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SPS制備Mn1.1Fe0.9P0.8Ge0.2Bx化合物磁熱性能的研究
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國家自然科學基金資助（51071007）；國家“973”項目(2010CB833100)


Magnetocaloric Properties in Mn1.1Fe0.9P0.8Ge0.2Bx Compounds Prepared by Spark Plasma Sintering
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    摘要:

    利用MA+SPS技術制備Mn1.1Fe0.9P0.8Ge0.2Bx（x=0，0.02，0.03，0.04）化合物并對其晶體結構和磁熱性能進行研究。XRD分析結果表明：該系列化合物具有六方Fe2P結構。隨著B含量的增加晶格常數(shù)a和c均發(fā)生了明顯的變化，導致c/a的值先減小后增大。分別利用DSC和VSM對材料的磁熱性能進行了測試，結果表明居里溫度TC和熵變均與B的含量存在一個非線性關系，當B的含量為0.02時Mn1.1Fe0.9P0.8Ge0.2B0.02化合物的磁熱性能最好，TC從x=0時的 253 K增加到263 K，相應的滯后從23 K下降到19 K，在0~2 T外磁場下的磁熵變從28.7 J/kg·K增加到32.6 J/kg·K

    Abstract:

    Mn1.1Fe0.9P0.8Ge0.2Bx (x=0, 0.02, 0.03, 0.04) compounds were prepared by mechanical milling and subsequent spark plasma sintering (SPS) technique. Their crystal structure was investigated by XRD and the magneticaloric properties were measured by DSC and VSM. Results show that Mn1.1Fe0.9P0.8Ge0.2Bx (x=0, 0.02, 0.03, 0.04) compounds possess a hexagonal Fe2P-type crystal structure. The lattice parameters a and c are changed noticeably with the increase of B, and c/a ratio decreases firstly and then increases. There is a nonlinear relationship between Curie temperature as well as the entropy change and the content of B. The compound achieves the best magneticaloric properties in this system when x=0.02. The Curie temperature increases from 253 K for x=0 to 263 K, and thermal hysteresis decreases from 23 K to 19 K. The maximum value of the magnetic entropy change increases from 28.7 to 32.6 J/kg·K for a field change from 0 to 2 T

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鄧曉軍,劉丹敏,岳 明,黃清鎮(zhèn),趙金良,張久興. SPS制備Mn1.1Fe0.9P0.8Ge0.2Bx化合物磁熱性能的研究[J].稀有金屬材料與工程,2013,42(7):1450~1453.[Deng Xiaojun, Liu Danming, Yue Ming, Huang Qingzhen, Zhao Jinliang, Zhang Jiuxing. Magnetocaloric Properties in Mn1.1Fe0.9P0.8Ge0.2Bx Compounds Prepared by Spark Plasma Sintering[J]. Rare Metal Materials and Engineering,2013,42(7):1450~1453.]
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  • 收稿日期:2012-07-14
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