| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide magnesium oxide powder having a sufficiently low content of lead as an impurity. <P>SOLUTION: The magnesium oxide powder having 99.9 mass% or more of purity and a content of Pb of less than 0.1 ppm, wherein a half-value width of a peak of surfaces (111), (200), and (220) in powder X-ray diffraction measurement using Cu-Kα-ray is 0.20° or less, respectively and D<SB POS="POST">50</SB>is 0.1-10 μm. <P>COPYRIGHT: (C)2013,JPO&INPIT |
