Ac impedance measurements substantiated the existence of relatively stable tungsten-oxychlorides formed due to the incorporation of chloride ion in the anodic oxide film on tungsten during the oxide growth.
After only a few years, osmium was replaced by the more stable metal tungsten.
Quantitative analysis of the data accounts for the formation of stable reduced "tungsten-browns" from the 6- and 12-electron reduced forms, and "tungsten-reds" from the 18- and 24-electron reduced forms.
It was observed that they are active but they are less stable than molybdenum and tungsten oxynitrides when exposed to air.
The obtained results indicate that amorphous-like tungsten is thermally stable up to 450 °C.
In a precarious world, tungsten, at least, was stable.
To improve the synthesis efficiency of ferromagnetic GEM (Fe, Co, and Ni), synthetic diamond was used as carbon source, replacing thermodynamically stable graphite, on a custom-designed tungsten arc-discharge device.
The optical properties of the QDs remained stable under continuous illumination with a tungsten lamp (5 mW/cm) for up to 24 h, demonstrating the potential use of Ag2S QDs for longitudinal imaging without loss of fluorescence over time (Supporting Information Figure S3).
Besides, the LED light source could warm up to a stable status much faster than the halogen tungsten lamp.
XRPD analysis evidenced that in the presence of tungsten the anatase phase was stable even after calcination at 700 °C, with a progressively larger surface area and smaller particle dimensions with increasing tungsten content.
In the search for stable, visible light active photoelectrodes, hydrothermally synthesized tungsten oxide nanowires were modified via nitrogen incorporation into their structure.
