Calcium belongs to mixed-crystalimpurity and must be removed in advance.
钙属于混晶型杂质,必须预先分离。
2
The ground state energies of a shallow donor impurity near a sharp surface of a semi-infinite crystal are studied.
本文用变分法计算了半无限晶体近表面内浅态施主杂质的基态能量。
3
The growing solution of DKDP crystal was synthesized firstly, then the source and possible introducing method of impurities were discussed by the measurement of metal ion impurity concentrations.