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| Home > Publications database > Single Crystals of C12A7 $\mathrm{(Ca_{12}Al_{14}O_{33})}$ Substituted with 1 mol % Iron |
| Journal Article | DESY-2014-02712 |
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2014
ACS Publ.
Washington, DC
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Please use a persistent id in citations: doi:10.1021/cg401823k
Abstract: Single crystals of Ca12Al14O33 (C12A7, mayenite) substituted with 1 mol % Fe were grown by the floating zone technique in an atmosphere of 2% O2/98% N2. The iron substitution leads to an increase of the unit cell parameter by roughly 0.002 Å. Optical spectroscopy reveals an additional broad absorption band at 310 nm for the iron-substituted sample reflecting the yellow color of the crystals. XANES measurements at the Fe–K absorption edge prove the incorporation of Fe3+ on the aluminum sites. Measurements of the magnetic susceptibility resulted in a value of 5.8 μB per iron ion as expected for high-spin Fe3+. C12A7 is known to be a very good oxygen ion conductor at high temperatures. In pure oxygen, the iron substitution leads to a slightly reduced conductivity between approximately 500 and 800 °C, while at higher temperatures, the conductivity is very similar to the pristine material. Under reducing conditions, the slope of log(σ) vs log(p(O2)) of the iron-substituted sample was found to be steeper than that for pure C12A7.
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