β-alumina-14H and β-alumina-21R : two chromic Na2-δ(Al,Mg,Cr)17O25 polysomes observed in slags from the production of low-carbon ferrochromium
| dc.contributor.author | Hejny, Clivia | |
| dc.contributor.author | Kahlenberg, Volker | |
| dc.contributor.author | Schmidmair, Daniela | |
| dc.contributor.author | Tribus, Martina | |
| dc.contributor.author | De Villiers, J.P.R. (Johan) | |
| dc.date.accessioned | 2016-09-22T08:09:42Z | |
| dc.date.issued | 2016-09 | |
| dc.description.abstract | The crystal structures of unknown phases found in slags from the production of low-carbon ferrochromium were studied by powder and single-crystal X-ray diffraction. Two phases of Na2−δ (Al, Mg, Cr)17O25 composition were found to be composed of an alternating stacking of a spinel-type and a Na-hosting block. Similar structures are known for β-alumina and β”- alumina, NaAl11O17. However, the spinel-type block in Na2-δ(Al, Mg, Cr)17O25 is composed of five cation layers in contrast to three cation layers in the β-alumina spinel-block. The two new phases, β-alumina-14H, P63/mmc, a=5.6467(2), c=31.9111(12) Å, and β-alumina-21R, R m, a=5.6515(3), c=48.068(3) Å have a 14-layer and 21-layer stacking with a 2 × (cccccch) and a 3 × (ccccccc) repeat sequence of oxygen layers in cubic and hexagonal close packing, respectively. | en_ZA |
| dc.description.department | Electrical, Electronic and Computer Engineering | en_ZA |
| dc.description.embargo | 2017-09-30 | |
| dc.description.librarian | hb2016 | en_ZA |
| dc.description.uri | http://www.elsevier.com/locate/jssc | en_ZA |
| dc.identifier.citation | Hejny, C, Kahlenberg, V, Schmidmair, D, Tribus, M & De Villiers, JPR 2016, 'β-alumina-14H and β-alumina-21R : two chromic Na2-δ(Al,Mg,Cr)17O25 polysomes observed in slags from the production of low-carbon ferrochromium', Journal of Solid State Chemistry, vol. 241, pp. 70-78. | en_ZA |
| dc.identifier.issn | 0022-4596 | |
| dc.identifier.other | 10.1016/j.jssc.2016.05.038 | |
| dc.identifier.uri | http://hdl.handle.net/2263/56879 | |
| dc.language.iso | en | en_ZA |
| dc.publisher | Elsevier | en_ZA |
| dc.rights | © 2016 Elsevier Inc. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Journal of Solid State Chemistry. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Journal of Solid State Chemistry, vol. 241, pp. 70-78, 2016. doi : 10.1016/j.jssc.2016.05.038. | en_ZA |
| dc.subject | β-alumina | en_ZA |
| dc.subject | Polysome | en_ZA |
| dc.subject | Crystal structure | en_ZA |
| dc.subject.other | Engineering, built environment and information technology articles SDG-07 | |
| dc.subject.other | SDG-07: Affordable and clean energy | |
| dc.subject.other | Engineering, built environment and information technology articles SDG-08 | |
| dc.subject.other | SDG-08: Decent work and economic growth | |
| dc.subject.other | Engineering, built environment and information technology articles SDG-09 | |
| dc.subject.other | SDG-09: Industry, innovation and infrastructure | |
| dc.subject.other | Engineering, built environment and information technology articles SDG-12 | |
| dc.subject.other | SDG-12: Responsible consumption and production | |
| dc.subject.other | Engineering, built environment and information technology articles SDG-13 | |
| dc.subject.other | SDG-13: Climate action | |
| dc.title | β-alumina-14H and β-alumina-21R : two chromic Na2-δ(Al,Mg,Cr)17O25 polysomes observed in slags from the production of low-carbon ferrochromium | en_ZA |
| dc.type | Postprint Article | en_ZA |