LaFe11.5Si1.5化合物氢化特性及稳定性的研究

张登魁; 赵金良; 张红国; 岳明

doi:10.7498/aps.63.197501

摘要

系统研究了温度、时间、压力等因素对LaFe11.5Si1.5化合物吸氢过程的影响以及效果. 结果表明：吸氢处理会增大化合物的晶格常数，但不会改变其晶体结构. 在温度为423 K，氢气压力为0.0987 MPa时，可以制备出氢分布均匀的LaFe11.5Si1.5H1.6间隙化合物. 氢化处理可以明显提高化合物的居里温度，降低热滞后，并且使磁熵变保持在较高值. LaFe11.5Si1.5H1.6样品随着在空气中暴露时间的延长，居里温度和磁熵值的变化非常小，氢化合金的磁热性能具有良好的时间稳定性.

关键词:

Abstract

We have studied systematically the effects of temperature, time, and pressure on the process of hydrogen absorption in LaFe11.5Si1.5 compound. Results show that hydrogen absorption can increase the lattice parameter of the compound without changing its crystal structure. The LaFe11.5Si1.5H1.6 compound can be prepared at a hydrogen pressure of 0.0987 MPa at 423 K with uniform distribution of hydrogen. Hydrogen absorption can also increase the Curie temperature obviously, decrease the thermal hysteresis and maintain the magnetic entropy change at a high standard. With prolonged exposure time in air, the variation of the Curie temperature and magnetic entropy change of LaFe11.5Si1.5H1.6 compound are very small, implying that the magnetic thermal performance of hydride alloy has a good time stability.

Keywords:

作者及机构信息

1.
北京工业大学材料科学与工程学院, 北京 100124;

2.
北京工业大学应用数理学院, 北京 100124

基金项目: 国家自然科学基金青年科学基金（批准号：51301008）和国家自然科学基金（批准号：51071007，51171003）资助的课题.

Authors and contacts

1.
College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;

2.
College of Applied Sciences, Beijing University of Technology, Beijing 100124, China

Funds: Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 51301008), and the National Natural Science Foundation of China (Grant Nos. 51071007, 51171003).

参考文献

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[22]	Zhao J L, Shen J, Hu F X, Li Y X, Sun J R, Shen B G 2010 J. Appl. Phys. 107 113911
[23]	Chen Y F, Wang F, Shen B G, Hu F X, Cheng Z H, Wang G J, Sun J R 2002 Chin. Phys. 11 741
[24]	Fu B, Long Y, Shi P J, Ma T, Bao B, Yan A R, Chen R J 2009 Chin. Phys. B 18 4506
[25]	Zhao J L 2010 Ph. D. Dissertation (Tianjin: Hebei University of Technology) (in Chinese) [赵金良2010博士学位论文(天津: 河北工业大学)]
[26]	Zhao J L, Shen J, Shen B G, Hu F X, Sun J R 2010 Solid State Commun. 150 2330

施引文献

[1]	Warburg E, Untersuchungen M, Magnetische Untersuchungen 1881 Ann. Phys. 13 141
[2]	Zhao X, Chen W, Li A J, Ma L M, Zong Y 2009 Chin. Phys. Lett. 26 87401
[3]	Hui X D, Xu Z Y, Wang E R, Chen G L, Lu Z P 2010 Chin. Phys. Lett. 27 117502
[4]	Zhang G Y, Chen H, Yang D, Hu F, Liu H S 2012 Chin. Phys. Lett. 29 27502
[5]	Wang F, Yuan F Y, Wang J Z 2013 Acta. Phys. Sin. 62 167501[王芳, 原凤英, 汪金芝 2013 物理学报 62 167501]
[6]	Hu F X, Shen B G, Sun J R 2013 Chin. Phys. B 22 037505
[7]	Shen B G, Sun J R, Hu F X, Zhang H W, Cheng Z H 2009 Adv. Mater. 21 4545
[8]	Shen J, Li Y X, Wang F, Wang G J, Zhang S Y 2004 Chin. Phys. 13 1134
[9]	Wang F, Chen Y F, Wang G J, Sun J R, Shen B G 2004 Chin. Phys. 13 1344
[10]	Shen J, Gao B, Yan L Q, Li Y X, Zhang H W, Hu F X, Sun J R 2007 Chin. Phys. 16 3848
[11]	Wang F, Wang G J, Sun J R, Shen B G 2008 Chin. Phys. B 17 3087
[12]	Shen B G, Hu F X, Dong Q Y, Sun J R 2013 Chin. Phys. B 18 017502
[13]	Tishin A M 1999 Handbook of Magnetic Materials (Vol. 12) (Amsterdam: Elsevier) pp395–524
[14]	Gschneidner K A, Pecharsky V K, Tsokol A O 2005 Rep. Prog. Phys. 68 1479
[15]	Hu F X, Qian X L, Sun J R, Wang G J, Zhang X X, Cheng Z H, Shen B G 2002 J. Appl. Phys. 92 3620
[16]	Balli M, Fruchart D, Gignoux D 2007 J. Phys.: Condens. Matter 19 236230
[17]	Shen J, Li Y X, Zhang J, Gao B, Hu F X, Zhang H W, Chen Y Z, Rong C B, Sun J R 2008 J. Appl. Phys. 103 07B317
[18]	Yan A, Mller K H, Gutfleisch O 2008 J. Alloys Compd. 450 18
[19]	Liu G J, Sun J R, Shen J, Gao B, Zhang H W, Hu F X, Shen B G 2007 Appl. Phys. Lett. 90 032507
[20]	Wang F, Chen Y F, Wang G J, Sun J R, Shen B G 2004 Chin. Phys. 13 393
[21]	Chen J, Zhang H W, Zhang L G, Dong Q Y, Wang R W 2006 Chin. Phys. 15 845
[22]	Zhao J L, Shen J, Hu F X, Li Y X, Sun J R, Shen B G 2010 J. Appl. Phys. 107 113911
[23]	Chen Y F, Wang F, Shen B G, Hu F X, Cheng Z H, Wang G J, Sun J R 2002 Chin. Phys. 11 741
[24]	Fu B, Long Y, Shi P J, Ma T, Bao B, Yan A R, Chen R J 2009 Chin. Phys. B 18 4506
[25]	Zhao J L 2010 Ph. D. Dissertation (Tianjin: Hebei University of Technology) (in Chinese) [赵金良2010博士学位论文(天津: 河北工业大学)]
[26]	Zhao J L, Shen J, Shen B G, Hu F X, Sun J R 2010 Solid State Commun. 150 2330

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