钙属于混晶型杂质，必须预先分离。
Calcium belongs to mixed-crystal impurity and must be removed in advance.
就现行P型杂质扩散工艺的不足，进行了开旮铝镓掺杂技术的研究。
Taking account of the disadvantage of current P-type impurity diffusion technology, an open tube gallium-aluminium diffusion technology is investigated.
XRD 图谱表明，阴极材料结晶完整，为均一橄榄石型结构，仅含少量三价铁杂质。
XRD patterns showed that the cathode material is well-crystallized, homogeneous olivine-type phase, with only tiny trivalence iron impurities.
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