Journal article
Structure and properties of Na 5 FeSi 4 O 12 crystallized from 5Na 2 O-Fe 2 O 3 -8SiO 2 glass
Acta crystallographica. Section C, Structural chemistry, Vol.74(Pt 12), p.1595
12/01/2018
Handle:
https://hdl.handle.net/2376/109509
PMID: 30516142
Abstract
The phase Na
FeSi
O
[pentasodium iron(III) silicate] crystallizes readily from the Na
O-Fe
O
-SiO
glass system in a relatively large compositional range. However, its crystal structure and properties have not been studied in detail since its discovery in 1930. In this work, the Na
FeSi
O
phase was crystallized from a host glass with 5Na
O·Fe
O
·8SiO
stoichiometry, and both the glass and the crystal were studied. It was found that the Na
FeSi
O
phase crystallizes at ∼720 °C from the glass and melts at ∼830 °C when heated at a rate of 10 °C min
. The crystal structure was solved using single-crystal X-ray diffraction and the refined data are reported for the first time for the Na
FeSi
O
phase. It exhibits trigonal symmetry, space group R-3c, with a = 21.418 and c = 12.2911 Å. The Na atoms located between adjacent structural channels exhibit positional disorder and splitting which was only refined by using low-temperature data collection (150 K). While ∼7% of the total Fe cations occur as Fe
in the glass, four-coordinated Fe
constitutes ∼93% of the total Fe cations. However, iron in the crystal, which exhibits a paramagnetic behavior, is solely present as six-coordinated Fe
. The magnetic and vibrational properties of the glass and crystal are discussed to provide additional insight into the structure.
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Details
- Title
- Structure and properties of Na 5 FeSi 4 O 12 crystallized from 5Na 2 O-Fe 2 O 3 -8SiO 2 glass
- Creators
- Mostafa Ahmadzadeh - School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, USATravis A Olds - School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, USAAlex Scrimshire - Materials and Engineering Research Institute, Sheffield Hallam University, Sheffield S1 1WB, EnglandPaul A Bingham - Materials and Engineering Research Institute, Sheffield Hallam University, Sheffield S1 1WB, EnglandJohn S McCloy - School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, USA
- Publication Details
- Acta crystallographica. Section C, Structural chemistry, Vol.74(Pt 12), p.1595
- Academic Unit
- Mechanical and Materials Engineering, School of
- Publisher
- England
- Identifiers
- 99900547482501842
- Language
- English
- Resource Type
- Journal article