20Congreso Nacional 
Sociedad Mexicana de Ciencia de Superficies y Vacío A.C.

Thermomechanical Properties of Optoelectronic Materials:
Thermal conductivity and expansion coefficient

Manuel Cardona

During the past 10 years, and as a result of the collapse of the Iron Curtain, macroscopic quantities of isotopically pure elements have become available at affordable prizes. With them, high purity crystals of several optoelectronic materials (Ge, Si, GaAs, ZnSe, etc) have been grown with tailor made isotopic compositions. Some of them have found technological applications but all of them have yielded important information concerning basic physical properties such as phonons end electronic excitations. Among these properties we shall discuss the thermal expansion and the thermal conductivity , properties which are intimately related to the anharmonic nature of the lattice vibrations.  The mechanisms determining these properties and their dependence on isotopic composition will be discussed and illustrated with experiments. It will be shown , in particular, that the isotopically pure materials exhibit very large thermal conductivities that can be advantageously used in optoelectronic devices.

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