Abstract
The microscopic mixed fusion technique proposed by Kofler is a valuable method in furnishing numerous observations regarding eutectic melting of two-componental system and formation of molecular compounds. However, this technique requires pretreatment of the sample by fusion and recrystallization to prepare the test piece. The technique cannot be applied to substances which undergo decomposition by fusion or which cannot be recrystallized. In such cases, the two components are separately reduced to a fine powder, about 1mg. of each is placed on a slide glass, about 5mm. apart as shown in Fig. 2, and the powder is rubbed gently with a cover glass placed over them, so as to contact the two components partially. Heating of this powder results in appearance of a line of eutectic melt in the center of the contact zone. In this procedure, change of contact zone can be observed in comparison with pure components so that the identification of the eutectic point becomes more accurate. Further, the process can be utilized for the judgement of identity or differentiation of two substances and for examination of purity.
