Phase and structural changes during heat treatment of additive manufactured CrFeCoNi high-entropy alloy

In the current study, the effect of a post-printing heat treatment at 400-1000 ℃ for 24 h and for 21 days on the changes in structures and phase compositions of an AM CrFeCoNi alloy prepared by the laser powder bed fusion AM technique is presented to better understand a heat treatment-microstructure-property relationship of the AM HE

Carbon nanowalls in field emission cathodes

The carbon nanowall (CNW) layers were grown from a gas mixture of hydrogen and methane, activated by a DC glow discharge, on Si substrates (Si/CNW layered structure). The second layer of CNW was grown either on the first layer (Si/CNW/CNW structure) or on Ni or NiO films deposited on the first CNW layer (Si/CNW/Ni/CNW and Si/CNW/NiO/CNW structures). The composition and structure of the resulting layered structures were studied using scanning electron microscopy, Raman spectroscopy, and X-ray diffractometry. It was found that annealing of Si/CNW structure in vacuum, growing of the second CNW layer on Si/CNW, as well as deposition of Ni or NiO films prior to the growing of the second CNW layer improve functional properties of field emission cathodes based on the electron-emitting CNW layers

Experimental Demonstration of Broadband Optical Tamm States in Photonic Crystal

Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала

Experimental demonstration of broadband optical tamm states in photonic crystal

Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.We present the theoretical and experimental investigations of optical bound state at the interface of photonic crystal and metal film. The reflectance of the wide-gap photonic crystal can be suppressed by absorption in broadband spectral range