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Magnetic entropy change involving martensitic transition in NiMn-based Heusler alloys

Chinese Physics B 2013年第3期22卷 1-15页

作者：胡凤霞沈保根孙继荣 State Key Laboratory for Magnetism Institute of PhysicsChinese Academy of Sciences

Our recent progress on magnetic entropy change（S） involving martensitic transition in both conventional and metamagnetic NiMn-based Heusler alloys is *** the conventional alloys,where both martensite and austenite exhibit ferromagnetic（FM） behavior but show different magnetic anisotropies,a positive S as large as 4.1 J·kg^-1·K^-1 under a field change of 0-0.9 T was first observed at martensitic transition temperature T M～197 *** adjusting the Ni：Mn：Ga ratio to affect valence electron concentration e/a,T M was successfully tuned to room temperature,and a large negative S was observed in a single *** △S attained 18.0 J·kg^-1·K^-1 under a field change of 0-5 *** also focused on the metamagnetic alloys that show mechanisms different from the conventional *** was found that post-annealing in suitable conditions or introducing interstitial H atoms can shift the T M across a wide temperature range while retaining the strong metamagnetic behavior,and hence,retaining large magnetocaloric effect（MCE） and magnetoresistance（MR）.The melt-spun technique can disorder atoms and make the ribbons display a B2 structure,but the metamagnetic behavior,as well as the MCE,becomes weak due to the enhanced saturated magnetization of *** also studied the effect of Fe/Co co-doping in Ni 45（Co1-xFex）5 Mn36.6In13.4 metamagnetic *** of Fe atoms can assist the conversion of the Mn-Mn coupling from antiferromagnetic to ferromagnetic,thus maintaining the strong metamagnetic behavior and large MCE and ***,a small thermal hysteresis but significant magnetic hysteresis was observed around TM in Ni51Mn49-xInx metamagnetic systems,which must be related to different nucleation mechanisms of structural transition under different external perturbations.

关键词： magnetic entropy change martensitic transition NiMn-based Heusler alloys

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Determination of the magnetocaloric effect associated with martensitic transition in Ni_(46)Cu_(4)Mn_(38)Sn_(12) and Ni_(50)CoMn_(34)In_(15) Heusler alloys

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Chinese Physics B 2011年第4期20卷 471-475页

作者：李哲敬超张浩雷曹世勋张金仓 Department of Physics Shanghai University

This paper presents a study of the inverse magnetocaloric effect （MCE） corresponding to martensitic transition using various experimental approaches for Ni46Cu4Mn38Sn12 and NisoCoMn34In]5 Heusler alloy. Through heat capacity measurements, it is found that the ＂giant inverse MCE＂ upon martensitic transition evaluated by the Maxwell relation in these alloys are unphysical results. This is due to the coexistence of both martensitic and austenitic phases, as well as thermal hysteresis during martensitic transition. However, careful study indicates that the spurious results during martensitic transition can be removed using a Clausius Clapeyron equation based on magnetization measurements.

关键词： Heusler alloy martensitic transition magnetocaloric effect

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transition-layer of coreerim structures andβ→a transformation in SiC ceramics

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Journal of Materiomics 2023年第2期9卷 299-309页

作者： Qing-Qing Shao Hui Gu Materials Genome Institute School of Materials Science and EngineeringShanghai UniversityShanghai200444China

Similar to Si_(3)N_(4)ceramics,β→a phase transformation in SiC ceramics plays a key role in tailoring the microstructures thus optimizing related *** microstructures are dominated with the core erim structures by AlN-solution,and by EBSD analysis,a-lamellae were revealed as stacking-faults(SF)and twin-boundaries(TB)in b-grains,co-existing with the coreerim structures asα/β→α’/β’transformation by *** structural transformation can proceed much further by gas-pressuresintering than hot-pressing with only RE2O3 agents,while the latter retain a high-density of SF/TB in the metastable b-SiC *** high-angle secondary-electron imaging,nanoscale transition-layer(TL)was observed as an inter-phase to fully separate the core and rim,which is created by a transitory equilibrium in the solutionereprecipitation *** enrichment of AlN or RE in TL demonstrates their segregation to core surface until reaching the super-saturation and before the growth of *** higher AlN or RE solution and after sintering,a shear stress can develop from TL contour to drive the expansion of SF/TB in martensitic transition,especially under an external isotropic *** combinations ofβ→a transformation,coreerim structures and viscous liquid-phase enable the comprehensive assessment of sintering-microstructure-property-performance relationship of SiC ceramics,as demonstrated for their creep behaviors and fracture toughness.

