Summary of Melting and Transition Temperatures of Pure Substances and Congruent and Incongruent Melting Temperatures of Molecular Addition Compounds

Abstract

Melting temperatures, along with transition temperatures when they occur, are summarized for 70 pure chemicals used as the components in the study of 112 binary (solid + liquid) phase diagrams reported by us over the past 35 years. The melting temperatures and compositions of 68 solid molecular addition compounds determined as a part of these studies are also reported, and the proposed molecular interactions leading to the formation of these addition compounds are reviewed and discussed. Temperatures were measured with strain-free platinum resistance thermometers (Leeds and Northrup or Rosemount) that were calibrated to conform with the ITS-48 or the IPTS-68 temperature scales. The temperature scale used is estimated to be accurate to ±0.02 K over the temperature range of the measurements. Equations are given to convert temperature from ITS-48 or IPTS-68 to the more recent ITS-90 scale, and used to convert the temperatures reported in the tables to ITS-90.