Besonderheiten des kristallwachstums AUF Cu2O-, CuO- UND NiO-Hochtemperatur-Zunderschichten

Crystal growth on high-temperature corrosion layers of Cu 2 O, CuO and NiO was investigated by electron microscopy. From kinetic reasons we derive the existence of a reaction diffusion layer (RD-layer) on surfaces of the growing corrosion layers acting as mother phase for the crystallization process. The RD-layer probably consists of oxide molecules. Another feature of crystal growth on high-temperature corrosion layers is the existence of faces which have grown repetitively and isotropically, in addition to smooth growth faces and such with subindividuals bounded by small and smooth surface elements. Also, the possibility of a transition from a lateral growth mechanism to one of continuous growth with increasing supersaturation in the RD-layer was observed. Needle growth can now be explained in analogy to “bulge growth”.