Dilatometrie - Grundlagen und Messverfahren

Thermal expansion is one of the properties of all materials which is important for both theory and practice. Ist interconnection with compressibility, mechanical stress, pressure, electric and magnetic properties and its dependence on the state of solids, which may be amorphous, composite, polycrystalline or crystalline with various symmetries is demonstrated by formulas and diagrams from literature. According to the wide range of temperatures from about 1 K to 4000 K, a wide variety of relative and absolute methods to measure thermal expansion is mentioned without, however, reference being made to all variants. Special emphasis is placed on methods for practical purposes, on methods which allow high precision to be achieved and on procedures suitable for special sample shapes and short-time measurements, for example, of thermal instable materials. The experimental handling and marginal conditions are discussed. Evaluation and conversion in the case of differing references are presented. Check lists are given for planning measurements and for purchasing a commercial dilatometer. Three tables show available reference materials and the range of the thermal expansion of natural and technical materials. References to the literature have been selected so as to provide access to all fields of dilatometry. Additional lists refer to materials for elementary studies, thermal expansion data, and the reports on the ''Conferences on Thermal Expansion'' which are held every two years. (orig.)Available from TIB Hannover: RN 2495(65) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman