ジフェニルエーテル三重点の実現とその評価

抄録

The triple point of diphenyl ether is realized using small pyrex glass cells (35mm in diameter and 120mm in length). Commercially available diphenyl ether with the nominal purity of 99.0% is purified by the method of distillation and the zone-melting technique up to 99.998%, which is estimated from the melting curves by the thermal analysis. The solid-liquid phase transition temperature is determined to be 26.8633 (0.001) based on the International Temperature Scale of 1990. It is also found that the width of the melting curve and the length of the plateau depend on the freezing temperatures.