通过电弧熔炼的方法制备了La(Fe1-xCox)13-ySiy(x=0.06,0.07；y=1.1,1.2)合金,将铸态合金进行了120 h的退火处理,退火温度1373 K.用XRD分析了合金的相组成,并用SEM、TEM分析了合金的微观组织结构.用超导量子干涉磁强计和磁热效应直接测量仪研究了合金的磁性能.结果表明,120 h热处理合金的主相为NaZn13型结构,呈岛状分布的少量α-Fe杂质相随着替代元素Co、Si含量的增加而减少,元素替代明显促进了合金在热处理过程中NaZn13型主相的生成.合金的居里温度Tc和绝热温差△Tab随替代元素的增加表现出规律变化.研究表明,通过改变替代元素含量可在退火时间少于一周的情况下得到具有较大制冷能力的室温磁致冷材料.
参考文献
| [1] | K. Mandal;O. Gutfleisch;A. Yan .Effect of reactive milling in hydrogen on the magnetic and magnetocaloric properties of LaFe_(11.57)Si_(1.43)[J].Journal of Magnetism and Magnetic Materials,2005(1):673-675. |
| [2] | Zou JD;Shen BG;Sun JR .Role of lattice contraction in the magnetocaloric effect in LaFe11.5Si1.5[J].Journal of Physics. Condensed Matter,2007(19):96220-1-96220-11-0. |
| [3] | Y. Zhu;K. Xie;X. Song .Magnetic phase transition and magnetic entropy change in melt-spun La_(1-x)Nd_xFe_(11.5)Si_(1.5) ribbons[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2005(1/2):20-23. |
| [4] | M. Balli;D. Fruchart;D. Gignoux;M. Rosca;S. Miraglia .Magnetic and magnetocaloric properties of La_(1-x)Er-xFe_(11.44)Si_(1.56) compounds[J].Journal of Magnetism and Magnetic Materials,2007(1):43-46. |
| [5] | 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. |
| [6] | Liu XB;Altounian Z;Tu GH .The structure and large magnetocaloric effect in rapidly quenched LaFe11.4Si1.6 compound[J].Journal of Physics. Condensed Matter,2004(45):8043-8051. |
| [7] | L. Jia;J. R. Sun;J. Shen;Q. Y. Dong;J. D. Zou;B. Gao;T. Y. Zhao;H. W. Zhang;F. X. Hu;B. G. Shen .Magnetocaloric effects in the La(Fe,Si)_(13) intermetallics doped by different elements[J].Journal of Applied Physics,2009(7):07A924-1-07A924-3-0. |
| [8] | S. Fujieda;A. Fujita;K. Fukamichi .Large magnetocaloric effect in La(Fe_(x)Si_(1-x))_(13) itinerant-electron metamagnetic compounds[J].Applied physics letters,2002(7):1276-1278. |
| [9] | Direct measurements of magnetocaloric effect in the first-order system LaFe_(11.7)Si_(1.3)[J].Journal of Applied Physics,2003(9):5503-5506. |
| [10] | ARIANA DE CAMPOS;DANIEL L ROCCO;ALEXANDRE MAGNUS G.CARVALHO .Ambient pressure colossal magnetocaloric effect tuned by composition in Mn_(1-x)Fe_xAs[J].Nature materials,2006(10):802-804. |
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