Multiple magnetic transitions and magnetocaloric effect in hydrothermally synthesized single crystalline La0.5Sr0.5MnO3nanowires

2012 ◽  
Vol 1454 ◽  
pp. 63-68 ◽  
Author(s):  
Sayan Chandra ◽  
Anis Biswas ◽  
Subarna Datta ◽  
Barnali Ghosh ◽  
A.K. Raychaudhuri ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Low Temperature ◽  
Magnetocaloric Effect ◽  
Room Temperature ◽  
Magnetic State ◽  
Double Exchange ◽  
Synthesis Process ◽  
Theoretical Studies ◽  
Magnetic Transitions ◽  
Magnetocaloric Properties

ABSTRACTWe have successfully prepared La0.5Sr0.5MnO3nanowires using a novel hydrothermal synthesis process and studied their magnetic and magnetocaloric properties. The system exhibits an inverse magnetocaloric effect (IMCE) around 175 K indicating presence of significant AFM correlation. The MCE study reveals a clear paramagnetic (PM) to ferromagnetic (FM) transition near room temperature (T ~ 325K) which is followed by onset of AFM at lower temperatures. The development of the FM-like magnetic state at low temperature is attributed to the enhanced double exchange (DE) driven ferromagnetism in AFM state as predicted by recent theoretical studies.

Preparation and Magnetic Property of Bi2Fe4O9 Nanoparticles by Hydrothermal Method

2008 ◽  
Vol 368-372 ◽  
pp. 112-114 ◽  
Author(s):  
Hong Yan Miao ◽  
Zhi Wei Yu ◽  
Guo Qiang Tan
Keyword(s):  
Magnetic Property ◽  
Hydrothermal Synthesis ◽  
Low Temperature ◽  
Sodium Hydroxide ◽  
Room Temperature ◽  
Magnetic Measurements ◽  
Synthesis Process ◽  
Sem Images ◽  
One Step ◽  
Nitrate Nonahydrate

Bi2Fe4O9 nanoparticles were prepared at low temperature via a facile, one-step hydrothermal synthesis process using iron(III) nitrate nonahydrate (Fe(NO3)3•9H2O) and bismuth nitrate pentahydrate (Bi(NO3)3•5H2O) as starting materials and sodium hydroxide (NaOH) as precipitant and mineralizer. XRD results indicated that the as-prepared nanoparticles are pure orthorhombic Bi2Fe4O9. SEM images revealed that the as-prepared Bi2Fe4O9 nanoparticles have a sheet-like morphology. They are paramagnetic at room temperature demonstrated by the magnetic measurements.

scholarly journals Experimental and Theoretical Studies of the Gas-Phase Reactions of O(1D) with H2O and D2O at Low Temperature

2021 ◽  
Author(s):  
Kevin M. Hickson ◽  
Somnath Bhowmick ◽  
Yury V. Suleimanov ◽  
João Brandão ◽  
Daniela V. Coelho
Keyword(s):  
Low Temperature ◽  
Gas Phase ◽  
Room Temperature ◽  
Theoretical Study ◽  
Theoretical Studies ◽  
Gas Phase Reactions ◽  
Experimental And Theoretical Studies

Here we report the results of an experimental and theoretical study of the gas-phase reactions between O(1D) and H2O and O(1D) and D2O at room temperature and below. On the...

Observation of enhanced magnetocaloric properties with A-site deficiency in La0.67Sr0.33MnO3 manganite

2018 ◽  
Vol 47 (43) ◽  
pp. 15512-15522 ◽  
Author(s):  
B. Arun ◽  
V. R. Akshay ◽  
M. Vasundhara
Keyword(s):  
Exchange Interaction ◽  
Magnetocaloric Effect ◽  
Double Exchange ◽  
Double Exchange Interaction ◽  
Magnetocaloric Properties ◽  
A Site

Introduction of a deficiency at the A-site of La0.67Sr0.33MnO3 enhanced the magnetocaloric effect due to the multiple double exchange interaction.

scholarly journals Gaudefroyite: a mineral with excellent magnetocaloric effect suitable for liquefying hydrogen

2018 ◽  
Vol 6 (13) ◽  
pp. 5260-5264 ◽  
Author(s):  
Rukang Li ◽  
Guangjing Li ◽  
Colin Greaves
Keyword(s):  
Low Temperature ◽  
Magnetocaloric Effect ◽  
Natural Mineral ◽  
Magnetocaloric Properties

A natural mineral, gaudefroyite, displays excellent low temperature magnetocaloric properties that are suitable for liquefying hydrogen.

Magnetic and magnetocaloric properties of Dy5Pd2: role of magnetic irreversibility

RSC Advances ◽  
2015 ◽  
Vol 5 (59) ◽  
pp. 47860-47865 ◽  
Author(s):  
Tapas Paramanik ◽  
Tapas Samanta ◽  
R. Ranganathan ◽  
I. Das
Keyword(s):  
Intermetallic Compound ◽  
Low Temperature ◽  
Magnetocaloric Effect ◽  
Temperature Region ◽  
Magnetocaloric Properties ◽  
Magnetic Irreversibility

In this report the origin of giant inverse magnetocaloric effect at low temperature region has been studied in cluster glass intermetallic compound Dy5Pd2. In this context the procedure to obtain reversible magnetocaloric effect using Maxwell’s relation has been described.

