Term: agranular carbon
https://doi.org/10.1351/goldbook.A00188

Definition:
A monogranular or monolithic carbon material with homogeneous microstructure which does not exhibit any structural components distinguishable by optical microscopy.

Note: 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.

Related Terms:
1) visible (http://doi.org/10.1351/goldbook.VT07496).
2) glass-like carbon (http://doi.org/10.1351/goldbook.G02639).
3) pyrolytic carbon (http://doi.org/10.1351/goldbook.P04963).
4) particulate carbon (http://doi.org/10.1351/goldbook.P04433).
5) carbon material (http://doi.org/10.1351/goldbook.C00841).

Source: PAC, 1995, 67, 473. 'Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)' on page 476 (https://doi.org/10.1351/pac199567030473)

Citation: 'agranular carbon' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.A00188

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