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Annealed Pyrolytic Graphite (APG), also known as Thermally Annealed Pyrolytic Graphite (TPG), [1] is a form of synthetic graphite that offers excellent in-plane thermal conductivity. As with pyrolytic carbon or pyrolytic graphite (PG), APG is also low in mass, is electrically conductive , and offers diamagnetic properties that allow it to ...
The quality of natural graphite varies as a result of the ore quality and its post-mining processing. The end product is graphite with a content of carbon (high grade graphite 96−98% carbon), sulfur, SiO 2, and ash. The higher the carbon content and the degree of graphitization (high crystalline) the better the lubricity and resistance to ...
This produces improved alignment of the graphite crystallites and an interplanar spacing close to that observed in natural graphite. The "stress recrystallization" of graphite was first described by L. C. F. Blackman and Alfred Ubbelohde in 1962. [2] The diameters of the individual crystallites in HOPG are typically in the range 1–10 μm. [3]
Another high-temperature lubricant, hexagonal boron nitride, has the same molecular structure as graphite. It is sometimes called white graphite, due to its similar properties. When a large number of crystallographic defects bind these planes together, graphite loses its lubrication properties and becomes what is known as pyrolytic graphite.
A large sample of glassy carbon, with 1 cm 3 graphite cube for comparison A small rod of glassy carbon Vitreous-glassy carbon crucibles. Glass-like carbon, often called glassy carbon or vitreous carbon, is a non-graphitizing, or nongraphitizable, carbon which combines glassy and ceramic properties with those of graphite.
[4] [5] KC 8 is a superconductor with a very low critical temperature T c = 0.14 K. [6] Heating KC 8 leads to the formation of a series of decomposition products as the K atoms are eliminated: [citation needed] 3 KC 8 → KC 24 + 2 K. Via the intermediates KC 24 (blue in color), [3] KC 36, KC 48, ultimately the compound KC 60 results.
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