The Magnetocaloric Effect and Magnetic Transitions in Hydride Compounds: GdNiH3.2 and TbNiH3.4

2015 ◽  
Vol 233-234 ◽  
pp. 243-246
Author(s):  
A.I. Smarzhevskaya ◽  
S.A. Nikitin ◽  
Viktor N. Verbetsky ◽  
Wacław Iwasieczko ◽  
Alexey N. Golovanov
Keyword(s):  
Magnetocaloric Effect ◽  
Magnetic Entropy Change ◽  
Entropy Change ◽  
Magnetic Entropy ◽  
Magnetic Transitions ◽  
Isothermal Magnetization ◽  
Magnetocaloric Properties ◽  
Magnetization Data

The paper presents the investigation of GdNiH3.2 and TbNiH3.4 hydrides magnetic transitions and magnetocaloric properties. The isothermal magnetization data in the fields up to 5T are obtained for GdNi and TbNi compounds and their hydrides and the values of magnetic entropy change are calculated. The maximum values of magnetic entropy change ΔSM in GdNiH3.2 and TbNiH3.4 are extremely large. It is shown that the hydrogenation shifts ΔSM(T) maximum to lower temperatures.

scholarly journals Новые магнитные материалы на основе соединений RNi для криогенной техники

2020 ◽  
Vol 46 (6) ◽  
pp. 51
Author(s):  
В.Б. Чжан ◽  
И.С. Терёшина ◽  
А.А. Курганская ◽  
С.А. Лушников ◽  
В.Н. Вербецкий ◽  
...  
Keyword(s):  
Low Temperature ◽  
Curie Temperature ◽  
Magnetocaloric Effect ◽  
Temperature Region ◽  
Partial Substitution ◽  
Temperature Range ◽  
Magnetocaloric Properties ◽  
Cryogenic Engineering ◽  
Significant Change ◽  
Curie Temperature Tc

Magnetocaloric properties of compounds Gd(Ni0.98Si0.02), Dy(Ni0.95Si0.05) and their hydrides Gd(Ni0.98Si0.02)H3, Dy(Ni0.95Si0.05)H4 were investigated in the temperature range 2 – 100K. It was found that partial substitution of Ni atoms by Si atoms, as well as subsequent hydrogenation can lead to a significant change in the Curie temperature (TC), the magnetocaloric effect, and the temperature at which the maximum MCE (Tmax) is observed. It is shown that the TC and Tmax of the hydrides are shifted by several degrees to the low temperature region with increasing or maintaining the MCE, which can significantly expand the application of such materials in cryogenic engineering.

scholarly journals Low-Temperature Magnetocaloric Properties of V12 Polyoxovanadate Molecular Magnet: A Theoretical Study

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4399 ◽  
Author(s):  
Karol Szałowski
Keyword(s):  
Low Temperature ◽  
Magnetocaloric Effect ◽  
Computational Study ◽  
Thermodynamic Description ◽  
Entropy Change ◽  
Molecular Magnet ◽  
Thermodynamic Quantities ◽  
Magnetocaloric Properties ◽  
Adiabatic Magnetization ◽  
Quantities Of Interest

The paper presents a computational study of the magnetocaloric properties of the V12 polyoxovanadate molecular magnet. The description is restricted to low-temperature range (below approximately 100 K), where the magnetic properties of the system in question can be sufficiently modelled by considering a tetramer that consists of four vanadium ions with spins S=1/2. The discussion is focused on the magnetocaloric effect in the cryogenic range. The exact and numerical diagonalization of the corresponding Hamiltonian is used in order to construct the thermodynamic description within a version of the canonical ensemble. The thermodynamic quantities of interest, such as magnetic entropy, specific heat, entropy change under isothermal magnetization/demagnetization, temperature change under adiabatic magnetization/demagnetization, refrigerant capacity, and magnetic Grüneisen ratio, are calculated and discussed extensively. The importance of two quantum level crossings for the described properties is emphasized. The significant ranges of direct and inverse magnetocaloric effect are predicted. In particular, the maximized inverse magnetocaloric response is found for cryogenic temperatures.

Large Magnetocaloric Effect Around Room Temperature in Double-Exchange Ferromagnets Pr1–xSrxMnO3 With Short-Range Interactions

2014 ◽  
Vol 50 (11) ◽  
pp. 1-4
Author(s):  
Tran Dang Thanh ◽  
Thi Anh Ho ◽  
T. V. Manh ◽  
T. L. Phan ◽  
Seong-Cho Yu
Keyword(s):  
Magnetocaloric Effect ◽  
Short Range ◽  
Room Temperature ◽  
Double Exchange
Sign in / Sign up

Export Citation Format

Share Document