Interphases in systems of conducting phases

Abstract

The document is an Appendix to the Manual of Symbols and Termino logy for Physicochemical Quantities and Units. Together with the other appendices notably that on Electrochemical Nomenclature, it expands the recom mendations for nomenclature in the region of interphases containing charged particles. After suggesting terms for the description of the interphase it self, there are sections outlining nomenclature for electric potentials at free surfaces (a condensed phase in contact with vacuum or dilute gas) and in interphases (the boundary between two dense phases). These include a di scussion of the electronic work function and the Volta (or contact).potential difference. Interphases between metals, semiconductors and electrolytes are discussed. Nomenclature for the thermodynamic properties of the in terphase at equilibrium is recommended including capacitances and components of charge. Quantities related to the description of the structure of the in terphase aré discussed and terms consistent with the present knowledge of this structure are recommended for the situations of the adsorption of ions or molecules and the possibility of partial charge transfer. Some general remarks are made about adsorption isotherms. The report concludes with some recommendations for the nomenclature of the mechanical properties of solid surface. © 1983 IUPAC