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Chin. Phys. B, 2010, Vol. 19(4): 047501    DOI: 10.1088/1674-1056/19/4/047501
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Effect of Dy substitution on magnetic properties and magnetocaloric effects of Tb6Co1.67Si3 compounds

Zhao Jin-Liang(赵金良)a)b)†, Shen Jun(沈俊)a)c), Li Yang-Xian(李养贤)a), Hu Feng-Xia(胡凤霞)b), Sun Ji-Rong(孙继荣)b), and Shen Bao-Gen(沈保根)b)
a School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China; b State Key Laboratory of Magnetism, Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; c Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Abstract  The magnetic and magnetocaloric properties of (Tb$_{1 - x}$Dy$_{x})_{6}$Co$_{1.67}$Si3 ($0 \le x \le 0.8$) have been experimentally investigated. The compounds exhibit a Ce$_{6}$Ni2Si3-type hexagonal structure and undergo a second-order magnetic transition. The Curie temperature decreases from $\sim 187$ K to 142 K as the content of Dy grows from 0 to 0.8. The maximal magnetic entropy change, for a field change of 0--5 T, varies between $\sim 6.2$ and $\sim 7.4$ J/kg$\cdot$K, slightly decreasing when Dy is introduced. The substitution of Dy leads to a remarkable increase in refrigeration capacity (RC). A large RC value of $\sim 626$ J/kg is achieved for $x=0.4$ under a field change of 0--5 T.
Keywords:  magnetic properties      magnetic entropy change      refrigerant capacity  
Received:  30 November 2009      Revised:  18 January 2010      Accepted manuscript online: 
PACS:  75.30.Sg (Magnetocaloric effect, magnetic cooling)  
  75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))  
  81.40.Rs (Electrical and magnetic properties related to treatment conditions)  
Fund: Project supported by the National Basic Research Program of China (Grant No.~2006CB601101), the National Natural Science Foundation of China (Grant Nos.~50731007 and 10874223) and the Knowledge Innovation Project of the Chinese Academy of Sciences.

Cite this article: 

Zhao Jin-Liang(赵金良), Shen Jun(沈俊), Li Yang-Xian(李养贤), Hu Feng-Xia(胡凤霞), Sun Ji-Rong(孙继荣), and Shen Bao-Gen(沈保根) Effect of Dy substitution on magnetic properties and magnetocaloric effects of Tb6Co1.67Si3 compounds 2010 Chin. Phys. B 19 047501

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