| Autor: |
Wright, Taylor, Prots, Yurii, Valldor, Martin |
| Předmět: |
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| Zdroj: |
Chemistry - A European Journal; 8/1/2016, Vol. 22 Issue 32, p11303-11309, 7p |
| Abstrakt: |
Ba5Fe6+ xS4+ xO8 was synthesized through a solid-state reaction, and pure powders of nominal compositions x=0.44-0.55 were obtained after being rinsed with water. The crystal structures ( P4/ mmm, a=10.13, c=4.03 Å) and sample purities were investigated by powder synchrotron X-ray diffraction and were found to be composed of a tunnel lattice (Ba5Fe6S4O8), built from fused perovskite units and the tunnel filling (Fe xS x). The variable composition, that is, the tunnel filling ( x), causes partially occupied sites as well as crystallographic split positions. Ba5Fe6+ xS4+ xO8 ( x=0.525) is semiconducting and all investigated compositions exhibit magnetic ground states that could be described as either semi-spin-glass-like ( x>0.5) or canted antiferromagnetic ( x<0.5). The spin-glass in x=0.525 exhibits magnetic relaxations that are affected by ageing. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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