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(GdxDy1-x) 12Co7 Magneto-thermal Eff ect

Yunyue Du, Shujuan Bi, Shaoyong Cai

Abstract


Because of its own advantages such as energy saving and environmental protection, the greenhouse magnetic refrigeration technology is attracting more and more attention. Magnetic refrigeration materials as one of the key technology, its development has a very important role. This paper begins with a brief overview of the basic principles of magnetic refrigeration and the development of magnetic refrigeration materials. In this paper, the phase structure and Magnetocaloric eff ect of (GdxDy1-x) 12Co7 (x = 0.3, 0.5, 0.7, 0.8) series alloys were investigated by X-ray diff raction and magnetic properties measurements. The results show that all samples are monoclinic crystals, with the Gd composition increases, the Curie temperature of the alloy from 92K to 142K linear increase. In the case of an external magnetic fi eld of 2Td, the maximum magnetic entropy of the (GdxDy1-x) 12Co7 (x = 0.3, 0.5, 0.7, 0.8) series alloy becomes 6.93 J / kg · K. By analyzing the XRD patterns of the alloys and the graphs of the M-H and Arrott graphs, it is shown that the alloy is transformed from a secondary phase transition to a primary phase transition.

Keywords


(GdxDy1-x) 12Co7 system; Magnetic entropy change; Magnetocaloric eff ect

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References


Zhong Xichun, Zeng Dechang, Liu Zhengyi, Wei Xingzhao. Materials Science and Engineering .2002, 20: 441

Chen Guoban, et al. The latest low-temperature refrigeration technology. Beijing: Machinery Industry Press .1994,53 - 57

P. Debye. Einige Be merkunge zur Magnetisierung bei tiefer temperature. Ann phys. 1926, 81, 1154-1160

Liu Aigong. The physical principle of entropy and adiabatic demagnetization. Physics and Engineering. 2001, Vo1.11.No.2

W.F. Giauque, D.P. McDougall. Attainment of temperatures below 1? Absolute by the Magnetization of Gd2 (S04) 3? H20.

Phys Rev. 1933, 43: 768

Li Zhuotang, et al. Magnetic properties of rare earth materials and their applications. Chemical progress .1995,7 (2): 140 - 150

E. Warburg, Ann.d. Physik. The distribution of the heat emission in the magnetic hysteresis cycle. Ann. Phys. 1881, 13, 141-

Yan Chunhua. Commonly used refrigerant and green refrigeration. Beijing Science and Technology of the window .2004.11

P.Weiss, A.Piccsrd. Sur un nouveau Phenomen magetocalorique et lachaleur specifi que. Compt Rend. 1918, 166, 325-335

ang Bin, Yang Junyi, Zhu Gensong. Research status and development prospect of room temperature magnetic refrigeration

materials. Rare Earth. 2004.08.

W.F. Giauque. A hermodynamic treatment of certain magnetic eff ects. A proposed method of producing temperature below 1?

Absolute. J Amer Chem Soc. 1927, 49, 1864 - 1869

P. J. Hakonen, S. Yin, O.V. Lounasmaa. Nuclear magnetism in silver in at Positive and Negative Absolute Temperatures in the

Low Nanolelvin Range. Phys Rev Lett. 1990, 64, 2707 - 2713

Chen Limin. New room temperature magnetic refrigeration materials. Beijing University of Technology .2002,05

Long Yi et al. Science Bulletin .1993,38: 1944

Niu X. J., Gschneidner Jr. K. A., Pechasky A. O. and Pechasky V K., J. Magn. Main Mater. 2001, 234: 193

DaiW., Shen B.G, LiD.X., GaoZ.X. J. Alloys Comp. 2000, 31: 122

Shao Yuanzhi, et al. Journal of Sun Yat-sen University (Natural Science Edition). 1994,33: 103

Wand D.H., Liu H.D., Tang S.L., YangS., Huang S.L. and Du YW. Physics Letters A 2002, 297: 247

Duc N. H., Kim Anh D. T., Brommer P. E. Physica B 2002,319: 1




DOI: https://doi.org/10.18282/ip.v1i1.140

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