Depleted brittle mica structure determination in Ba-phlogopite glass–ceramics
| Autor: | Susan H. Kilcoyne, David Wood, N. L. Bubb, S. Broady |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Materials science
Scanning electron microscope Mechanical Engineering Energy-dispersive X-ray spectroscopy Crystal structure engineering.material chemistry.chemical_compound Crystallography chemistry Mechanics of Materials Phase (matter) engineering Phlogopite General Materials Science Mica Single crystal EMPA |
| Zdroj: | Journal of Materials Science. 47:5298-5307 |
| ISSN: | 1573-4803 0022-2461 |
| DOI: | 10.1007/s10853-012-6415-1 |
| Popis: | This study concerns the bulk mica phase of a barium phlogopite glass–ceramic, with potential applications in Computer Aided Design and Computer Aided Manufacturing in dentistry, which has been studied in detail and characterized for the first time. A number of analytical techniques including powder X-ray diffraction (XRD), scanning electron microscopy, energy dispersive spectroscopy, electron micro-probe analysis (EMPA), single crystal XRD and Monte-Carlo methods have been used to determine the mica phase composition and crystallographic structure. This has led to the identification of a new species of trioctahedral interlayer deficient brittle mica with an ideal formula of Ba2/3Mg3(Si8/3Al4/3)O10F2. Monte-Carlo simulations of Si/Al cation ordering indicate that the (Si8/3Al4/3) tetrahedral composition is unique and energetically favoured over that of the original assumed mica phase of Ba0.5Mg3(Si3AlO10)F2. The general mica composition X0.5Mg3(Si3Al)O10F2 where X is a divalent interlayer cation; therefore, does not precipitate in brittle mica glass–ceramics. |
| Databáze: | OpenAIRE |
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