Zero-thermal-hysteresis magnetocaloric effect induced by magnetic transition at a morphotropic phase boundary in Heusler Ni50Mn36Sb14−xInx alloys

2018 ◽  
Vol 20 (27) ◽  
pp. 18484-18490 ◽  
Author(s):  
Yin Zhang ◽  
Jieqiong Wang ◽  
Xiaoqin Ke ◽  
Tieyan Chang ◽  
Fanghua Tian ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Phase Boundary ◽  
Magnetocaloric Effect ◽  
Morphotropic Phase Boundary ◽  
Thermal Hysteresis ◽  
Magnetic Transition

Enhanced MCE with zero thermal hysteresis is achieved in Ni50Mn36Sb14−xInx by constructing a MPB-involved phase diagram.

scholarly journals The Phase Diagram and Exotic Magnetostrictive Behaviors in Spinel Oxide Co(Fe1−xAlx)2O4 System

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1685 ◽  
Author(s):  
Chao Zhou ◽  
Azhen Zhang ◽  
Tieyan Chang ◽  
Yusheng Chen ◽  
Yin Zhang ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Magnetic Susceptibility ◽  
Phase Boundary ◽  
Room Temperature ◽  
Magnetic Transition ◽  
Oxide System ◽  
Spinel Oxide ◽  
System Composition ◽  
Temperature Spectra ◽  
System 1

We report the magnetic and magnetostrictive behaviors of the pseudobinary ferrimagnetic spinel oxide system (1−x)CoFe2O4–xCoAl2O4 [Co(Fe1−xAlx)2O4], with one end-member being the ferrimagnetic CoFe2O4 and the other end-member being CoAl2O4 that is paramagnetic above 9.8 K. The temperature spectra of magnetization and magnetic susceptibility were employed to detect the magnetic transition temperatures and to determine the phase diagram of this system. Composition dependent and temperature dependent magnetostrictive behaviors reveal an exotic phase boundary that separates two ferrimagnetic states: At room temperature and under small magnetic fields (∼500 Oe), Fe-rich compositions exhibit negative magnetostriction while the Al-rich compositions exhibit positive magnetostriction though the values are small (<10 ppm). Moreover, the compositions around this phase boundary at room temperature (x = 0.35, 0.4, 0.45, 0.5) exhibit near-zero magnetostriction and enhanced magnetic susceptibility, which may be promising in the applications for magnetic cores, current sensors, or magnetic shielding materials.

scholarly journals Giant magnetocaloric effect in composites based on polymeric matrix and manganese arsenide

2018 ◽  
Vol 185 ◽  
pp. 05010 ◽  
Author(s):  
Nikolay Pankratov ◽  
Victor Mitsiuk ◽  
Alexander Vetcher ◽  
Andrei Krokhotin ◽  
Gennadiy Govor ◽  
...  
Keyword(s):  
Magnetocaloric Effect ◽  
Thermal Hysteresis ◽  
Polymer Matrix Composites ◽  
Direct Method ◽  
Magnetic Transition ◽  
Polymeric Composite ◽  
Ferromagnetic State ◽  
Heat Pumps ◽  
Temperature Hysteresis ◽  
Manganese Arsenide

A field and/or temperature hysteresis is more than just an interesting incomprehensibility that occurs in materials with a first-order magnetic transition. Indeed, the reversibility of the magnetocaloric effect (MCE), being essential for magnetic heat pumps, strongly depends on the width of the thermal hysteresis and, therefore, it is necessary to find solutions to minimize losses associated with thermal hysteresis in order to maximize the efficiency of magnetic cooling devices. In this work, the polymer matrix composites with MnAs powder as reinforcing material were obtained and its MCE by direct method was studied. The influence of composite preparation process on the MCE was investigated. It was found that the MCE of bulk MnAs shows strong temperature hysteresis caused by magnetostructural transition from paramagnetic to ferromagnetic state, which also leads to an irreversible MCE at cooling at first magnetization. The reversible MCE of bulk MnAs in field 12.5 kOe is ΔT ∼ 0.4 K. It was shown that Mn-based polymeric composite cured in aligned magnetic field presents a reinforcement of the MCE temperature hysteresis. Thus, the MCE value in aligned composite is less than the value of the MCE in the bulk MnAs. It was shown that the decreasing of linear size of MnAs grains in the polymeric composite leads to sharp decreasing of the MCE to value of 0.05 K. It was established that the optimal properties, such as giant MCE and low temperature hysteresis, are found for composite hardened under pressure of 10 kBar. In this composite an increase of reversible MCE (compared to the bulk MnAs) till to the value of ΔT ∼ 1.2K was observed.

Phase diagram for the 0.3Pb(Zn1/3Nb2/3)O3–0.7Pb0.96La0.04(ZrTi)0.99O3solid solution in the vicinity of morphotropic phase boundary

2005 ◽  
Vol 38 (14) ◽  
pp. 2452-2459 ◽  
Author(s):  
Guochu Deng ◽  
Aili Ding ◽  
Xinsen Zheng ◽  
Wenxiu Cheng ◽  
Qingrui Yin
Keyword(s):  
Phase Diagram ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary

Layered transition metal carboxylates: synthesis, structural aspects and observation of multi-step magnetic transition through phase diagram

2013 ◽  
Vol 42 (41) ◽  
pp. 14836 ◽  
Author(s):  
Rupam Sen ◽  
Dasarath Mal ◽  
Armandina M. L. Lopes ◽  
Paula Brandão ◽  
João P. Araújo ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Transition Metal ◽  
Magnetic Transition ◽  
Metal Carboxylates ◽  
Layered Transition Metal ◽  
Structural Aspects

Using phase boundary mapping to resolve discrepancies in the Mg2Si–Mg2Sn miscibility gap

2021 ◽  
Author(s):  
Rachel Orenstein ◽  
James P. Male ◽  
Michael Toriyama ◽  
Shashwat Anand ◽  
G. Jeffrey Snyder
Keyword(s):  
Phase Diagram ◽  
Phase Boundary ◽  
Ternary Phase ◽  
Ternary Phase Diagram ◽  
Miscibility Gap ◽  
Boundary Mapping

A new understanding of the MgSi–MgSn miscibility gap is reached through phase boundary mapping the Mg–Si–Sn ternary phase diagram.

Method to Achieve the Morphotropic Phase Boundary in HfxZr1−xO2 by Electric Field Cycling for DRAM Cell Capacitor Applications

2021 ◽  
Vol 42 (4) ◽  
pp. 517-520
Author(s):  
Seongho Kim ◽  
Seung Hwan Lee ◽  
Min Ju Kim ◽  
Wan Sik Hwang ◽  
Hyun Soo Jin ◽  
...  
Keyword(s):  
Electric Field ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Field Cycling
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