FTIR spectroscopic and thermal studies of calcium tartrate trihydrate crystals grown by gel assistance

摘要

Single crystals of calcium tartrate trihydrate were grown by using silica gel as a medium. The gel was set by acidification of sodium metasilicate solution by orthophosphoric acid solution. The supernatant solution containing calcium chloride and tartaric acid was poured on the gel. However, this is in contrast to the usual growth technique for growing calcium tartrate crystals, where the gel is set with tartaric acid and calcium Chloride is used as a supernatant solution. The crystal growth and the role played by gel is discussed. The crystals were characterized by FTIR Spectroscopic technique and thermogravimetric analysis. A kinetics of dehydration was studied by using the Coast-Redfern, the Horowitz-Metzger and The Rreeman-Carroll Relations.