Development of metamagnetic-type large magnetocaloric materials used in high performance magnetic refrigeration for cryogenic thermometry

低温测温高性能磁制冷用变磁型大磁热材料的研制

• 批准号: 17360333
• 负责人: FUJITA Asaya
• 金额: $ 9.89万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360333/
• 关键词: Metal Physics; Magnetism; Efficient Usage of Energy; Magnetic Refrigeration; 環境材料; エネルギー効率化; 磁気熱量効果; 遍歴電子メタ磁性転移; 磁気体積効果

To obtain large magnetocaloric effects (MCEs) just above the Curie temperature Tc in La(Fe_xSi_<1-x>)_<L3> at low temperatures, it is necessary to control Tc to lower temperature regions. In (La_<1-z>R_z)(Fe_<0.88>Si_<0.12>)_<L3>(R=Ce), a lattice constant exhibit a remarkable shrinkage of about 1.5% and Tc is lowered to 173K. Variation of Tc was different between the partial substitutions of R=Ce and Pr, and it has been revealed that influence of hybridization among electrons in addition to the magnetovolume effect on Tc is important for the Ce-substituted compound s. Furthermore, a corresponding tendency that an increase (decrease) in 3d electron number results in the higher (lower) value of Tc has been observed in the partial substitution of Cr, Mn and Ni for Fe. From these results, the complex partial substitution in (La_<1-z>Ce_z)(Fe_<xy>Mn_ySi_<1-x-y>)_<13> has been carried out, resulting in variation of Tc from 0 to 180 K with maintaining the large MCEs by adjusting the concentration of Ce and Mn.In addition to these results, we have also investigated an influence of the energy barrier ΔE_b on the adiabatic temperature change. By examining the thermodynamic route in the adiabatic process, it has been revealed that the process is terminated when the energy barrier of 1kJ/kg can not be overcomed. Therefore, by taking the relation between ΔE_b and the hysteresis of metamagentic transition into account, we have investigated a control of the hysteresis loss and found a remarkable reduction of the loss by the partial substitution of Ce in the lower Fe concentration regions.We also confirmed that the thermal conductivity properties give no serious problem. Since these compounds are mainly composed of Fe which is cheap in the industrial market, and no constituent element is toxic, it is concluded that the present compound system is one of the promising candidates as new magnetic refrigerants working at low temperatures.

在La(Fe_xSi_t；1-x&gt；)_lt；L3&gt；中，为了获得略高于居里温度T_c的低温磁热效应，有必要将T_c控制在较低的温度区域。在(La_&lt；1-z&gt；R_z)(Fe_&lt；0.88&gt；Si_&lt；0.12&gt；)_&lt；L3&gt；(R=Ce)，中，晶格常数显着收缩约1.5%，T_c降至173K。在R=Ce和Pr的部分取代中，T_c的变化是不同的，这表明除了磁体积效应外，电子间的杂化效应对T_c的影响也是重要的.此外，在Cr，Mn和Ni部分取代Fe中也观察到了相应的趋势，即3d电子数的增加(减少)导致T_c值的升高(降低).根据这些结果，在(La_&lt；1-z&gt；Ce_z)(Fe_&lt；xy&gt；Mn_ySi_&lt；1-x-y&gt；)_&lt；13&gt；中进行了络合部分取代，使T_c从0到180K变化，同时通过调节Ce和Mn的浓度来保持较大的MCEs。此外，我们还研究了势垒ΔE_b对绝热温度变化的影响。通过对绝热过程热力学路径的考察，发现当1kJ/kg的能垒不能被克服时，绝热过程就终止了。因此，通过考虑ΔE_b与变晶转变滞后的关系，我们研究了控制磁滞损耗的方法，发现在较低的Fe浓度区域，Ce的部分替代可以显著降低损耗。我们还证实了热导性能不存在严重的问题。由于这些化合物主要由工业市场上价格低廉的铁组成，并且没有任何组成元素是有毒的，因此认为该化合物体系是一种很有前途的低温工作的新型磁制冷剂。

项目成果

Enhancement of Magnetocaloric Effects in Single Phase La_<l-z>Nd_z(Fe_<0.88>Si_<0.12>)_<13>

