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Once the resulting product has crystallized, the polymer will form crystals by heating the reaction mixture to a higher temperature.

By the thermodynamic nature of the crystallization process, impurity content in crystal should be limited to very low levels. The problem of impurities was first recognized in the late 19th century by U. Many studies have shown that the level of impurities in a crystal is determined by an enormous number of factors, such as, physical and chemical properties of the target material, impurities in the raw materials, equipment used for production, process conditions, raw material quality and contamination.

The most common impurities found in crystals are:. Carbon and oxygen are examples of elements present in small amounts, [10] whereas a toxic compound can be present in large amounts. The most common impurities in semiconductor crystals are transition metals, rare earth elements, oxygen, carbon, antimony, and arsenic. In order to prepare the crystals, the process requires multiple steps. Crystal growth can be conducted either by