— The overall stoichiometry compensation through transition ion valency changes has been studied in CuGaS2. For this purpose, Ni and Fe were used as ionic sensors of the matrix state, as these impurities are already present in the as-grown material. The valency changes could be observed either by electron spin resonance or Mossbauer absorption. With increasing sulphur content, the valency of Fe...

We review the topic of scanning tunnelling microscopy (STM) studies of silicides, with an emphasis on fundamental scientific issues that can be addressed using STM and ballistic-electron-emission microscopy (BEEM). The discussion is organized according to the topics of structure (atomic scale precursors, surface reconstructions, bulk structures, interfaces) kinetics and growth (direct atomic me...

The stoichiometry and hydrogen content of hot-wire (HW)-grown silicon nitride was examined as a function of SiH yNH 4 3 flow ratio. The effect of post-deposition hydrogenation treatment on overall film hydrogen content was determined. The hydrogen release properties in Si-rich and N-rich nitride layers were characterized by annealing treatments. Defect hydrogenation was studied using Fourier tr...

In this paper, the segregation of Ni impurity on open surfaces doped strontium titanate perovskite is investigated by means ab initio molecular dynamics method based density functional theory and applied to a model periodic cell with stoichiometry La 0.5 Sr TiO 3 (LST).The performed studies are recent experimental observations atoms their tendency form clusters at boundaries defect structure 0....

We describe models for the behavior of hot-pressed boron carbide that is subjected to extreme dynamic environments such as ballistic impact. first identify deformation and failure mechanisms are observed in under conditions, then review physics-based each these integration into a single continuum model material. Atomistic modeling relates composition stoichiometry amorphization threshold, while...

Ostwald ripening is a well-known physicochemical phenomenon in which smaller particles, characterized by high surface energy, dissolve and feed the bigger ones that are thermodynamically more stable. The effect commonly observed solid liquid solutions, as well systems consisting of supported metal clusters or droplets. Here, evidence provided for occurrence an oxide-on-metal system which, this ...