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  • 非晶磁性材料的設計 - 下載本文

    大連海事大學

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    業 論

    二○一○ 年 六 月

    畢文

    非晶磁性材料的設計

    專業班級:應用物理學

    姓 名:林敏

    指導老師:陳季香

    06級(1)班

    物理系

    2

    內容摘要

    磁性材料在日常生活和工業上都有不可替代的作用,尤其是非晶磁性材料由于其優越的特點而倍受青睞,其中Fe-Nd-B已經制備出比較好的非晶磁性材料。本文的主要內容是驗證團簇判據原理的合理性,并給預測新的Fe-Nd-B非晶磁性材料指明方向。本文的主要內容和得到的結果如下:

    團簇線判據,以前亦稱“變電子濃度線判據”,是指在三元相圖上二元特殊團簇與第三組元的成分連線。它反映了優化的三元非晶相與基礎二元團簇之間的結構聯系,可視為從二元團簇向三元相的生長路徑。其實團簇線判據可以被認為是團簇結構添加連接原子組成新的成分,即團簇不一定是二元的,也可以是三元的,也就是說,不僅要分析二元相Fe-Nd,Fe-B的團簇,而且也要分析Fe-Nd-B的團簇。

    要得到塊體的非晶體,三種元素需要有一定的比例,已知的非晶磁性材料包括Nd15Fe77B8,本文證明此非晶磁性材料成分符合團簇線判據,也就是說團簇線判據原理是合理的。

    通過carine軟件畫出Fe-Nd,Fe-B,Fe-Nd-B相的團簇結構,篩選出比較好的團簇結構,本文選擇好的團簇結構是根據密堆度的大小和團簇結構的分析來判斷的,其中BFe9,Fe11Nd2,這兩種團簇添加連接原子可分別形成與Nd15Fe77B8很接近的成分BFe9Nd2和BFe11Nd2,這證明了團簇線判據理論的合理性。

    但是經過分析好的團簇不僅只有BFe9和Fe11Nd2,我們還找出Fe7Nd6,Nd3Fe18,Fe9Nd4,B3Fe8四種比較好的團簇,可以嘗試通過添加一個,兩個,三個Nd原子或者B原子來組成新的成分,為后期工作者提供尋找Fe-Nd-B非晶磁性材料的方向和數據。

    關鍵詞:非晶磁性材料;團簇模型;團簇模型的選取;團簇線判據

    ABSTRACT

    Megnetic materials can not be substituted not only in our daily life, but also in industry. Especially amorphous megnetic materials such as Fe-Nd-B amorphous megnetic materials are very popular because of their superior features.this paper is to validate whether the cluster line criterion is proper and point out the oriention of finding the new Fe-Nd-B amorphous megnetic materials.

    The cluster line criterion, which is also called “e/a-variant criterion”, refers to a specific composition line linking a specific cluster composition to the third. elementwhich reflects the structure relationship between the optimized ternary amorphous alloy and the basic binary cluster. It can be regarded as the growth pathway from the binary cluster to a ternary phase.In fact, the cluster line criterion can be regarded as adding clusters with joint atoms to form new composition, that’s to say, cluster can not only to be binary , but also ternary, so we should analyse binary phase Fe-Nd, Fe-B, but also ternary phase Fe-Nd-B.

    To get bulk amorphous body, the three kinds of element should be in proper proportion. we have known that Nd15Fe77B8 is a kind of good amorphous megnetic material.this paper will testify that Nd15Fe77B8 give agreement with the cluster line criterion,saying that the cluster line criterion is resonable.

    We picture the cluster structure of the phases of Fe-Nd, Fe-B, and Fe-Nd-B by Carine. we select better clusters accroding to packing consideration and cluster structure .among the good clusters, BFe9,and Fe11Nd2 can match the well-known composition by add joint atoms, this can prove that the cluster line criterion is resonable.

    However, through analysing, besides BFe9 and Fe11Nd2 ,we also find good clusters, Fe7Nd6, Nd3Fe18, Fe9Nd4,and B3Fe8.we can try to add one, two, or three Nd atoms or B atoms to compose new composition, thus providing orientation and datas to find new Fe-Nd-B amorphous megnetic materials for later researchers.

    Key words: amorphous megnetic materials;clusters modes;selection of clusters;the cluser line criterion.

    目 錄

    1 引言 ............................................................................................................................. 1

    1.1 磁性研究簡史 ..................................................................................................... 1 1.2 非晶磁性材料的應用 ........................................................................................... 2

    1.2.1 在電力配電變壓器中的應用 ....................................................................... 2 1.2.2 在中小型工頻領域中的應用 ....................................................................... 2 1.2.3 在中頻頻域中的應用 ................................................................................. 2 1.3 非晶合金磁性材料Fe-Nd-B ................................................................................. 3

    1.3.1 非晶合金磁性材料Fe-Nd-B的特點 ............................................................ 3 1.3.2 Fe-Nd-B的應用前景 ................................................................................... 3 1.4 非晶合金的發展進程 ........................................................................................... 3

    1.4.1 早期非晶合金發展史 ................................................................................. 3 1.4.2 大塊狀非晶合金的研究進展 ....................................................................... 4 1.5 本論文的研究內容 .............................................................................................. 6 1.6 研究的目的和意義 .............................................................................................. 6 2 非晶磁性材料的結構研究 ............................................................................................. 7

    2.1 非晶態結構的描述方法 ....................................................................................... 7

    2.1.1 徑向分布函數RDF[45] ................................................................................ 7

    2.1.2 短程序參數 ............................................................................................... 7 2.2 團簇結構模型 ..................................................................................................... 8 2.3 塊體非晶合金成分設計思想 ................................................................................ 9 2.4 團簇結構模型的選取 ......................................................................................... 10 3 Fe-Nd-B團簇的選取 .................................................................................................... 12

    3.1 已知的Fe-Nd-B的非晶結構成分 ....................................................................... 12

    3.2 利用CaRIne Crystal 軟件畫出Fe-Nd-B相的團簇結構 ........................................ 12 3.3 介紹比較好的團簇結構 ..................................................................................... 21 3.4 分析Fe-Nd-B相的團簇結構 .............................................................................. 22

    3.4.1 團簇結構分析 .......................................................................................... 22 3.4.2 如何添加元素形成Ndl5Fe77B8................................................................... 22 3.4.3 預言新的成分 .......................................................................................... 22

    4 結論與展望................................................................................................................. 23 參 考 文 獻 .................................................................................................................. 24 致謝............................................................................................................................... 31





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