单相La_<l-z>Nd_z(Fe_<0.88>Si_<0.12>)_<13>磁热效应的增强

• 发表时间: 2007
• 期刊: Advanced Materials Research 26-28
• 作者: Xiuli;Ma;et. al;藤田麻哉;藤枝俊;藤田麻哉;藤枝 俊;藤枝 俊
• 通讯作者: 藤枝 俊

Relative Cooling Power of La(Fe_xSi_<1-x>)_<13> after Controlling of the Curie Temperature by Hydrogenation and Partial Substitution of Ce

加氢和部分取代Ce控制居里温度后La(Fe_xSi_<1-x>)_<13>的相对冷却能力

• 发表时间: 2007
• 期刊: J. Magn. Magn. Mater 310
• 作者: Xiuli;Ma;et. al;藤田麻哉;藤枝俊;藤田麻哉;藤枝 俊;藤枝 俊;A. Fujita
• 通讯作者: A. Fujita

Control of working temperature range of large isothermal magnetic entropy change in La(Fe_xTM_ySi_<1-x-y>)_<13> (TM=Cr, Mn, Ni) and La_<1-z>Ce_z(Fe_xMn_ySi_<1-x-y>)_<13>

La(Fe_xTM_ySi_<1-x-y>)_<13>(TM=Cr,Mn,Ni)和La_<1-z>Ce_z(Fe_xMn_ySi_<1-x-y>)大等温磁熵变工作温度范围的控制

• 发表时间: 2006
• 期刊: Mater.Trans. (印刷中)
• 作者: Xiuli;Ma;et. al;藤田麻哉;藤枝俊;藤田麻哉;藤枝 俊;藤枝 俊;A. Fujita;S. Fujieda;A. Fujita;S. Fujieda;藤枝 俊;藤枝 俊;藤枝 俊;藤田麻哉;藤田麻哉;藤田麻哉;藤田麻哉;深道和明;藤枝 俊;S. Fujieda;S. Fujieda;藤枝 俊
• 通讯作者: 藤枝 俊

Control of Large Magnetocaloric Effects in La_<1-zPr_z(Fe_xSi_<1-x>)_<13>>H_y Magnetic Refrigerants Working around Room Temperature

室温下La_<1-zPr_z(Fe_xSi_<1-x>)_<13>>H_y磁制冷剂大磁热效应的控制

• 发表时间: 2005
• 期刊: Proc. the 1^<st> Int. Conf. on Magnetic Refrigeration at Room Temperature Vol. 1
• 作者: Xiuli;Ma;et. al;藤田麻哉;藤枝俊;藤田麻哉;藤枝 俊;藤枝 俊;A. Fujita;S. Fujieda;A. Fujita;S. Fujieda;藤枝 俊;藤枝 俊;藤枝 俊;藤田麻哉;藤田麻哉;藤田麻哉;藤田麻哉;深道和明;藤枝 俊;S. Fujieda;S. Fujieda;藤枝 俊;藤田麻哉;S. Fujieda
• 通讯作者: S. Fujieda

Influence of Phase-Transition Barrier on Adiabatic Temperature Change in Itinerant-Electron Metamagnetic La(Fe_<x>Si_<1-x>)_13 Compounds (in Japanese)

相变势垒对流动电子变磁La(Fe_<x>Si_<1-x>)_13化合物绝热温度变化的影响（日文）

• 发表时间: 2007
• 作者: Xiuli;Ma;et. al;藤田麻哉;藤枝俊;藤田麻哉;藤枝 俊;藤枝 俊;A. Fujita;S. Fujieda;A. Fujita;S. Fujieda;藤枝 俊;藤枝 俊;藤枝 俊;藤田麻哉;藤田麻哉;藤田麻哉;藤田麻哉;深道和明;藤枝 俊;S. Fujieda;S. Fujieda;藤枝 俊;藤田麻哉;S. Fujieda;藤田 麻哉;A. Fujita;藤田麻哉;A. Fujita;藤枝 俊;藤枝 俊;S. Fujieda;S. Fujieda;藤田 麻哉;藤田麻哉;藤枝 俊;A. Fujita;S. Fujieda;藤田麻哉;藤枝 俊;A. Fujita;S. Fujieda;藤田麻哉;藤枝 俊;A. Fujita
• 通讯作者: A. Fujita