Synthesis of Nd2Fe14C compound by high-energy ball-milling Nd–Fe alloy in heptane and annealing under vacuum
Synthesis of Nd2Fe14C compound by high-energy ball-milling Nd–Fe alloy in heptane and annealing under vacuum
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DOI：
10.1088/0022-3727/49/21/215001
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发表时间：
2016-05
期刊：
影响因子：
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通讯作者：
H. Geng;Y. Ji;X. Feng;J. Zhang;Z. Ran;Y. Yan;W. Wang;F. Su;X. Du
中科院分区：
文献类型：
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作者：
H. Geng;Y. Ji;X. Feng;J. Zhang;Z. Ran;Y. Yan;W. Wang;F. Su;X. Du
本文提出了一种简单的合成方法，合成了具有良好永磁性能的Nd_2Fe_（14）C化合物。NdFe 3.5合金在庚烷（C7 H16）中高能球磨8h后，由Nd 2Fe 17和Nd相组成，发生NdH 2 +δ和α-Fe相的转变。随后，当在真空下从室温退火至900 °C时，NdH 2 +δ分解，并且释放出H2。最终产物中有Nd_2Fe_（14）C、NdC和少量α-Fe相生成。H和C原子来自庚烷的分解。矫顽力为1.39 T，最大磁能积为62.7 kJ m−3。球磨时间过短会导致NdFe 3.5合金晶化不充分，最终产物中有Nd 2Fe 17相残留。球磨时间过长，除Nd 2Fe 14 C和NdC相外，还出现了NdC 2和更多的α-Fe相。已证明己烷（C6 H14）、辛烷（C8 H18）和壬烷（C9 H20）具有与庚烷类似的效果。
A simple synthesis route for the Nd2Fe14C compound with good permanent magnetic properties is presented. Being high-energy ball-milled in heptane (C7H16) for 8 h, the NdFe3.5 alloy consisting of Nd2Fe17 and Nd phases disproportionates into NdH2+δ and α-Fe. Subsequently, NdH2+δ decomposes when annealed from room temperature to 900 °C under vacuum, and H2 is released. Meanwhile Nd2Fe14C, NdC and little α-Fe phases are formed in the final product. H and C atoms come from the decomposition of heptane. Coercivity of 1.39 T and maximum magnetic energy product of 62.7 kJ m−3 have been achieved. Too short a ball-milling time results in the insufficient disproportionation of NdFe3.5 alloy and the residue of Nd2Fe17 phase in the final product. Too long a ball-milling time results in the appearance of NdC2 and more α-Fe phases besides Nd2Fe14C and NdC phases. Hexane (C6H14), octane (C8H18) and nonane (C9H20) have been proved to have a similar effect to heptane.