Tunable thermal hysteresis in MnFe(P,Ge) compounds

Trung, N. T.; Ou, Z. Q.; Gortenmulder, T. J.; Tegus, O.; Buschow, K. H. J.; Brück, E.
March 2009
Applied Physics Letters;3/9/2009, Vol. 94 Issue 10, pN.PAG
Academic Journal
Structural, magnetic, and magnetocaloric properties of the MnFe(P,Ge) compounds were systematically studied on both bulk alloys and melt-spun ribbons. The experimental results show that the critical behavior of the phase transition can be controlled by changing either the compositions or the annealing conditions. The thermal hysteresis is found to be tunable. It can reach very small values, while maintaining a large magnetocaloric effect in a large range of working temperatures and under field changes that may be produced by conventional permanent magnets. Consequently, an effective way in producing ideal magnetic refrigerants for room-temperature applications is suggested.


Related Articles

  • The Effect of Deformation on Microstructure of Cu-Ni-Sn Aging Alloys. Le Thi Chieu; Sai Manh Thang; Nguyen Duong Nam; Khanh, Pham Mai // Key Engineering Materials;2016, Vol. 682, p113 

    This paper presents the effect of deformation on the change of microstructure of Cu-15Ni-8Sn and Cu-9Ni-6Sn alloy during heat treatment. The samples were homogenized, quenched, cold-rolled at different thickness reduction, and aged. The effects of deformation on microstructures were observed by...

  • Iron-Rich Intermetallic Phases and Their Role in Casting Defect Formation in Hypoeutectic Al-Si Alloys. Lu, L.; Dahle, A. K. // Metallurgical & Materials Transactions. Part A;Mar2005, Vol. 36 Issue 3A, p819 

    Iron is the most common and detrimental impurity in aluminum casting alloys and has long been associated with an increase in casting defects. While the negative effects of iron are clear, the mechanism involved is not fully understood. It is generally believed to be associated with the formation...

  • Small sealed Ta crucible for thermal analysis of volatile metallic samples. Janssen, Y.; Angst, M.; Dennis, K. W.; Canfield, P. C.; McCallum, R. W. // Review of Scientific Instruments;May2006, Vol. 77 Issue 5, p056104 

    Differential thermal analysis on metallic alloys containing volatile elements can be highly problematic. Here we show how measurements can be performed in commercial, small-sample equipment without modification. This is achieved by using a sealed Ta crucible, easily fabricated from Ta tubing and...

  • Advanced Fabrication Technique and Thermal Performance Prediction of U-Mo/Zr-alloy Dispersion Fuel Pin for High Burnup PWR. Suwardi // AIP Conference Proceedings;6/22/2010, Vol. 1244 Issue 1, p145 

    In recent years, a novel class of zirconium alloys having the melting temperature of 990–1160 K has been developed. Based on novel zirconium matrix alloys, high uranium content fuel pin with U-9Mo has been developed according to capillary impregnation technique. The pin shows it is...

  • Redetermination of the Eutectic Composition of the Co-Sn Binary Alloy. Liu, L.; Li, J.; Zhao, S.; Zhou, Y. // Journal of Phase Equilibria & Diffusion;Jun2009, Vol. 30 Issue 3, p242 

    A series of Co-Sn alloys was solidified. It was found that the as-cast microstructure of the Co-20.5at.%Sn alloy, which on the basis of literature reports has long been thought to be the eutectic composition, contains much primary phase besides lamellar eutectics. The cooling curve of this alloy...

  • Combinatorial search of thermoelastic shape-memory alloys with extremely small hysteresis width. Cui, Jun; Chu, Yong S.; Famodu, Olugbenga O.; Furuya, Yasubumi; Hattrick-Simpers, Jae.; James, Richard D.; Ludwig, Alfred; Thienhaus, Sigurd; Wuttig, Manfred; Zhiyong Zhang; Takeuchi, Ichiro // Nature Materials;Apr2006, Vol. 5 Issue 4, p286 

    Reversibility of structural phase transformations has profound technological implications in a wide range of applications from fatigue life in shape-memory alloys (SMAs) to magnetism in multiferroic oxides. The geometric nonlinear theory of martensite universally applicable to all structural...

  • Modification of eutectic silicon in Al–Si alloys. Hegde, Sathyapal; Prabhu, K. Narayan // Journal of Materials Science;May2008, Vol. 43 Issue 9, p3009 

    The mechanical properties of Al–Si alloys are strongly related to the size, shape and distribution of eutectic silicon present in the microstructure In order to improve mechanical properties, these alloys are generally subjected to modification melt treatment, which transforms the...

  • Thermal analysis of two Fe-X-B (X=Nb, ZrNi) alloys prepared by mechanical alloying. Suñol, J. J.; González, A.; Saurina, J. // Journal of Thermal Analysis & Calorimetry;2003, Vol. 72 Issue 1, p329 

    The alloys, Fe60Ni14Zr6B20 and Fe85Nb9B6, were produced by mechanical alloying. The formation of the nanocrystallites (about 40 nm) was detected by X-ray diffraction. Furthermore, a slight oxygen presence (<3 at.%) was found by induced-coupled plasma and EDX microanalysis. After milling,...

  • Hysteresis and phase transitions for one-dimensional and three-dimensional models in shape memory alloys. Berti, V.; Fabrizio, M.; Grandi, D. // Journal of Mathematical Physics;Jun2010, Vol. 51 Issue 6, p062901 

    By means of the Ginzburg–Landau theory of phase transitions, we study a nonisothermal model to characterize the austenite-martensite transition in shape memory alloys. In the first part of this paper, the one-dimensional model proposed by Berti et al. [“Phase transitions in shape...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics