通过熔体快淬制备了 Gd59 Co41、Gd56 Co44非晶条带,并对Gd56 Co44非晶条带进行588 K、10 min的晶化处理.利用 X 射线衍射仪(XRD)分析了合金的结构,通过综合物性测量系统(PPMS)研究了合金的磁性及磁热效应.结果表明,Gd59 Co41和 Gd56 Co44非晶条带的初始晶化温度分别为523和544 K；Gd56 Co44非晶条带晶化处理后获得了 Ho4 Co3型六方单相.非晶态和晶态合金在居里温度附近都发生铁磁到顺磁的二级相变.随着Gd/Co比例的降低,Gd59 Co41和Gd56 Co44非晶合金的居里温度(TC )从198 K 提高到217 K；晶化处理后 Gd56 Co44合金的居里温度为218 K,与非晶态合金相比变化甚微.在ΔH＝5 T时, Gd59 Co41和Gd56 Co44非晶合金的最大磁熵变(-ΔSM)和制冷能力(RC)分别为7．7 J/kg·K、525 J/kg和6．6 J/kg·K、544 J/kg；而 Gd56 Co44晶态合金的最大磁熵变(-ΔSM)和制冷能力(RC)分别为5．6 J/kg·K 和528 J/kg.大的磁熵变和制冷能力,几乎可以忽略的矫顽力和热滞/磁滞效应,表明 Gd-Co 二元非晶和晶态系列合金是200 K温区附近一类具有潜在应用价值的磁制冷工质.
Gd59 Co41 and Gd56 Co44 amorphous ribbons were prepared by arc melt spinning,and then Gd56 Co44 amorphous ribbon was crystallized at 588 K for 10 min.By means of X-ray diffraction (XRD)and physical prop-erty measurement system (PPMS),the structure,magnetic properties and magnetocaloric effect of the alloys were investigated.The results show that the onset crystallization temperatures Tx for the Gd59 Co41 and Gd56 Co44 amorphous ribbons were found to be about 523 and 544 K,respectively.The Ho4 Co3-type hexagonal phase was obtained for crystallized Gd56 Co44 ribbons after annealing.All the amorphous and crystallized alloys undergo fer-romagnetic to paramagnetic second-order transition at their Curie temperatures.The Curie temperature (TC)of the amorphous Gd59Co41 and Gd56Co44 alloy enhances from 198 to 217 K with decreasing the Gd/Co ratio.And the TC of crystallized Gd56 Co44 alloy was 218 K,which has little change compared with that of the amorphous alloy.For a magnetic field change of 5 T,the maximum magnetic entropy change (-ΔSM)and refrigerant ca-pacity (RC)of Gd59 Co41 and Gd56 Co44 amorphous alloys were 7.7 J/(kg??K),525 J/kg and 6.6 J/(kg·K), 544 J/kg,respectively.However,these values of crystallized Gd56 Co44 alloy are 5.6 J/(kg·K)and 528 J/kg. Large magnetic entropy change and magnetocaloric effect,negligible coercive force and thermal/magnetic hys-teresis make Gd-Co binary amorphous and crystallized alloys as the potential candidates for the magnetic refrige-ration materials working in the vicinity of 200 K.
