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首页> 外文期刊>IEEE Transactions on Magnetics >Structural and Magnetic Properties of ${hbox{TbCu}}_{7}$ -type ${hbox{SmCo}}_{7-x}{hbox{Ni}}_{x}$ Magnets Produced by Mec
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Structural and Magnetic Properties of ${hbox{TbCu}}_{7}$ -type ${hbox{SmCo}}_{7-x}{hbox{Ni}}_{x}$ Magnets Produced by Mec

机译：Mec生产的$ {hbox {TbCu}} _ {7} $型$ {hbox {SmCo}} _ {7-x} {hbox {Ni}} _ {x} $磁铁的结构和磁性

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摘要

We have prepared nanograin magnetic powders of ${rm SmCo}_{7-x}{rm Ni}_{x}$ ($x=0$, 0.2, 0.3, 0.4, 0.5, 0.6, 1.0, 1.5, 2.0) alloys by ball milling followed by annealing at 700$;^{circ}{rm C}$ for 2 h. Samples with $x=0$ –1.0 show a single ${rm TbCu}_{7}$-type phase (1$thinspace$: $thinspace$7) structure, and the lattice parameters $a$ and $c$ of this structure decrease as the Ni content increases. The Curie temperature $(T_{c})$ of the 1 $thinspace$: $thinspace$7 phase also decreases with increasing $x$, from 897$;^{circ}{rm C}$ at $x=$ 0 to 771$;^{circ}{rm C}$ at $x=1.5$ in these samples, but it is still found that the $T_{c}$ of these ${rm SmCo}_{7-x}{rm Ni}_{x}$ samples is much higher than that-n-n of the equivalent ${rm SmCo}_{7-x}{rm M}_{x}$ compounds, where M represents substituting atoms such as Ti, Zr, Cu, and Hf. Good square hysteresis loops are observed in the fine-grained samples with single 1$thinspace$:$thinspace$7 phase structure, and high room-temperature intrinsic coercivities $(_{i}H_{c})$ of larger than 1.1 T are obtained in the samples with $x=0hbox{–}1.5$ . The temperature coefficient $(beta)$ of the $_{i}H_{c}$ was about $-0.2%/^{circ}{rm C}$ in the temperature range of 25 $;^{circ}{rm C}$–400 $;^{circ}{rm C}$.
机译：我们准备了$ {rm SmCo} _ {7-x} {rm Ni} _ {x} $（$ x = 0 $，0.2，0.3，0.4，0.5，0.6，1.0，1.5，2.0）的纳米晶粒磁粉通过球磨对合金进行退火，然后在700°C退火2小时。 $ x = 0 $ –1.0的样本显示单个$ {rm TbCu} _ {7} $类型的相（1 $ thinspace $：$ thinspace $ 7）结构，以及该点的晶格参数$ a $和$ c $随着Ni含量的增加，组织降低。 1 $ thinspace $：$ thinspace $ 7阶段的居里温度$（T_ {c}）$也随着$ x $的增加而降低，从897 $; ^ {circ} {rm C} $在$ x = $ 0到这些样本中的771 $; ^ {circ} {rm C} $为$ x = 1.5 $，但仍然发现这些$ {rm SmCo} _ {7-x} {rm中的$ T_ {c} $ Ni} _ {x} $个样本比等效的$ {rm SmCo} _ {7-x} {rm M} _ {x} $个化合物的n-nn高得多，其中M表示取代原子，例如Ti，Zr ，Cu和Hf。在单相1 $ thinspace $：$ thinspace $ 7相结构的细颗粒样品中观察到了良好的方形磁滞回线，并且高室温固有矫顽力$（_ {i} H_ {c}）$大于1.1T。在具有$ x = 0hbox {–} 1.5 $的样本中获得。 $ _ {i} H_ {c} $的温度系数$β$在25 $的温度范围内约为$ -0.2％/ ^ {circ} {rm C} $ C} $ – 400 $; ^ {circ} {rm C} $。

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