Magnetocaloric effect, heat capacity and exchange interactions in nonstoichiometric Er0.65Gd0.35Co2Mn compounds

2022 ◽  
Vol 140 ◽  
pp. 107386
Author(s):  
E.G. Gerasimov ◽  
A.A. Inishev ◽  
N.V. Mushnikov ◽  
P.B. Terentev ◽  
V.S. Gaviko ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Magnetocaloric Effect ◽  
Exchange Interactions

Magnetocaloric and other Properties of Cold Rolled Gd Ribbons

2013 ◽  
Vol 738-739 ◽  
pp. 441-445
Author(s):  
Sergey Taskaev ◽  
Vasiliy D. Buchelnikov ◽  
Anatoliy Pellenen ◽  
Dmitriy Bataev ◽  
Konstantin Skokov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Heat Capacity ◽  
Magnetocaloric Effect ◽  
Treatment Procedure ◽  
Magnetic Cooling ◽  
Cooling Devices ◽  
Cold Rolled ◽  
Heat Treatment Procedure

In this work we investigate magnetocaloric effect and heat capacity of Gd cold rolled ribbons. Such materials are easy to produce, they are flexible and convenient for using in magnetic cooling devices. It is shown that the magnetocaloric effect is strongly dependent on thickness of the ribbons. Severely rolled ribbons demonstrate rather a small magnetocaloric effect. However, a special heat treatment procedure makes it possible to enhance the effect up to the value observed in polycrystalline Gd.

scholarly journals Теплоемкость и магнитокалорический эффект соединений LaFe-=SUB=-11.2-x-=/SUB=-Mn-=SUB=-x-=/SUB=-Co-=SUB=-0.7-=/SUB=-Si-=SUB=-1.1-=/SUB=- (x=0, 0.1, 0.2, 0.3)

2020 ◽  
Vol 62 (5) ◽  
pp. 752
Author(s):  
Н.З. Абдулкадирова ◽  
А.М. Алиев ◽  
А.Г. Гамзатов ◽  
P. Gebara
Keyword(s):  
Heat Capacity ◽  
Magnetic Fields ◽  
Curie Temperature ◽  
Specific Heat ◽  
Magnetocaloric Effect ◽  
Intermetallic Compounds ◽  
Indirect Method ◽  
Direct Method ◽  
Capacity Data ◽  
Value Changes

The specific heat and magnetocaloric effect of the LaFe11.2-хMnxCo0.7Si1.1 intermetallic compounds (x = 0.1, 0.2, 0.3) were measured in the temperature range 80–300 K and in magnetic fields up to 8 T. The magnetocaloric effect (MCE) was estimated using two methods: direct method in cyclic magnetic fields, as well as an indirect method from heat capacity data. It was shown that an increase in the concentration of Mn atoms leads to a shift in the Curie temperature of the TC toward lower temperatures, while the FM value changes slightly.

Magnetic Phase Transitions and Magnetocaloric Effect in R2Fe17 (R = Y, Tb, Er)

2015 ◽  
Vol 233-234 ◽  
pp. 204-207 ◽  
Author(s):  
S.A. Nikitin ◽  
I.A. Ovchenkova ◽  
Georgiy A. Tskhadadze ◽  
Konstantin P. Skokov
Keyword(s):  
Transition Temperature ◽  
Magnetocaloric Effect ◽  
Magnetic Phase ◽  
Magnetic Transition ◽  
Exchange Interactions ◽  
Thermodynamic Theory ◽  
Magnetic Phase Transitions ◽  
Magnetic Transition Temperature ◽  
Local Fluctuations ◽  
Direct Measurements

The direct measurements of the magnetocaloric effect (MCE) and the magnetization for R2Fe17 (R = Y, Tb, Dy) compounds are reported. The maximal values of the MCE for different R2Fe17 compounds are almost the same at the Curie temperature and are equal to 0.8 – 0.85 K at ΛH = 13.5 kOe. The field dependencies of the magnetization and MCE and the dependence of MCE via magnetization deviates from the classical regularities and describes by the thermodynamic theory attracting the higher terms. Obviously the occurrence of the mixed exchange interactions in these compounds leads to the requirement of consideration both thermal and local fluctuations of the exchange integrals near the magnetic transition temperature.

