Molecular dynamics study of the influence of supercooling temperature and orientation of the crystallization front on its velocity in silver

The molecular dynamics method was used to study the influence of the supercooling temperature and the orientation of the crystallization front relative to the growing crystal on the front velocity in silver. According to the data obtained, the crystallization velocity with an increase in the supercooling temperature does not increase monotonically, but has a maximum at about 0.7-Tm (Tm is melting temperature), after which it gradually decreases, which is explained by a decrease in the diffusion mobility of atoms in the amorphous phase. Crystallization proceeds faster with the orientation of the front plane (100), slower - with the (110) and (111) orientations.

Tuning exciton diffusion, mobility and emission line width in CdSe nanoplatelets via lateral size

We investigate the lateral size tunability of the exciton diffusion coefficient and mobility in colloidal quantum wells by means of line width analysis and theoretical modeling.

Compensating H+ and Li+ ions in quartz structural channels of the gold fields of Darasun ore field (Eastern Transbaikal, Russia): electron paramagnetic resonance data

The composition and diffusion mobility of the compensating ions in the quartz structural channels of the gold fields in the Darasun, Teremkinskoye, and Talatuy gold fields of the Darasun ore field were examined using the electron paramagnetic resonance method. The assessment of the properties and peculiarities of the ion distribution in quartz was based on their ability to participate in the neutralization of the electric charges of the structural defects occurring in the minerals. In this regard, the ion composition was evaluated by the ratio of the concentrations of the Ti-centers using various compensators. Their mobility was determined by the center formation rate during the quartz radiation exposure. The research demonstrated the availability of two major compensating ions, H+ and Li+, in the quartz structural channels of the gold fields in the Darasun ore field. The diffusion mobility of the H+ ions in the channels was observed to be 1–2 orders of magnitude higher than that of Li+. The correlation link between the compensating ions in the mineral and fluid compositions was not obtained based on the data analysis. A difference was identified between the ratio of the H+ and Li+ concentrations in the quartz structural channels of different fields. Further, the highest concentration of H+ ions and the lowest concentration of Li+ ions were recorded for the quartz in the Darasun field; the inverse correlation was observed for the quartz in the Talatuy field, which can be attributed to the mixing of the fluid gas component during the ore formation process. The electron paramagnetic resonance method can be used for the quantitative assessment of the degree of quartz dynamic recrystallization.