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MgO粉末添加對NdBaCuO籽晶的影響
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國家“863”項目(2007AA03Z241)；國家自然科學基金重點項目(50432050)


Effects of MgO Powders Doping on NdBaCuO Seeds
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    摘要:

    頂部籽晶生長工藝是一種非常有效地制備REBaCuO大單疇超導塊材的方法。對于具有較高熔點的SmBaCuO體系，選擇合適的籽晶成為制備單疇樣品的關鍵因素之一。本實驗以NdBaCuO為基體，通過添加不同含量(0.2%，0.5%，1%，2%，5%，10%，質(zhì)量分數(shù))的MgO粉末，制備6種自發(fā)形核生長的多疇Nd-Ba-Cu-Mg-O塊材樣品，然后分別選用MgO含量為1%和10%的NdBaCuO為籽晶成功引導生長了近單疇的SmBaCuO塊材。利用DTA、XRD和OM技術分析不同MgO添加量對NdBaCuO前驅(qū)粉末熔化溫度的影響、MgO粉末在NdBaCuO基體中的飽和添加量以及Nd-Ba-Cu-Mg-O籽晶的特性。結果表明：在NdBaCuO中添加MgO粉末可以顯著提高基體的融化溫度；MgO粉末在NdBaCuO中的飽和添加量約為1%；在1%至10%的MgO添加范圍內(nèi)不會改變Nd-123的晶格類型

    Abstract:

    Top-seeded melt growth is an effective method to fabricate REBaCuO large single domain superconducting bulks. It is a key factor to choose a right seed for preparing single domain SmBaCuO bulks which has a higher melting point. Six kinds of polydomain Nd-Ba-Cu-Mg-O bulk samples doped with MgO powders of 0.2%, 0.5%, 1%, 2%, 5% and 10% (mass fraction) were prepared through spontaneous nucleation with NdBaCuO as the substrate, and then near single domain SmBaCuO bulks were successfully prepared using the NdBaCuO with 1% and 10% MgO as seeds. The effect of MgO doping content on the melting temperature of NdBaCuO precursor powders, the saturation doping content of MgO powders in NdBaCuO substrate and characteristics of Nd-Ba-Cu-Mg-O seeds were investigated by DTA, XRD and OM. Results show that MgO powder doped in NdBaCuO can significantly increase the melting temperature of NdBaCuO precursor powder. The saturation value of MgO powders doping in NdBCO is about 1%. MgO-doping between 1% and 10% does not change the basic crystal structure of Nd-123 phase

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徐曉燕,盧亞鋒,馮建情,張翠萍,熊曉梅,劉國慶,于澤銘. MgO粉末添加對NdBaCuO籽晶的影響[J].稀有金屬材料與工程,2010,39(10):1781~1784.[Xu Xiaoyan, Lu Yafeng, Feng Jianqing, Zhang Cuiping, Xiong Xiaomei, Liu Guoqing, Yu Zeming. Effects of MgO Powders Doping on NdBaCuO Seeds[J]. Rare Metal Materials and Engineering,2010,39(10):1781~1784.]
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  • 收稿日期:2009-10-17
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