In Quartz Reaction Vessels

Ill) In Quartz Reaction Vessels. At lower temperatures, a quartz reaction tube may be used. For example, to prepare KsSbTes, a stoichiometric amount of the reagents (in 3 mmol quantities) is placed in a quartz tube and sealed under vacuum in a larger quartz tube. The sample is heated at 550°C for 6 h and then cooled slowly to ambient temperature over the course of 28 h. A crystalline solid of the targeted stoichiometry is isolated ... 

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