Ru/C multilayer mirrors with a period of 2.5 nm and 150 bilayers were studied under high-temperature annealing long-term storage. A general increase in the reflectivity was observed after at different temperatures from 300 to 700 °C, during which maximum enhancement around 14% obtained 600 °C. The highest reflectance measured 8 keV reached 69% °C annealing. This accompanied by 6% expansion laye...

The impact of interdiffusion on strain energy in the GaN-sapphire system was studied. Gallium nitride epitaxial layers were grown on (0001) Al2O3 by low-pressure MOCVD at 850 °C, V/III ratio = 3600, P= 100 Torr using TEGa and NH3 sources in a N2 carrier. The ~0.3 μm thick films were then annealed at growth temperature in N2 for a period of 30 to 120 min. The Al and Ga diffusion coefficients at ...

Reactive nanolaminates afford a promising route for the low-temperature synthesis of zirconium diboride, an ultrahigh-temperature ceramic with metallic properties. Although the addition of carbon is known to facilitate sintering of ZrB2, its effect on the kinetics of the formation reaction has not been elucidated. We have employed a combined approach of nanocalorimetry and first-principles theo...

Experiments on the formation of hollow nanocrystals of cobalt sulphide by way of the Kirkendall effect have been reported recently by Yin et al. We perform a set of Monte Carlo simulations of the process to explore the phenomenon. 1. Introduction A recent experiment on cobalt nanocrystals heated in sulphur at 180 ºC showed the fascinating formation of hollow nanospheres of cobalt sulphide by th...