[1]许志一,沈俊,沈保根.R PdAl（R=Gd Er）的磁性和磁热效应[J].中国材料进展,2013,(2):031-40.[doi:10.7502/j.issn.1674-3962.2013.02.03]
　XU Zhiyi,SHEN Jun,SHEN Baogen.Magnetic Properties and Magnetocaloric Effects in R PdAl (R=Gd Er)[J].MATERIALS CHINA,2013,(2):031-40.[doi:10.7502/j.issn.1674-3962.2013.02.03]
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R PdAl（R=Gd Er）的磁性和磁热效应()
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中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
期数:
2013年第2期
页码:
031-40
栏目:
特约研究论文
出版日期:
2013-03-31

文章信息/Info

Title:
Magnetic Properties and Magnetocaloric Effects in R PdAl (R=Gd Er)
作者:
许志一; 沈俊; 沈保根
（1．中国科学院物理研究所 磁学国家重点实验室，北京 100190）
（2．中国科学院理化技术研究所 低温重点实验室，北京 100190）
Author(s):
XU Zhiyi1;  SHEN Jun2;  SHEN Baogen1
(1. State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China)
(2. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy ofSciences, Beijing 100190, China)
关键词:
R PdAl化合物; 结构; 磁性; 磁熵变; 磁热效应
DOI:
10.7502/j.issn.1674-3962.2013.02.03
摘要:
低温退火的LTM R PdAl和高温退火的HTM R PdAl分别具有正交TiNiSi型和六角ZrNiAl型结构。综述了磁场和温度变化对LTM R PdAl和HTM R PdAl化合物磁性和磁热效应的影响。实验结果表明，LTM R PdAl化合物均是反铁磁性的，当R=Gd，Tb，Dy，Ho，Er时，奈尔温度T N分别为31，45，21，10和10 K。对于HTM R PdAl化合物，当R=Tb，Ho，Er时是反铁磁性的，T N分别为43，12和5 K，而当R=Gd，Dy时是铁磁性的，其居里温度分别为T C=49，25 K。反铁磁R PdAl化合物均呈现磁场诱导的反铁磁铁磁变磁转变。对HTM R PdAl（R=Ho，Er）化合物，由于弱的反铁磁耦合，在低磁场下呈现出高的饱和磁化强度，从而产生大的磁热效应，在0~5 T磁场变化下的最大磁熵变值和制冷能力分别高达206，24 3 J/kg·K和386，299 J/kg，是优异的低温磁制冷材料。
Abstract:
In this article, the investigation progress is reviewed in magnetic field and temperature dependences of the magnetic properties and magnetocaloric effects (MCEs) for RPdAl compounds with the orthorhombic TiNiSitype (LTM) and the hexagonal ZrNiAltype (HTM) structures. The LTMRPdAl (R=Gd, Tb, Dy, Ho and Er) compounds are found to be antiferromagnet with the Néel temperature TN=31, 45, 21, 10 and 10 K, respectively. It has been confirmed that the HTMRPdAl (R=Tb, Ho and Er) compounds undergo the antiferromagnetic (AFM)toparamagnetic (PM) transition at TN=43, 12 and 5 K, while the HTMRPdAl (R=Gd and Dy) compounds undergo the ferromagnetic (FM)toPM transition at their respective Curie temperature, which is TC =49 K and 25 K, respectively. A fieldinduced metamagnetic transition from AFM to FM state is observed below TN in the antiferromagnetic RPdAl. For the HTMRPdAl (R=Ho and Er) compounds, a small magnetic field can induce an FMlike state due to a weak AFM coupling, which leads to a high saturation magnetization, and gives rise to a large MCE around TN. The maximum value of magnetic entropy change (ΔSM) reaches -206 and -243 J/kg·K with a refrigerant capacity (RC) value of 386 and 299 J/kg around TN for a field change of 0~5 T, respectively. The large ΔSM and considerable RC suggest that HTMRPdAl may be an appropriate candidate for magnetic refrigerant in low temperature ranges.
更新日期/Last Update: 2013-01-31