agranular carbon
A monogranular or monolithic @C00841@ with homogeneous microstructure which does not exhibit any structural components distinguishable by optical microscopy.
The above definition of a homogeneous microstructure does not pertain to pores and structural components which may be @VT07496@ by contrast differences in optical microscopy with polarized light. As a consequence, @G02639@ with @VT07496@ pores is still an agranular carbon. The same is true, for instance, for @P04963@ with preferred orientation, such as conical or lamellar structures, @VT07496@ in optical microscopy with polarized light. Use of the term agranular carbon is not restricted to bulk materials of a minimum size. Only @P04433@ should be excluded even if the isolated particles exhibit a homogeneous microstructure.
PAC, 1995, 67, 473. (Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)) on page 476 [Terms] [Paper]