Vacancy and interstitial oxide ion migration in heavily doped La2−xSrxCoO4±δ

The role of vacancy on trapping interstitial O in heavily As-doped Si

We have investigated the interstitial oxygen Oi diffusion in heavily arsenic As -doped Si using first-principles calculations. We show that it is not the As per se but the Si vacancy V that trap Oi to reduce its diffusion. Arsenic actually plays the role of an arbitrator to activate thermal generation of As–V pairs, which in turn trap Oi with a large binding energy of 1.0 eV, in quantitative ag...

Vacancy and interstitial depth profiles in ion-implanted silicon

An experimental method of studying shifts between concentration-versus-depth profiles of vacancyand interstitial-type defects in ion-implanted silicon is demonstrated. The concept is based on deep level transient spectroscopy measurements utilizing the filling pulse variation technique. The vacancy profile, represented by the vacancy–oxygen center, and the interstitial profile, represented by t...

Interstitial Oxide Ion Order and Conductivity in La1.64Ca0.36Ga3O7.32 Melilite**

Solid oxide fuel cells (SOFCs) are a major candidate technology for clean energy conversion because of their high efficiency and fuel flexibility. The development of intermediate-temperature (500–750 8C) SOFCs requires electrolytes with high oxide ion conductivity (exceeding 10 2 Scm 1 assuming an electrolyte thickness of 15 mm). This conductivity, in turn, necessitates enhanced understanding o...

Interactions and superconductivity in heavily doped MoS2

We analyze the microscopic origin and the physical properties of the superconducting phase recently observed in MoS2. We show how the combination of the valley structure of the conduction band, the density dependence of the screening of the long-range Coulomb interactions, the short-range electronic repulsion, and the relative weakness of the electron-phonon interactions makes possible the exis...

Separation of vacancy and interstitial depth profiles in ion-implanted silicon: Experimental observation