區(qū)域精煉原理（區(qū)域提煉）

Zone Refiner Theory區(qū)域精煉原理（區(qū)域提煉）

During zone refining or zone melting short molten zones move slowly through an elongated sample of crystalline material.   A molten zone traversing a solid sample has two liquid-solid interfaces; a melting interface and a freezing interface. At the melting interface the sample is merely melted and mixed with the contents of the molten zone. At the freezing interface the crystals tend to be higher in purity than the liquid phase.

在區(qū)域精煉或區(qū)域熔化期間，短的熔融區(qū)域緩慢地移動(dòng)通過細(xì)長的結(jié)晶材料樣品。 穿過固體樣品的熔融區(qū)具有兩個(gè)液 - 固界面; 熔化界面和冷凍界面。 在熔化界面處，樣品僅熔化并與熔融區(qū)的內(nèi)容物混合。 在冷凍界面處，晶體的純度往往高于液相。

Extraordinarily high purification of chemicals can be obtained by repeatedly passing the molten zone or zones through the sample. The impurities are concentrated at the end of the sample, generally in the direction of the movement of the molten zone.

通過使熔融區(qū)域重復(fù)通過樣品，可以獲得非常高的化學(xué)品凈化。 雜質(zhì)在樣品的末端濃縮，通常在熔融區(qū)的移動(dòng)方向上。

Mathematically this can be expressed as a constant, K, known as the distribution coefficient.  If the concentration of impurity in the solid (crystalline) phase is Cs and the concentration of impurity in the liquid phase is Cl then K is Cs/Cl.  If K is less than 1 (the usual case), the impurities will follow the movement of the liquid zone; if K is greater than 1, the impurities will travel in the opposing direction.

在數(shù)學(xué)上，這可以表示為常數(shù)K，稱為分布系數(shù)。 如果固體（結(jié)晶）相中的雜質(zhì)濃度是Cs并且液相中的雜質(zhì)濃度是Cl，則K是Cs / Cl。 如果K小于1（通常情況下），雜質(zhì)將跟隨液體區(qū)的運(yùn)動(dòng); 如果K大于1，則雜質(zhì)將沿相反方向行進(jìn)。