参考文献
| [1] | Franco, V.;Blázquez, J.S.;Ingale, B.;Conde, A..The magnetocaloric effect and magnetic refrigeration near room temperature: Materials and models (Review)[J].Annual review of materials research,2012:305-342. |
| [2] | Gschneidner K A Jr;Pecharsky V K .Thirty years of near room temperature magnetic cooling:where we are today and future prospects[J].International Journal of Refrigeration,2008,31:945. |
| [3] | Bruck E;Tegus O;Thanh D T C et al.Magnetocaloric refrigeration near room temperature(invited)[J].Journal of Magnetism and Magnetic Materials,2007,310:2793. |
| [4] | Dan'kov SY.;Pecharsky VK.;Gschneidner KA.;Tishin AM. .Magnetic phase transitions and the magnetothermal properties of gadolinium[J].Physical Review.B.Condensed Matter,1998(6):3478-3490. |
| [5] | 钟喜春,曾德长,刘正义,魏兴钊.室温磁致冷合金Pr2Fe17-xCox的结构、磁性和磁熵变[J].稀有金属材料与工程,2005(10):1537-1540. |
| [6] | Mandal K;Yan A;Kerschl P et al.The study of magne-tocaloric effect in R2 Fe17(R=Y,Pr)alloys[J].Journal of Physics D:Applied Physics,2004,37:2628. |
| [7] | Pecharsky VK;Gschneidner KA .Giant magnetocaloric effect in Gd-5(Si2Ge2)[J].Physical review letters,1997(23):4494-4497. |
| [8] | Feng-xia Hu;Bao-gen Shen;Ji-rong Sun;Zhao-hua Cheng;Guang-hui Rao;Xi-xiang Zhang .Influence of negative lattice expansion and metamagnetic transition on magnetic entropy change in the compound LaFe_(11.4)Si_(1.6)[J].Applied physics letters,2001(23):3675-3677. |
| [9] | Tegus O;Bruck E;Buschow K H J et al.Transition-metal-based magnetic refrigerants for room-temperature applications[J].NATURE,2002,450(10):150. |
| [10] | Wada H.;Morikawa T.;Taniguchi K.;Shibata T.;Yamada Y.;Akishige Y. .Giant magnetocaloric effect of MnAs1-xSbx in the vicinity of first-order magnetic transition[J].Physica, B. Condensed Matter,2003(1/2):114-116. |
| [11] | 郭茂双 .Gd-Co-Al大块金属玻璃的非晶形成能力与磁热效应[D].成都:电子科技大学,2011. |
| [12] | 赵哲龙 .Gd-Al-TM 大块金属玻璃的形成、磁性和相变研究[D].上海:上海大学,2007. |
| [13] | Du J;Zheng Q;Li YB;Zhang Q;Li D;Zhang ZD .Large magnetocaloric effect and enhanced magnetic refrigeration in ternary Gd-based bulk metallic glasses[J].Journal of Applied Physics,2008(2):23918-1-23918-4-0. |
| [14] | Dong Q Y;Shen B G;Chen J et al.Large magnetic re-frigerant capacity in Gd71Fe3 Al26 and Gd65 Fe20 Al15 amor-phous alloys[J].Journal of Applied Physics,2009,105:053908-053901. |
| [15] | Xu Z Y;Hui X;Wang E R et al.Gd-Dy-Al-Co bulk me-tallic glasses with large magnetic entropy change and re-frigeration capacity[J].Journal of Alloys and Compounds,2010,504(01):S146. |
| [16] | Luo Q;Wang W H .Magnetocaloric effect in rare earth-based bulk metallic glasses[J].Journal of Alloys and Compounds,2010,495:209. |
| [17] | Zhong X C;Tang P F;Liu Z W et al.Magnetic proper-ties and large magnetocaloric effect in Gd-Ni amorphous ribbons for magnetic refrigeration applications in inter-mediate temperature range[J].Journal of Alloys and Compounds,2011,509:6889. |
| [18] | Zheng Z G;Zhong X C;Su K P et al.Magnetic proper-ties and large magnetocaloric effects in amorphous Gd-Al-Fe alloys for magnetic refrigeration[J].Science Chi-na-Phys Mech & Astron,2011,54(07):1267. |
| [19] | C. L. Zhang;D. H. Wang;Z. D. Han;H. C. Xuan;B. X. Gu;Y. W. Du .Large magnetic entropy changes in Gd-Co amorphous ribbons[J].Journal of Applied Physics,2009(1):013912-1-013912-4-0. |
| [20] | Zhang Q;Li B;Zhao X G et al.magnetic and reversible magnetocaloric properties of(Gd1-x Dyx)4 Co3 ferrimag-nets[J].Journal of Applied Physics,2009,105:053902-053901. |
| [21] | Zhong X C;Gao B B;Liu Z W et al.Amorphous and crystallized(Gd4 Co3)100-x Bx alloys for magnetic refrig-erants working in the vicinity of 200 K[J].Journal of Alloys and Compounds,2013,553:152. |
| [22] | Kouvel J S;Fisher M E .Detailed magnetic behavior of nickel near its Curie point[J].Physical Review,1964,136(6A):A1626. |
| [23] | Aharoni A.Introduction to the theory of ferromagnetism[M].New York:Oxford Science Publications,2000 |
| [24] | Morrish A H.The Physical Principles of Magnetism[M].Wiley-VCH:New York,1965 |
| [25] | F?ldeàki M;Chahine R;Bose T K .Magnetic measure-ments:a powerful tool in magnetic refrigerator design[J].Journal of Applied Physics,1995,77:3528. |
| [26] | Gschneidner K A Jr;Pecharsky V K;Pecharsky A O et al.Recent developments in magnetic refrigeration[J].Materials Science Forum,1999,3 15-3 17:69. |
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