MAGNETIC-PROPERTIES OF ND2FE14-XBEXB

The Be-substituted Nd2Fe14B compounds of the type Nd-2(Fe14-xBex)B hav e been successfully prepared. Their phase formation and magnetic prope rties have also been characterized. The X-ray diffraction studies on p owder samples show a linear reduction of the unit cell volume with the Be substitution, which suggests that the Be atoms enter almost exclus ively the Fe sites. Both the Curie temperature and magnetization an re duced upon the Be substitution; the reduction in T-C is about 26 K per one substituting Be atom and the reduction in the average Fe moment i s about 0.26 mu(B)/Be atom, respectively. The room temperature anisotr opy of Be substituted Nd-2(Fe14-xBex)B compounds is around 8 T which i s nearly unchanged, compared to the parent Nd2Fe14B compound. Moreover , the Be substitution leads to an increase in the canting angle at 10 K, from 28 degrees to similar to 36 degrees, and a decrease in the spi n-reorientation temperature from 131 K to 123 for B3(0.5) and 112 K fo r Be(1.0)substitution, respectively. These effects indicate a weakened A(20) value and/or an enhanced A(40) value for Nd atoms.