Particle Size Dependence of Iron on the Fe16N2 Formation by Low Temperature Nitridation
Particle Size Dependence of Iron on the Fe16N2 Formation by Low Temperature Nitridation
复制标题
铁对低温氮化形成 Fe16N2 的粒径依赖性
DOI：
10.2497/jjspm.53.329
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
S. Kikkawa
中科院分区：
文献类型：
--
作者：
T. Takeda;K. Kubota;S. Kikkawa
采用α-Fe2O3衍生的不同粒径（60nm、120nm、300nm） α-Fe细颗粒在200℃以下渗氮，研究了α-Fe晶粒尺寸对巨磁化Fe16N2形成的影响。最大的α-Fe粒子（300nm）氮化较难得到Fe16N2。对较小的α-Fe颗粒（120nm, 60nm）进行氮化处理，得到Fe16N2与未反应α-Fe和Fe4N的混合物。α-Fe颗粒为120nm时，氮化过程可控，可获得最多的Fe16N2。Fe16N2的形成并没有增强磁化强度，这可能是由于引入Fe晶格的氮的无序性所致。用铁（CO）5在辛醚中热分解得到单分散的α-铁颗粒。它们的大小可以通过在醚中添加稳定剂的量来控制。在低温氮化过程中，它们可以被氮化成Fe16N2。
The dependence of α-Fe particle size on the formation of Fe16N2 with giant magnetization was studied by nitriding α-Fe fine particles below 200°C with different particle size (60nm, 120nm, 300nm) derived from α-Fe2O3. Nitridation of the largest α-Fe particle (300nm) was difficult to obtain Fe16N2. Mixtures of Fe16N2 with unreacted α-Fe and Fe4N were obtained by nitridation of the smaller α-Fe particles (120nm, 60nm). The nitridation process was most controllable for α-Fe particle of 120nm to obtain the most amount of Fe16N2. Magnetization was not enhanced by the formation of Fe16N2 probably due to disordering of the nitrogen introduced into Fe lattice. Monodispersed α-Fe particles could be obtained by thermal decomposition of Fe(CO)5 in octylether. Their size could be controlled with the amount of added stabilizer in the ether. They could be nitrided to Fe16N2 in low temperature nitridation.