
M.V. Sukhanov ◽  
I.A. Schelokov ◽  
V.I. Pet'kov ◽  
E.R. Gobechiya ◽  
Yu.K. Kabalov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Heat Capacity ◽  
Thermal Expansion ◽  
High Temperature ◽  
Single Phase ◽  
Rietveld Method ◽  
Type Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Expansion Behavior

<p>New phosphates MNi<sub>0.5</sub>Zr<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> (M = Mg, Ca, Sr) were prepared by the precipitating method.<strong><em> </em></strong>Phosphates were characterized using X-ray powder diffraction, IR-spectroscopy and electron microprobe analyses. The crystal structure of phosphates was refined by the Rietveld method. Phosphates CaNi<sub>0.5</sub>Zr<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> and SrNi<sub>0.5</sub>Zr<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> are shown to have been crystallized in the NaZr<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>-type structure and the phosphate MgNi<sub>0.5</sub>Zr<sub>1.5</sub>(PO<sub>4</sub>)<sub>3 </sub>was obtained as a single-phase with Sc<sub>2</sub>(WO<sub>4</sub>)<sub>3</sub>-type structure. Heat capacity of phosphate CaNi<sub>0.5</sub>Zr<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> was measured in the range 7 – 650 K and increased monotonically over the entire temperature range studied. Thermal expansion of phosphate CaNi<sub>0.5</sub>Zr<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> was studied in the interval 295-1073 K by the high temperature X-ray diffraction. This phosphate is similar to the best low-expansion ceramics, such as zircon, cordierite and silica glass in thermal expansion behavior.</p>

Magnetic Properties of Compounds RE2Cu2Mg (RE = Y, La, Pr, Nd)

2003 ◽  
Vol 58 (6) ◽  
pp. 497-500 ◽  
Author(s):  
Gunter Kotzybaa ◽  
Ratikanta Mishrab ◽  
Rainer Pöttgena
Keyword(s):  
Magnetic Properties ◽  
High Frequency ◽  
Remanent Magnetization ◽  
Magnetic Transition ◽  
Magnetic Moments ◽  
Temperature Dependent ◽  
Furnace Temperature ◽  
Pauli Paramagnetism ◽  
Magnetization Behavior ◽  
Curie Temperatures

The Mo2FeB2 type magnesium intermetallics RE2Cu2Mg (RE = Y, La, Pr, Nd) were synthesized from the elements by reactions in sealed tantalum tubes in a high-frequency furnace. Temperature-dependent magnetic susceptibility measurements of Y2Cu2Mg and La2Cu2Mg indicate Pauli paramagnetism. Pr2Cu2Mg and Nd2Cu2Mg show Curie-Weiss behaviour with experimental magnetic moments of 3.67(2) μB/Pr and 3.47(2) μB/Nd, respectively. Both compounds are ordered ferromagnetically at Curie temperatures of 12.0(5) (Pr2Cu2Mg) and 43.0(5) K (Nd2Cu2Mg). Pr2Cu2Mg shows a very complex magnetization behavior with an additional magnetic transition around 2.5 T. The neodymium compound shows a pronounced square loop behavior in the magnetization at 4.5 K with a high remanent magnetization of 1.55(1) μB/Nd atom and a coercive field of 0.31(1) T.

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