Diffusion creep of oxide ceramic and point defects in crystals

Experimental data on the effect of thermal, impurity, and nonstoichiometric vacancies on the diffusion creep of oxide ceramics at high temperatures and low mechanical loads are presented. It is shown that impurity and nonstoichiometric vacancies have the main effect on creep for materials of technical purity. The experimental data are fully described within the framework of the quasi-chemical approach, according to which the concentration of vacancies is determined by the law of mass action for the corresponding reactions of defect formation. Il. 8, bibliography: 16 titles.