用超声分散法制备了球形与树枝状铋纳米晶体；
Spherical and dendritic Bi nanocrystals were prepared by ultrasonic dispersion method.
树枝状晶体主要是由铁的氧化物——磁铁矿组成。
The branch shape crystallite is mainly composed of iron oxides, i. e. magnetite.
发现钨和碳化钨粉形状复杂，多为树枝状或链状颗粒团形式，碳化钨粉中有较多的晶体缺陷。
It indicates that the shape of W and WC grains is varied, such as dendritic and chain structure, and there are many crystal defects in WC grains.
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