关键词： SiC ceramics Coreerim structures transition-layer martensitic transition Creep behaviors

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Regular Pattern of Morphology transition in Mixed Martensite Structures

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Journal of Materials Science & Technology 1990年第6期6卷 439-443页

作者：贡海张修睦 Department of Materials Dalian Railway InstituteDalian116022 China. Institute of Metal Research Academia SinicaShenyang110015China.

The morphology and substructure of mixed martensites in ferrous alloys have been examined by using optical and transmission electron microscope. The results indicated that the main formation se- quence of martensitic morphology was butterfly→ plate→lath,with decreasing forming temperatures when the plastic accommodation takes place in the parent phase,which is affected by the transforma- tion strain fié*** was shown that the martensite morphology is not only decided by the forming temperature alone,but also by the dislocation struc- ture in austenite before the transformation.

关键词： martensite morphology martensitic transition dislocation structure

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martensitic transformation and giant magnetic entropy change in Ni_(42.8)Mn_(40.3)Co_(5.7)Sn_(11.2) alloy

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Chinese Physics B 2014年第6期23卷 514-518页

作者：陈峰华宫长伟郭艳萍张敏刚柴跃生 College of Mechanical Engineering Heavy Machinery Engineering Research Center of Ministry of Education of ChinaTaiyuan University of Science and Technology Department of Physics School of Applied Science Taiyuan University of Science and Technology College of Materials Science and Engineering Taiyuan University of Science and Technology

The crystal structure, phase transition, and magnetocaloric effect in Ni42.8Mn40.3Co5.7Sn11.2 alloy are investigated by structure analysis and magnetic measurements. A large magnetic entropy change of 45.6 J/kg.K is obtained at 215 K under a magnetic field of 30 kOe （1 Oe = 79.5775 A.m-1）. The effective refrigerant capacity of Ni42.8Mn40.3Co5.7Sn11.2 alloy reaches 72.1 J/kg under an applied field changing from 0 to 30 kOe. The external magnetic field shifts the martensitic transition temperature about 3-4 K/10 kOe towards low temperature, indicating that magnetic field can retard the phase transition to a certain extent. The origin of large magnetic entropy change is discussed in the paper.

关键词： Ni-Mn-Sn refrigerant capacity martensitic transition magnetic entropy change

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Smart molecular crystal switches

Smart Molecules

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Smart Molecules 2024年第1期2卷 9-24页

作者： Ian Cheng-Yi Hou Liang Li Hongyu Zhang Panče Naumov Smart Materials Lab New York University Abu DhabiAbu DhabiUnited Arab Emirates State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchunChina Center for Smart Engineering Materials New York University Abu DhabiAbu DhabiUnited Arab Emirates Research Center for Environment and Materials Macedonian Academy of Sciences and ArtsSkopjeMacedonia Department of Chemistry Molecular Design InstituteNew York UniversityNew YorkUSA

The multifaceted switches are part of our everyday life from the macroscopic to the molecular world.A molecular switch operating in the solution and in the crystalline state is very *** this review,we summarize the state-of-the-art of smart molecular crystal switches based on molecular *** crystal switches respond to external stimuli and reversibly change between states,retaining their macroscopic *** operation of the switches predominantly relies on temperature alterations or mechanical stress,with emerging methods based on photothermal effects,photoisomerization,and host-guest *** capability of changing the molecular orientation and interaction in smart molecular crystal switches offers opportunities in several applications,including actuators,reversibly shaping structural materials,optoelectronic and magnetic materials,as well as switchable porous *** molecular crystal switches have vast potential in modern scientific and technological *** ongoing research shapes a rich landscape for innovation and future scientific exploration across diverse disciplines.

关键词： martensitic transition molecular switch phase transition single crystal smart material

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