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The crystal field (CF)- and external magnetic field- split ground state of Dy3+ in Dy3Al5O12 (DyAG) has been calculated based on the quantum theory in this paper. The eight CF-split levels are obtained, which are all twofold degenerates and are removed by the external magnetic field. On the basis of the results, the magnetic moments and the magnetic entropy changes of DyAG are calculated in the temperature range of 3THe3Ga5O12(GdGG) is stronger at low temperatures and dependent on the temperature and external magnetic field. Besides, the variation of the adiabatic temperature change ΔT with T is theoretically anticipated and the anticipated results are comparied with that of GdGG. It is found that the maximum adiabatic temperature change ΔT of DyAG is 1.27 times larger than that of GdGG when T=11 K and He=1 T. However, it changes to 1.15 times that of GdGG when T=16 K and He=2 T. There are differences between the refrigerative properties of DyAG and GdGG when they are in different external magnetic fields and different temperature regions. At low temperature s(THe is higher, GdGG is a good selection. This study is helpful to select suitable materials for the magnetic refrigeration technology.
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Keywords:
- Dy3Al5O12 /
- magnetic moment /
- magnetic entropy changes /
- Gd3Ga5O12
[1] Moya X, Hueso L E, Maccherozzi F, Tovstolytkin A I, Podyalovskii D I, Ducati C, Phillips L C, Ghidini M, Hovorka O, Berger A, Vickers M E, Defay E, Dhesi S S, Mathur N D 2013 Nature Mater 12 52
[2] Liu J, Gottschall T, Skokov K P, Moore J D, Gutfleisch O 2012 Nature Mater 11 620
[3] Sun G F, Qiang W J 2008 Magnetic function materials (Beijing: Chemical industry press) p285 (in Chinese) [孙光飞, 强文江 2008 磁功能材料 (北京: 化学工业出版社) 第285页]
[4] Li R, Numazawa T, Huahimoto T 1986 Advancesin Cryogenic Engineering Materials 32 287
[5] Hu F, Zhang G Y, Huang Y J, Xia W S 2014 Chin. Phys. Lett. 31 057501
[6] Zhang G Y, Chen H, Yang D, Hu F, Liu H S 2012 Chin. Phys. Lett. 29 027502
[7] Chen H, Zhang G Y, Yang D, Gao J 2012 Acta Phys. Sin. 61 097501 (in Chinese) [陈辉, 张国营, 杨丹, 高娇 2012 61 097501]
[8] Huang Y J, Zhang G Y, Hu F, Xia W S, Liu H S 2014 Acta Phys. Sin. 63 227501 (in Chinese) [黄逸佳, 张国营, 胡风, 夏往所, 刘海顺 2014 63 227501]
[9] Hu F, Zhang G Y, Yang D, Zhang X L, Xue L P, Zhang L 2013 Chin. Phys. Lett. 30 087803
[10] Yang G, Zhang G Y, Gao J, Xue L P, Xia T, Zhang X L 2011 Chin. Phys. B 20 017802
[11] Kolmakova N P, Levitin R Z, Popov A I 1990 Phys. Rev. B 41 6170
[12] Masato E, Lzuru U, Yoshiya A, Lu Q F, Kiyoo S 1998 Material Transactions 39 1220
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[1] Moya X, Hueso L E, Maccherozzi F, Tovstolytkin A I, Podyalovskii D I, Ducati C, Phillips L C, Ghidini M, Hovorka O, Berger A, Vickers M E, Defay E, Dhesi S S, Mathur N D 2013 Nature Mater 12 52
[2] Liu J, Gottschall T, Skokov K P, Moore J D, Gutfleisch O 2012 Nature Mater 11 620
[3] Sun G F, Qiang W J 2008 Magnetic function materials (Beijing: Chemical industry press) p285 (in Chinese) [孙光飞, 强文江 2008 磁功能材料 (北京: 化学工业出版社) 第285页]
[4] Li R, Numazawa T, Huahimoto T 1986 Advancesin Cryogenic Engineering Materials 32 287
[5] Hu F, Zhang G Y, Huang Y J, Xia W S 2014 Chin. Phys. Lett. 31 057501
[6] Zhang G Y, Chen H, Yang D, Hu F, Liu H S 2012 Chin. Phys. Lett. 29 027502
[7] Chen H, Zhang G Y, Yang D, Gao J 2012 Acta Phys. Sin. 61 097501 (in Chinese) [陈辉, 张国营, 杨丹, 高娇 2012 61 097501]
[8] Huang Y J, Zhang G Y, Hu F, Xia W S, Liu H S 2014 Acta Phys. Sin. 63 227501 (in Chinese) [黄逸佳, 张国营, 胡风, 夏往所, 刘海顺 2014 63 227501]
[9] Hu F, Zhang G Y, Yang D, Zhang X L, Xue L P, Zhang L 2013 Chin. Phys. Lett. 30 087803
[10] Yang G, Zhang G Y, Gao J, Xue L P, Xia T, Zhang X L 2011 Chin. Phys. B 20 017802
[11] Kolmakova N P, Levitin R Z, Popov A I 1990 Phys. Rev. B 41 6170
[12] Masato E, Lzuru U, Yoshiya A, Lu Q F, Kiyoo S 1998 Material Transactions 39 1220
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