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球磨制備的La(Fe1-xCox)11.2Si1.8化合物的相形成和磁熱效應(yīng)
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內(nèi)蒙古大學(xué)

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國(guó)家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目，重點(diǎn)項(xiàng)目，重大項(xiàng)目）NSFC(51161017)


Phase Formation and Magnetocaloric Effect in La(Fe1-xCox)11.2Si1.8 Compounds Prepared by Ball-milling
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Inner Mongolia University

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    摘要:

    將LaSi母合金和元素粉末混合，利用球磨工藝制備了La(Fe1-xCox)11.2Si1.8 (x = 0, 0.02, 0.04, 0.06)樣品。在1423K的溫度下燒結(jié)30分鐘，然后放入水中快速冷卻，就可以獲得幾乎為NaZn13型結(jié)構(gòu)的單相化合物。磁性質(zhì)的研究表明，樣品的居里溫度隨著Co含量從x=0到x=0.06而提高，但是磁熵變減小。在0-1.5T的外加磁場(chǎng)下，LaFe11.2Si1.8合金在其居里溫度附近的最大磁熵變達(dá)到的6.5 J/kg，而x=0.06的樣品的最大磁熵變約為2.1 J/kg K。另外，球磨制備的樣品還呈現(xiàn)了二級(jí)磁相變的特點(diǎn)，這對(duì)于磁熱效應(yīng)的應(yīng)用非常有意義。

    Abstract:

    The samples of La(Fe1-xCox)11.2Si1.8 (x = 0, 0.02, 0.04, 0.06) have been prepared by ball-milling with elemental powder and LaSi cast master alloys. After sintering at 1423 K for 30 minutes followed by a quenching in water, an almost NaZn13 type single phase has been obtained. The study of magnetic properties revealed that the Curie temperature increases with Co content from x=0 to 0.06 whereas the magnetic entropy change decreases. The alloy of LaFe11.2Si1.8 has a maximum magnetic entropy change △Sm of 6.5 J/kg K near its Curie temperature under a magnetic field of 0-1.5T, while the maximum magnetic entropy change is about 2.1 J/kg K with x=0.06. Furthermore, the magnetization of ball-milled samples exhibits a second-order magnetic transition, which is interesting for magnetocaloric applications.

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王利剛.球磨制備的La(Fe1-xCox)11.2Si1.8化合物的相形成和磁熱效應(yīng)[J].稀有金屬材料與工程,2016,45(11):2814~2817.[wangligang. Phase Formation and Magnetocaloric Effect in La(Fe1-xCox)11.2Si1.8 Compounds Prepared by Ball-milling[J]. Rare Metal Materials and Engineering,2016,45(11):2814~2817.]
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  • 收稿日期:2014-07-28
  • 最后修改日期:2015-01-12
  • 錄用日期:2015-02-06
  • 在線發(fā)布日期: 2016-12-08
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