Cation Vacancy Diffusion Coefficient in NiO

Interaction and ordering of vacancy defects in NiO

Sohee Park,1 Hyo-Shin Ahn,1 Choong-Ki Lee,1 Hanchul Kim,4 Hosub Jin,2 Hyo-Sug Lee,3 Sunae Seo,3 Jaejun Yu,2 and Seungwu Han1,* 1Department of Physics, Ewha Womans University, Seoul 120-750, Republic of Korea 2School of Physics and CSCMR, Seoul National University, Seoul 151-747, Korea 3Samsung Advanced Institute of Technology, Suwon 440-600, Korea 4Korea Research Institute of Standards and Scie...

Cation-anion vacancy complexes in semiconducting compounds

Plastic deformation, vacancy diffusion, and vacancy delocalization in bcc 3He.

The plastic deformation of bee 3He crystals has been studied near the melting curve, in the temperature range 0.65 K :::; T:::; 1.17 K, and for strain rates, E, from 2X 10to 2X 10sec-I. The resulting relations between strain rate and stress, at a given temperature, are accounted for in terms of dislocation climb and vacancy diffusion in the solid He. The temperature dependence of the strain rat...

Interlayer vacancy diffusion and coalescence in graphite

Due to the layered nature of graphite, the migration and interaction of point defects in the graphite crystal structure are highly anisotropic, and it is usually assumed that individual mobile lattice vacancies are confined to diffuse on a single plane. We present the results of ab initio calculations based on density functional theory which demonstrate that vacancies can, in fact, move between...

The cation-vacancy ordering transition in dehydrated Na 6 sodalite

Variable-temperature synchrotron x-ray powder diffraction data from dehydrated Na 6 ͓Al 6 Si 6 O 24 ] reveal a structural phase transition that involves both the commensurate ordering of the extra-framework Na cations and a one-dimensional incommensurate modulation of the framework. Peak splittings and superlattice reflections implicate an orthorhombically-distorted volume-doubled supercell at r...