{"term":{"id":"00188","title":"agranular carbon","longtitle":"IUPAC Gold Book - agranular carbon","doi":"10.1351\/goldbook.A00188","code":"A00188","status":"current","definitions":[{"id":1,"text":"A monogranular or monolithic carbon material with homogeneous microstructure which does not exhibit any structural components distinguishable by optical microscopy.","notes":{"1":"The above definition of a homogeneous microstructure does not pertain to pores and structural components which may be visible by contrast differences in optical microscopy with polarized light. As a consequence, glass-like carbon with visible pores is still an agranular carbon. The same is true, for instance, for pyrolytic carbon with preferred orientation, such as conical or lamellar structures, visible in optical microscopy with polarized light. Use of the term agranular carbon is not restricted to bulk materials of a minimum size. Only particulate carbon should be excluded even if the isolated particles exhibit a homogeneous microstructure."},"links":[{"term":"carbon material","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/C00841"},{"term":"glass-like carbon","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/G02639"},{"term":"particulate carbon","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/P04433"},{"term":"pyrolytic carbon","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/P04963"},{"term":"visible","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/VT07496"}],"sources":["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)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/A00188\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/A00188\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/A00188\/plain"},"citation":"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. 10.1351\/goldbook.A00188","license":"The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https:\/\/creativecommons.org\/licenses\/by-sa\/4.0\/) for individual terms.","collection":"If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org .","disclaimer":"The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.","accessed":"2026-04-18T21:52:39+00:00"}}