caa a22 4500 388019425 CHVBK 20180307124919.0 cr unu---uuuuu 161130e199812 xx s 000 0 eng 10.1557/JMR.1998.0459 doi S0884291400046732 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0459 Metallothermic reduction as an electronically mediated reaction [Elektronische Daten] The commonly held view that metallothermic reduction is strictly a chemical reaction and that the process is rate limited by mass transfer has been found to be incomplete. In a study of the production of tantalum powder by the reaction of K2TaF7 with sodium, it has been shown that there are two dominant kinetic pathways, both involving electron transfer. Furthermore, the overall rate of reaction is limited by electron transport between the reactants. This indicates that metallothermic reduction is an "electronically mediated reaction” (EMR). Experiments found that the location of the tantalum deposit and its morphology are governed by the reaction pathway. Copyright © Materials Research Society 1998 Okabe Toru H. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307 Sadoway Donald R. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307 Journal of Materials Research Cambridge University Press 13/12(1998-12), 3372-3377 0884-2914 13:12<3372 1998 13 JMR https://doi.org/10.1557/JMR.1998.0459 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0459 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Okabe Toru H. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307 NATIONALLICENCE 700 1- Sadoway Donald R. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307 NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/12(1998-12), 3372-3377 0884-2914 13:12<3372 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge