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The size of these particles is extremely small, only in um, and they are located on the boundary of crystal.
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µôϵÄʯͷ(½ð±Ò+5, ·­ÒëEPI+1): лл 2011-10-20 14:11:43
These grains have a very small size,  with only a few micrometers, and are mainly distributed at the crystal boundaries.
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