Abstract
Methods of secondary-electron emissiometry (SEE) and Anger spectrometry are used to study the thermostimulated surface segregation of components of complex oxides (illustrated by PbTiO3 single crystals) annealed in air and under vacuum. The concentration of the segregated phase TiO2 on the PbTiO3 surface reaches a maximum of 50 - 60% at an annealing temperature of 870 K in air. Annealing under vacuum (600 K) generates a deficit of anions of - 0.6 mole (TiO1.4) in the segregated surface layer. An absolute sensitivity to oxygen deficit better than 10(-2) mole can be reached. Advantages of the SEE method are simplicity of instrumentation, rapidity, high sensitivity to oxygen deficit, and the possibility of obtaining information about the PbTiO3 and TiO2 phases rather than about the elements Pb and Ti only (as is the ease in Auger analysis).