Y2(Fe1-xSix)14B的中子衍射研究

Nd₂Fe₁₄B是一种磁能积很高的优良的永磁材料,但在实用上稍嫌它的居里温度低了一点。为了提高它的居里温度,人们曾用某些元素替代其中的一些铁作了尝试。文献9]及我们最近的实验表明:用硅代替部分铁之后,材料的居里点都获得了提高。本文用中子衍射法研究了Si在Y₂Fe₁₄B中的占位情况,以了解Si对磁性能产生的影响。中子衍射的结果表明:Si择优地占据c,j₁及k₂晶位。最后,用磁交换作用对结果进行了讨论。 关键词：

NEUTRON DIFFRACTION STUDY OF Y2(Fe1-xSix)14B

The outstanding permanent magnetic material Nd₂Fe₁₄B possesses very high energy product. But its Curie temperature is a little bit too low for practical application. Some elements were added into the material in order to raise the Curie temperature. Reference 9] and our recent experimental results show that the Curie temperature can be made higher by partiy subsituting silicon for iron in the material and in Y₂Fe₁₄B. For understanding the effect of silicon on magnetism, the occupancy of Si in Y₂Fe₁₄B was studied by neutron diffraction. The neutron diffraction results show that silicon occupies preferentially the sites of c, j₁, and k₂. The magnetic interaction theory is applied to explain the experimental results.