Anion Vacancy Concentration Research Articles

Diffusion Coefficients and Anion Vacancy Concentrations for the Zirconium‐Zirconium Dioxide System

Experiments have been carried out at 386°C to determine the concentration of anion vacancies at the metal‐oxide interface and the diffusion coefficients for anion vacancies in zirconium dioxide films on zirconium by the “interruption kinetic technique.” The conditions for which this technique is valid are discussed. The anion vacancy concentration in the oxide at the oxide‐metal interface (386°C) proved to be as compared to calculated from the phase diagram. Diffusion coefficients can be expressed as Theoretical calculation of the entropy of vacancy formation and values of Do are made assuming three models. It is concluded that electrons are trapped at anion vacancies or impurity centers, rather than act as Fermi‐electrons in the conduction band.

Dielectric Loss of Potassium Chloride

The dipolar contribution to the high-temperature dielectric loss of potassium chloride is shown to be unaffected by additions of strontium chloride that cause major changes in the frequency-independent volume conductivity, the cation vacancy concentration, and the anion vacancy concentration. The observations provide additional strong evidence that the dipoles responsible for the loss are vacancy pairs, since their concentration is not dependent on the strontium content of the crystal.

The influence of vacancies on the reduction of silver ions in silver doped alkali halides

Hydrogen treatment of alkali halide crystals doped with silver halide leads to a partial reduction of the silver ions. The fact that the reaction is incomplete appears not to be due to a chemical equilibrium but to a factor inherent in the crystal.Experiments with alkali halides, doped with Ag+ and divalent ions, show that the concentration of metallic silver formed is determined by the anion vacancy concentration. This fact is interpreted in terms of the agglomeration of silver atoms and vacancies.

9. The oxidation of praseodymium oxide. Part I. Chemisorption on praseodymium oxide

The first page of this article is displayed as the abstract.

The hydrolysis of solid CaF 2

Summary It could be shown that water vapor is the active component for the change of the properties of CaF 2 after a thermal treatment at higher temperatures. The reaction consists in the diffusion of anion vacancies or oxygen ions. Hydroxylions are only present in the beginning of the reaction. When an equilibrium concentration of anion vacancies is formed, the reaction proceeds further by coagulation of colloidal CaO particles. These specks precipitate principally along dislocation lines.

Determination of the Concentrations of Cation and Anion Vacancies in Solid Potassium Chloride

The mobility of cation vacancies and the equilibrium concentration of cation and anion vacancies in solid potassium chloride are calculated from measurements of the electrical conductivity of pure potassium chloride and solid solutions of strontium chloride in potassium chloride.