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Sm2Fe17Nx的結(jié)構(gòu)精修分析
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教育部新教師博士點(diǎn)基金(200806101020);國(guó)家自然科學(xué)基金(50904046)


Crystal Parameters of Sm2Fe17Nx Analysis by Rietveled Method
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    摘要:

    通過(guò)XRD分析并結(jié)合Rietveled結(jié)構(gòu)精修方法研究Sm2Fe17合金的氮化后粉末的物相組成與含量,單胞的精細(xì)結(jié)構(gòu)。結(jié)果表明:氮原子優(yōu)先進(jìn)入9e晶位,氮原子的引入導(dǎo)致了SmFeN晶胞的不對(duì)稱畸變,致使稀土Sm的6c和3a晶位以及Fe原子的9d晶位占位過(guò)飽和,而Fe原子的6c,18f,18h晶位出現(xiàn)了少量缺位情況;在490 ℃,0.3 MPa氮壓力下氮化4 h后,氮原子在9e晶位占位率達(dá)99.4%,獲得主相的含量達(dá)97.9%(質(zhì)量分?jǐn)?shù),下同),Sm2O3相為0.9%,SmN相為0.5%,α-Fe相為0.7%的高純高氮含量的SmFeN合金粉末。

    Abstract:

    The crystal parameters and phase composition of Sm2Fe17Nx powders were investigated by means of XRD (X-ray Diffraction Test) and Rietveled method. The results show that the nitrogen atoms preferentially enter 9e crystal sites, and the introduction of them leads to the asymmetric distortion of SmFeN unit cell, resulting in that the occupancy of 6c and 3a sites for rare-earth Sm and 9d sites for Fe atoms are super-saturation, while the 6c, 18f and 18h sites for Fe atoms are possessed incompletely. After heated at 490 oC for 4 h under 0.3 MPa N2 atmosphere, the occupancy factor of nitrogen atoms in the 9e sites is 99.4% and the high-purity and high-nitrogen-content SmFeN powder with 97.9wt% main phase, 0.9wt% Sm2O3 phase, 0.5wt% SmN phase and 0.7wt% α-Fe phase are obtained.

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葉金文,劉 穎,鄭華雄,陳先富,廖 立. Sm2Fe17Nx的結(jié)構(gòu)精修分析[J].稀有金屬材料與工程,2011,40(6):1015~1018.[Ye Jinwen, Liu Ying, Zheng Huaxiong, Chen Xianfu, Liao Li. Crystal Parameters of Sm2Fe17Nx Analysis by Rietveled Method[J]. Rare Metal Materials and Engineering,2011,40(6):1015~1018.]
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  • 收稿日期:2010-06-20
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