AHMADZADEH, M, OLDS, TA, SCRIMSHIRE, Alex, BINGHAM, Paul and MCCLOY, JS (2018). Structure and properties of Na5FeSi4O12 crystallized from 5Na2O–Fe2O3–8SiO2 glass. Acta Crystallographica Section C: Structural Chemistry, 74 (12), 1595-1602.
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Abstract
The phase Na5FeSi4O12 [pentasodium iron(III) silicate] crystallizes readily from the Na2O–Fe2O3–SiO2 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 Na5FeSi4O12 phase was crystallized from a host glass with 5Na2O·Fe2O3·8SiO2 stoichiometry, and both the glass and the crystal were studied. It was found that the Na5FeSi4O12 phase crystallizes at ∼720 °C from the glass and melts at ∼830 °C when heated at a rate of 10 °C min−1. The crystal structure was solved using single-crystal X-ray diffraction and the refined data are reported for the first time for the Na5FeSi4O12 phase. It exhibits trigonal symmetry, space group Rc, 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 Fe2+ in the glass, four-coordinated Fe3+ constitutes ∼93% of the total Fe cations. However, iron in the crystal, which exhibits a paramagnetic behavior, is solely present as six-coordinated Fe3+. The magnetic and vibrational properties of the glass and crystal are discussed to provide additional insight into the structure.
Item Type: | Article |
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Identification Number: | https://doi.org/10.1107/S2053229618014353 |
Page Range: | 1595-1602 |
SWORD Depositor: | Symplectic Elements |
Depositing User: | Symplectic Elements |
Date Deposited: | 14 Dec 2018 11:29 |
Last Modified: | 18 Mar 2021 07:08 |
URI: | https://shura.shu.ac.uk/id/eprint/23487 |
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