نتایج جستجو برای: diamonds
تعداد نتایج: 1532 فیلتر نتایج به سال:
Small-angle X-ray scattering (SAXS) was performed on single-crystal chemical vapor deposition (CVD) diamonds with low nitrogen concentrations, which were fabricated by microwave plasma-assisted chemical vapor deposition at high growth rates. High optical quality undoped 500 µm-thick single-crystal CVD diamonds grown without intentional nitrogen addition proved to be excellent as windows on SAXS...
Diamond microcrystals have been synthesized using ultrasonic cavitation of a suspension of hexagonal graphite in various organic liquid media, at an average bulk temperature of the liquid up to 120°C and at atmospheric pressure. The yield of diamond is up to 10% by mass. The diamonds were characterized by scanning electron microscopy, X-ray diffraction and laser Raman spectroscopy. Analysis of ...
Abstract We report on the optical properties of He-related color centers created by He-ion implantation and subsequent thermal annealing in natural diamonds, including temperature (300–700 K) excitation power (1–1800 kW/cm 2 )-dependent photoluminescence (PL) measurements. The prospects for use He-implanted diamonds sensing are discussed. effect fast neutron irradiation Si-V CVD were also exami...
This article examines the making and makers of “memorial diamonds.” These are “natural” diamonds identical to gemstones found in nature but produced laboratories with carbon sourced from genetic material (cremation ashes) or other objects symbolic emotional value. Threading corporality objectified life forms, we examine transformation ashes “afterlife” these “living” that at once synthetic orga...
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