دورية أكاديمية
High-pressure synthetic (Na0.97Mg0.03)(Mg0.43Fe0.173+Si0.40)Si2O6, with six-coordinated silicon, isostructural with P2/n omphacite
| العنوان: | High-pressure synthetic (Na0.97Mg0.03)(Mg0.43Fe0.173+Si0.40)Si2O6, with six-coordinated silicon, isostructural with P2/n omphacite |
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| المؤلفون: | Esther S. Posner, Jürgen Konzett, Daniel J. Frost, Robert T. Downs, Hexiong Yang |
| المصدر: | Acta Crystallographica Section E, Vol 68, Iss 2, Pp i18-i18 (2012) |
| بيانات النشر: | International Union of Crystallography, 2012. |
| سنة النشر: | 2012 |
| المجموعة: | LCC:Crystallography |
| مصطلحات موضوعية: | Crystallography, QD901-999 |
| الوصف: | The title compound, (sodium magnesium) [magnesium iron(III) silicon] disilicate, (Na0.97Mg0.03)(Mg0.43Fe0.173+Si0.40)Si2O6, is isotypic with ordered P2/n omphacite. Its structure is characterized by single chains of corner-sharing SiO4 tetrahedra, extending along the c axis, which are crosslinked by bands of edge-sharing octahedra (site symmetry 2), statistically occupied by (Mg2+ + Fe3+ + Si4+). Between the bands built up of the octahedra are two non-equivalent highly distorted six-coordinated sites (site symmetry 2), statistically occupied by (Na + Mg). In contrast to omphacites, the great differences in size and charge between Mg2+ and Si4+ result in complete, rather than partial, ordering of Mg and Si into two distinct octahedral sites, whereas Fe3+ is disordered between the two sites. The octahedron filled by (Mg + Fe) is larger and markedly more distorted than that occupied by (Si + Fe). The average (Mg + Fe)—O and (VISi + Fe)—O bond lengths are 2.075 and 1.850 Å, respectively. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 16005368 1600-5368 |
| Relation: | http://scripts.iucr.org/cgi-bin/paper?S1600536812002966; https://doaj.org/toc/1600-5368 |
| DOI: | 10.1107/S1600536812002966 |
| URL الوصول: | https://doaj.org/article/5c4939e0583f4c9e91c0f950060d222c |
| رقم الأكسشن: | edsdoj.5c4939e0583f4c9e91c0f950060d222c |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 16005368 |
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| DOI: | 10.1107/S1600536812002966 |