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| Gualda,Guilherme A.R.; Vlach,Silvio R.F.. |
| An important drawback of the electron microprobe is its inability to quantify Fe3+/Fe2+ ratios in routine work. Although these ratios can be calculated, there is no unique criterion that can be applied to all amphiboles. Using a large data set of calcic, sodic-calcic, and sodic amphibole analysis from A-type granites and syenites from southern Brazil, weassess the choices made by the method of Schumacher (1997, Canadian Mineralogist, 35: 238-246), which uses the average between selected maximum and minimum estimates. Maximum estimates selected most frequently are: 13 cations excluding Ca, Na, and K (13eCNK - 66%); sum of Si and Al equal to 8 (8SiAl - 17%); 15 cations excluding K (15eK - 8%). These selections are appropriate based on crystallochemical... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amphiboles; Stoichiometry; Ferric iron; EPMA. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000300012 |
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| Lauter, Lukas; Hochenauer, Roman; Buchegger, Christoph; Bohn, Marcel; Lengauer, Walter. |
| The solubilities of the most common grain -growth inhibitors (GGIs) Cr, V, Ta, Mo, Nb, Zr and certain combinations there of in the binder phase of WC-Co hardmetals as well as hardmetals of the type WCTiC-TiN-TaC-NbC-Co containing an fcc MC carbide (or carbonitride) phase "MC"("WC-MC-Co" hardmetals) were analysed by means of WDS-EPMA. The carbon potential of the binder phase was fixed at its highest and lowest maxima by the presence of either graphite or eta (M6C) phases. In case of low-carbon hardmetals the composition of M6C, and in the MC-containing hardmetals the composition of the MC phase, was analysed. Two types of solubilities were determined. The first type was measured after controlled cool-down from liquid-phase sintering temperature and... |
| Tipo: Text |
Palavras-chave: Hardmetal; Cemented carbides; Grain-growth inhibitor; Nitrogen; Binder phase; Solubility; EPMA. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00332/44332/44155.pdf |
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