Abstract
We have clarified the behavior of impurities in sodium chloride crystals using secondary ion mass spectrometry.
1) In the case of monopoly salts, calcium and magnesium decreased from the surface toward the inside of the crystals. Their amount was very low inside. On the other hand, potassium concentration at the surface and inside of the crystals was almost the same.
2) In the case of crystals prepared by settling down, the amount of calcium and magnesium in the crystals was very low. On the other hand, potassium was contained in the crystals, and its concentration in creased exponentially in proportion to the potassium concentration in the mother liquor.
3) Potassium entered the sodium chloride crystal lattice where sodium ions should be situated.
4) In the case of crystals composed of sodium chloride and potassium chloride, sodium entered the crystals easier than potassium.
