Search

Thisreview covers the production of solid carbonaceous materialsat high temperatures (above 500 °C) and high pressures. The revieworders the high temperature/high pressure (HTHP) studies by theirfinal product categories, namely carbon spheres, prolate spheroids(also known as ellipsoids and olivaries), nanotubes, and others suchas diamonds, fullerenes, composites, and nanostars. The mechanismsas well as the properties of the products are discussed. In particular,the literature pertaining to the production of carbon ellipsoids hasbeen collected for the first time. On one hand, the review concludesthat, due to the existence of other conventional and more practicalmethods, the production of nanotubes and spheres via HTHP does notappear to be industrially feasible. On the other hand, using the HTHPmethod to produce olivary carbons and other new and exotic productsseems attractive due to the absence of conventional methods for theirproduction. [ABSTRACT FROM AUTHOR]