The growth of transparent single crystals of sodium chloride (NaCl) in agar and silica gels up to 4 x 4 x 4 mm size is reported. A brief description of the material preparation, growth procedure and crystal nucleation is given. Hydrochloric acid was used to crystallize NaCl incorporated in the gel which reduces the solubility of NaCl in the gel media. Crystalline perfection has been studied using the chemical etching method.Es wird iiber das Wachstum von transparenten NaC1-Kristallen (bis zu 4 x 4 x 4 mm GroBe) in Agar-und Silicagel berichtet. Dazu erfolgt eine kurze Beschreibung der Materialvorbereitung, des Wachstumsvorganges und der Keimbildung. ChlorwasserstoffsLure verringerte die Loslichkeit von NaCl im Gel. Die Kristallperfektion wurde mit Hilfe des chemischen Atzens untersucht.
Single crystals of tin-iodide (SnT,) have been grown using the controlled reaction between SnCl, and K I by diffusion process in gel medium. As grown (010) surfaces of the crystals have been optically studied. Characteristic etch pits have been observed on them. This suggests that SnI, crystals might go into dissolution in the acid-set gel. By successively etching (010) surfaces in a mixturc of ammonia,, acetic acid, and CdCl, solution, it is established that the pits indicate the site of dislocations in the crystals. This is further confirmed by comparing the etch patterns before and after chemically polishing (010) surfaces. The average dislocation density in the crystals have been evaluated and found to be 3.2 x lo3 a,nd the implications are discussed.
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