Low temperature heat capacity, standard entropy, standard enthalpy and magnetic property: a new 1D CuII coordination polymer incorporating tetrazole-1-acetic acid and p-nitrobenzoic acid

2017 ◽  
Vol 46 (6) ◽  
pp. 1878-1884 ◽  
Author(s):  
Qi Yang ◽  
Jing Ge ◽  
Xin Liu ◽  
Quan Shi ◽  
Hongshan Ke ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Low Temperature ◽  
Coordination Polymer ◽  
Exchange Interactions ◽  
Standard Entropy ◽  
Antiferromagnetic Exchange ◽  
Property A ◽  
Nitrobenzoic Acid ◽  
Temperature Heat ◽  
Low Temperature Heat Capacity

A new 1D CuII coordination polymer possesses antiferromagnetic exchange interactions, which was confirmed by the low-temperature heat capacity.

scholarly journals Analysis based on scaling relations of critical behaviour at PM–FM phase transition and universal curve of magnetocaloric effect in selected Ag-doped manganites

RSC Advances ◽  
2018 ◽  
Vol 8 (33) ◽  
pp. 18294-18307 ◽  
Author(s):  
S. Tarhouni ◽  
R. M'nassri ◽  
A. Mleiki ◽  
W. Cheikhrouhou-Koubaa ◽  
A. Cheikhrouhou ◽  
...  
Keyword(s):  
Phase Transition ◽  
Heat Capacity ◽  
Magnetocaloric Effect ◽  
Critical Exponents ◽  
Critical Behaviour ◽  
Scaling Relations ◽  
Universal Curve ◽  
Magnetic Entropy ◽  
Heat Capacity Changes ◽  
Doped Manganites

The universal curves of magnetic entropy changes and heat capacity changes for Pr0.5Sr0.5−xAgxMnO3 (0 ≤ x ≤ 0.2) are obtained by using the critical exponents.

scholarly journals Heat capacity and magnetocaloric effect in polycrystalline Gd1−xSmxMn2Si2

2007 ◽  
Vol 319 (1-2) ◽  
pp. 1-4 ◽  
Author(s):  
Pramod Kumar ◽  
Niraj K. Singh ◽  
K.G. Suresh ◽  
A.K. Nigam ◽  
S.K. Malik
Keyword(s):  
Heat Capacity ◽  
Magnetocaloric Effect

A brilliant cryogenic magnetic coolant: magnetic and magnetocaloric study of ferromagnetically coupled GdF3

2015 ◽  
Vol 3 (47) ◽  
pp. 12206-12211 ◽  
Author(s):  
Yan-Cong Chen ◽  
Jan Prokleška ◽  
Wei-Jian Xu ◽  
Jun-Liang Liu ◽  
Jiang Liu ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Magnetocaloric Effect ◽  
Isothermal Magnetization ◽  
Heat Capacity Measurements ◽  
Inorganic Framework

The magnetocaloric effect of an inorganic framework material with repeating GdF3 units has been studied using isothermal magnetization and heat capacity measurements.

Magnetocaloric effect and heat capacity in the phase-transition region

1999 ◽  
Vol 59 (1) ◽  
pp. 503-511 ◽  
Author(s):  
A. M. Tishin ◽  
K. A. Gschneidner ◽  
V. K. Pecharsky
Keyword(s):  
Phase Transition ◽  
Heat Capacity ◽  
Magnetocaloric Effect ◽  
Transition Region ◽  
Phase Transition Region

scholarly journals Features of Magnetocaloric Effect in Er(Co-Fe)2 Laves Phases

2016 ◽  
Vol 1 (1) ◽  
pp. 5 ◽  
Author(s):  
M.S. Anikin ◽  
E.N. Tarasov ◽  
N.V. Kudrevatykh ◽  
M.A. Semkin ◽  
A.S. Volegov ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Phase Composition ◽  
Magnetocaloric Effect ◽  
Magnetic Entropy Change ◽  
Entropy Change ◽  
Magnetic Entropy ◽  
Concentration Increase ◽  
Laves Phases ◽  
X Ray ◽  
Temperature Range

<p>In this work the results of measurements of heat capacity (C<sub>P</sub>) and magnetocaloric effect (MCE) in Er(Co<sub>1-</sub><sub>х</sub>Fe<sub>х</sub>)<sub>2</sub> system in the concentration range 0.07 ≤ x ≤ 0.80 are presented. Phase composition was controlled by X-ray difraction analysis. Heat capacity was measured in the temperature range 77-320 K. MCE has been studied within the temperature range 5-670 K in magnetic fields up to 70 kOe. It was found that Fe concentration increase caused the table-like (plateau) MCE temperature dependence for both magnetic entropy change date and direct ∆T-effect measurements independently on Fe concentration. The possible reasons of such behavior are discussed.</p>

Sign in / Sign up

Export Citation Format

Share Document