This volume is a collection of the lectures presented at the NATO Advanced Study Institute "Interfacial Aspects of Phase Trans formations", held in Erice (Sicily) in 198t.The Institute was the seventh course of the International School of Crystallography, es tablished in the Center of Scientific Culture "Ettore Majorana" in 1974, with the guidance and inspiration of L. Riva di Sanseverino and A. Zichichi. The course organizers, R. Kern and myself, were advised and helped in developing the program, and in the choice of lecturers and participants, by R.F. Sekerka, F. Bedarida, J.L. Katz and J. G. Dash. Although the scope of the Institute (as reflected in the content of this book) might appear too wide, we believe that it responds to a real necessity. Both Surface Science and Crystal Growth (in cluding problems of nucleation, thin films, recrystallization etc.) have developed to an unusual extent during the last few decades. Each of these two fields have benefited from the knowledge of the other; good examples are the progress in evaporation/condensation thermodynamics and kinetics of organized (sub-)monolayers, the de velopement of new methods of preparing and characterizing atomical ly smooth or controlled vicinal (stepped) surfaces, etc.

Inhalt
The Structure of Clean Surfaces.- Electronic Structure and Cohesion.- Surface Thermodynamics.- Physisorption and Chemisorption.- Critical Phenomena in Two Dimensions: Theoretical Models and Physical Realizations.- Crystal-Melt, Crystal-Amorphous and Liquid-Vapor Interfaces.- The Intermolecular Nature of Liquid Water - The Hydration of Molecules and Ions.- On the Structure of Grain Boundaries in Metals.- Kinetics of Elementary Processes at Surfaces.- Three Dimensional Nucleation.- Three and Two Dimensional Nucleation on Substrates.- Coalescence of Nuclei on Substrates.- Crystal Growth Kinetics.- Physisorption: Structures and Interactions.- Chemisorption of Metals on Metals and on Semiconductors.- Chemisorption on Single Crystal and Heterogeneous Catalysis.- Growth by Vacuum Evaporation, Sputtering, Molecular Beam Epitaxy and Chemical Vapor Deposition.- Melt Growth.- Crystal Growth in Aqueous Solutions.- Crystals and Crystallization in Biological Systems.- Crystal Growth from Non Aqueous Solutions.- Electrocrystallization.- Recrystallization.- Impurity Effects in Crystal Growth from Solution.- Dissolution Phenomena.- Crystallographic Applications of Holographic Interferometry.- Studies of Surface Morphology on an Atomic Scale.