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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 ...
In an oxidative atmosphere, graphite is effective at high temperatures up to 450 °C continuously and can withstand much higher temperature peaks. Graphite is characterized by two main groups: natural and synthetic. Synthetic graphite is a high temperature sintered product and is characterized by its high purity of carbon (99.5−99.9% ...
Pyrolytic graphite is also more diamagnetic (χ = −4×10 −4) against the cleavage plane, exhibiting the greatest diamagnetism (by weight) of any room-temperature diamagnet. In comparison [ dubious – discuss ] , pyrolytic graphite has a relative permeability of 0.9996, whereas bismuth has a relative permeability of 0.9998 ( table ).
Graphite's high thermal stability and electrical and thermal conductivity facilitate its widespread use as electrodes and refractories in high temperature material processing applications. However, in oxygen-containing atmospheres graphite readily oxidizes to form carbon dioxide at temperatures of 700 °C and above. [31]
The graphene sheets are adsorbed to the high energy interface between the heptane and the water, where they are kept from restacking. The graphene remained at the interface even when exposed to force in excess of 300,000 g. The solvents may then be evaporated. The sheets are up to ~95% transparent and conductive. [19]
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]
[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.
Contrary to popular belief, high-purity graphite does not readily burn, even at elevated temperatures. [8] For this reason, it is used in nuclear reactors and for high-temperature crucibles for melting metals. [9] At very high temperatures and pressures (roughly 2000 °C and 5 GPa), it can be transformed into diamond. [citation needed]
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