Purifying Gallium Only by this way, because of some major impurities separated out seriously, often forms individual impurity element to exceed mark, and causes product grade to reduce.
单一电解法提纯镓，由于一些主要杂质析出严重，常常形成个别杂质元素超标，造成产品品级降低。
2
The results showed that good purification effects can be obtained, in which not only major coarse impurity particles was removed but also shrinkage porosity was effectively abated.
研究表明，该方法可以实现良好的净化效果。不仅过滤了绝大多数粗大夹杂物，而且对减少显微缩孔十分有效。
3
The impurity of iron is one major heavy-metal contamination on the silicon wafer. Surface photo-voltage method(SPV) can be used to accurately measure the iron contamination within the silicon wafer.